The OnPage Lighthouse API is based on Google’s open-source Lighthouse project for measuring the quality of web pages and web apps.
Lighthouse measures the quality of web pages by running a series of individual tests for each specific feature or metric to produce a numeric score and generate a report. It can run audits for performance, accessibility, progressive web apps, SEO, and conformity with best practices. You can find the full list of OnPage Lighthouse API audits in the Lighthouse Audits section. The results of the Lighthouse run will help you to easily strengthen the audited page or web app.
Instead of ‘login’ and ‘password’ use your credentials from https://app.dataforseo.com/api-access
# Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access
login="login"
password="password"
cred="$(printf ${login}:${password} | base64)"
curl --location --request POST "https://api.dataforseo.com/v3/on_page/lighthouse/live/json"
--header "Authorization: Basic ${cred}"
--header "Content-Type: application/json"
--data-raw "[
{
"url": "https://dataforseo.com",
"for_mobile": true,
"tag": "some_string_123"
}
]"
<?php
// You can download this file from here https://cdn.dataforseo.com/v3/examples/php/php_RestClient.zip
require('RestClient.php');
$api_url = 'https://api.dataforseo.com/';
// Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access
$client = new RestClient($api_url, null, 'login', 'password');
$post_array = array();
// example #1 - a simple way to set a task
$post_array[] = array(
"url" => "https://dataforseo.com",
"for_mobile" => true
);
// example #2 - a way to set a task with additional parameters
$post_array[] = array(
"url" => "https://dataforseo.com",
"for_mobile" => true,
"tag" => "some_string_123"
);
// this example has a 2 elements, but in the case of large number of tasks - send up to 100 elements per POST request
if (count($post_array) > 0) {
try {
// POST /v3/on_page/lighthouse/live/json
// the full list of possible parameters is available in documentation
$result = $client->post('/v3/on_page/lighthouse/live/json', $post_array);
print_r($result);
// do something with post result
} catch (RestClientException $e) {
echo "n";
print "HTTP code: {$e->getHttpCode()}n";
print "Error code: {$e->getCode()}n";
print "Message: {$e->getMessage()}n";
print $e->getTraceAsString();
echo "n";
}
}
$client = null;
?>
from random import Random
from client import RestClient
# You can download this file from here https://api.dataforseo.com/v3/_examples/python/_python_Client.zip
client = RestClient("login", "password")
rnd = Random()
post_data = dict()
# example #1 - a simple way to set a task
post_data[rnd.randint(1, 30000000)] = dict(
url="https://dataforseo.com",
for_mobile=True
)
# example #2 - a way to set a task with additional parameters
post_data[rnd.randint(1, 30000000)] = dict(
url="https://dataforseo.com",
for_mobile=True,
tag="some_string_123"
)
# POST /v3/on_page/lighthouse/live/json
# the full list of possible parameters is available in documentation
response = client.post("/v3/on_page/lighthouse/live/json", post_data)
# you can find the full list of the response codes here https://docs.dataforseo.com/v3/appendix/errors
if response["status_code"] == 20000:
print(response)
# do something with result
else:
print("error. Code: %d Message: %s" % (response["status_code"], response["status_message"]))
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
namespace DataForSeoDemos
{
public static partial class Demos
{
public static async Task on_page_lighthouse_live_json()
{
var httpClient = new HttpClient
{
BaseAddress = new Uri("https://api.dataforseo.com/"),
// Instead of 'login' and 'password' use your credentials from https://app.dataforseo.com/api-access
DefaultRequestHeaders = { Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes("login:password"))) }
};
var postData = new List<object>();
// example #1 - a simple way to set a task
postData.Add(new
{
url = "https://dataforseo.com",
for_mobile = true
});
// example #2 - a way to set a task with additional parameters
postData.Add(new
{
url = "https://dataforseo.com",
for_mobile = true
tag = "some_string_123"
});
// POST /v3/on_page/lighthouse/live/json
// the full list of possible parameters is available in documentation
var taskPostResponse = await httpClient.PostAsync("/v3/on_page/lighthouse/live/json", new StringContent(JsonConvert.SerializeObject(postData)));
var result = JsonConvert.DeserializeObject<dynamic>(await taskPostResponse.Content.ReadAsStringAsync());
// you can find the full list of the response codes here https://docs.dataforseo.com/v3/appendix/errors
if (result.status_code == 20000)
{
// do something with result
Console.WriteLine(result);
}
else
Console.WriteLine($"error. Code: {result.status_code} Message: {result.status_message}");
}
}
}
The above command returns JSON structured like this:
{
"version": "0.1.20210713",
"status_code": 20000,
"status_message": "Ok.",
"time": "0.1528 sec.",
"cost": 0,
"tasks_count": 1,
"tasks_error": 0,
"tasks": [
{
"id": "07161333-1535-0317-0000-d8e44549da11",
"status_code": 20000,
"status_message": "Ok.",
"time": "0.0615 sec.",
"cost": 0,
"result_count": 1,
"path": [
"v3",
"on_page",
"lighthouse",
"live",
"json",
"07161333-1535-0317-0000-d8e44549da11"
],
"data": {
"api": "on_page",
"function": "lighthouse",
"url": "https://dataforseo.com",
"for_mobile": false,
"categories": [
"performance"
]
},
"result": [
{
"userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/79.0.3945.0 Safari/537.36",
"environment": {
"networkUserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4420.0 Safari/537.36 Chrome-Lighthouse",
"hostUserAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/79.0.3945.0 Safari/537.36",
"benchmarkIndex": 2074,
"credits": []
},
"lighthouseVersion": "8.1.0",
"fetchTime": "2021-07-16T10:33:48.401Z",
"requestedUrl": "https://dataforseo.com/",
"finalUrl": "https://dataforseo.com/",
"runWarnings": [],
"audits": {
"first-contentful-paint": {
"id": "first-contentful-paint",
"title": "First Contentful Paint",
"description": "First Contentful Paint marks the time at which the first text or image is painted. [Learn more](https://web.dev/first-contentful-paint/).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 439.024,
"numericUnit": "millisecond",
"displayValue": "0.4 s"
},
"largest-contentful-paint": {
"id": "largest-contentful-paint",
"title": "Largest Contentful Paint",
"description": "Largest Contentful Paint marks the time at which the largest text or image is painted. [Learn more](https://web.dev/lighthouse-largest-contentful-paint/)",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 566.434,
"numericUnit": "millisecond",
"displayValue": "0.6 s"
},
"first-meaningful-paint": {
"id": "first-meaningful-paint",
"title": "First Meaningful Paint",
"description": "First Meaningful Paint measures when the primary content of a page is visible. [Learn more](https://web.dev/first-meaningful-paint/).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 439.024,
"numericUnit": "millisecond",
"displayValue": "0.4 s"
},
"speed-index": {
"id": "speed-index",
"title": "Speed Index",
"description": "Speed Index shows how quickly the contents of a page are visibly populated. [Learn more](https://web.dev/speed-index/).",
"score": 0.6,
"scoreDisplayMode": "numeric",
"numericValue": 2049.241019643555,
"numericUnit": "millisecond",
"displayValue": "2.0 s"
},
"screenshot-thumbnails": {
"id": "screenshot-thumbnails",
"title": "Screenshot Thumbnails",
"description": "This is what the load of your site looked like.",
"score": null,
"scoreDisplayMode": "informative",
"details": {
"type": "filmstrip",
"scale": 6048,
"items": [
{
"timing": 605,
"timestamp": 20543290357934,
"data": "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAMCAgMCAgMDAwMEAwMEBQgFBQQEBQoHBwYIDAoMDAsKCwsNDhIQDQ4RDgsLEBYQERMUFRUVDA8XGBYUGBIUFRQBAwQEBQQFCQUFCRQNCw0UFBQUFBQUFBQUFBQUFBQUFBQ"
}
]
}
},
"final-screenshot": {
"id": "final-screenshot",
"title": "Final Screenshot",
"description": "The last screenshot captured of the pageload.",
"score": null,
"scoreDisplayMode": "informative",
"details": {
"type": "screenshot",
"timing": 6049,
"timestamp": 20543295801964,
"data": "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAYEBQYFBAYGBQYHBwYIChAKCgkJChQODwwQFxQYGBcUFhYaHSUfGhsjHBYWICwgIyYnKSopGR8tMC0oMCUoKSj/2wBDAQcHBwoIChMKChMoGhYaKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCj/"
}
},
"total-blocking-time": {
"id": "total-blocking-time",
"title": "Total Blocking Time",
"description": "Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. [Learn more](https://web.dev/lighthouse-total-blocking-time/).",
"score": 0.26,
"scoreDisplayMode": "numeric",
"numericValue": 539.9429999999998,
"numericUnit": "millisecond",
"displayValue": "540 ms"
},
"max-potential-fid": {
"id": "max-potential-fid",
"title": "Max Potential First Input Delay",
"description": "The maximum potential First Input Delay that your users could experience is the duration of the longest task. [Learn more](https://web.dev/lighthouse-max-potential-fid/).",
"score": 0.1,
"scoreDisplayMode": "numeric",
"numericValue": 480,
"numericUnit": "millisecond",
"displayValue": "480 ms"
},
"cumulative-layout-shift": {
"id": "cumulative-layout-shift",
"title": "Cumulative Layout Shift",
"description": "Cumulative Layout Shift measures the movement of visible elements within the viewport. [Learn more](https://web.dev/cls/).",
"score": null,
"scoreDisplayMode": "error",
"errorMessage": "This version of Chrome is too old to support 'Cumulative Layout Shift'. Use a newer version to see full results."
},
"server-response-time": {
"id": "server-response-time",
"title": "Initial server response time was short",
"description": "Keep the server response time for the main document short because all other requests depend on it. [Learn more](https://web.dev/time-to-first-byte/).",
"score": 1,
"scoreDisplayMode": "binary",
"numericValue": 165.678,
"numericUnit": "millisecond",
"displayValue": "Root document took 170 ms",
"details": {
"type": "opportunity",
"headings": [
{
"key": "url",
"valueType": "url",
"label": "URL"
},
{
"key": "responseTime",
"valueType": "timespanMs",
"label": "Time Spent"
}
],
"items": [
{
"url": "https://dataforseo.com/",
"responseTime": 165.678
}
],
"overallSavingsMs": 65.678
}
},
"interactive": {
"id": "interactive",
"title": "Time to Interactive",
"description": "Time to interactive is the amount of time it takes for the page to become fully interactive. [Learn more](https://web.dev/interactive/).",
"score": 0.28,
"scoreDisplayMode": "numeric",
"numericValue": 5898.571999999998,
"numericUnit": "millisecond",
"displayValue": "5.9 s"
},
"user-timings": {
"id": "user-timings",
"title": "User Timing marks and measures",
"description": "Consider instrumenting your app with the User Timing API to measure your app's real-world performance during key user experiences. [Learn more](https://web.dev/user-timings/).",
"score": null,
"scoreDisplayMode": "notApplicable",
"details": {
"type": "table",
"headings": [],
"items": []
}
},
"critical-request-chains": {
"id": "critical-request-chains",
"title": "Avoid chaining critical requests",
"description": "The Critical Request Chains below show you what resources are loaded with a high priority. Consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load. [Learn more](https://web.dev/critical-request-chains/).",
"score": null,
"scoreDisplayMode": "informative",
"displayValue": "31 chains found",
"details": {
"type": "criticalrequestchain",
"chains": {
"D22F4B0109FBBE44AB9DCAC9BEDFEF68": {
"request": {
"url": "https://dataforseo.com/",
"startTime": 20543289.753872,
"endTime": 20543289.974017,
"responseReceivedTime": 20543289.96983,
"transferSize": 27114
},
"children": {
"3910.2": {
"request": {
"url": "https://dataforseo.com/wp-content/plugins/wp-video-lightbox/css/prettyPhoto.css?ver=4.7.21",
"startTime": 20543289.998297,
"endTime": 20543290.016615,
"responseReceivedTime": 20543290.016142998,
"transferSize": 2989
}
},
"3910.3": {
"request": {
"url": "https://dataforseo.com/wp-content/plugins/wp-video-lightbox/wp-video-lightbox.css?ver=4.7.21",
"startTime": 20543289.998603,
"endTime": 20543290.01797,
"responseReceivedTime": 20543290.017673,
"transferSize": 432
}
},
"3910.4": {
"request": {
"url": "https://dataforseo.com/wp-content/plugins/LayerSlider/static/css/layerslider.css?ver=5.6.9",
"startTime": 20543289.998704,
"endTime": 20543290.023076,
"responseReceivedTime": 20543290.022803,
"transferSize": 2698
}
}
}
}
},
"longestChain": {
"duration": 488.56600001454353,
"length": 2,
"transferSize": 63851
}
}
},
"redirects": {
"id": "redirects",
"title": "Avoid multiple page redirects",
"description": "Redirects introduce additional delays before the page can be loaded. [Learn more](https://web.dev/redirects/).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 0,
"numericUnit": "millisecond",
"displayValue": "",
"details": {
"type": "opportunity",
"headings": [],
"items": [],
"overallSavingsMs": 0
}
},
"mainthread-work-breakdown": {
"id": "mainthread-work-breakdown",
"title": "Minimize main-thread work",
"description": "Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. [Learn more](https://web.dev/mainthread-work-breakdown/)",
"score": 0.53,
"scoreDisplayMode": "numeric",
"numericValue": 3846.747999999776,
"numericUnit": "millisecond",
"displayValue": "3.8 s",
"details": {
"type": "table",
"headings": [
{
"key": "groupLabel",
"itemType": "text",
"text": "Category"
},
{
"key": "duration",
"itemType": "ms",
"granularity": 1,
"text": "Time Spent"
}
],
"items": [
{
"group": "scriptEvaluation",
"groupLabel": "Script Evaluation",
"duration": 1849.1519999999603
},
{
"group": "paintCompositeRender",
"groupLabel": "Rendering",
"duration": 887.8589999998175
}
]
}
},
"bootup-time": {
"id": "bootup-time",
"title": "Reduce JavaScript execution time",
"description": "Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. [Learn more](https://web.dev/bootup-time/).",
"score": 0.83,
"scoreDisplayMode": "numeric",
"numericValue": 1675.7479999999982,
"numericUnit": "millisecond",
"displayValue": "1.7 s",
"details": {
"type": "table",
"headings": [
{
"key": "url",
"itemType": "url",
"text": "URL"
},
{
"key": "total",
"granularity": 1,
"itemType": "ms",
"text": "Total CPU Time"
},
{
"key": "scripting",
"granularity": 1,
"itemType": "ms",
"text": "Script Evaluation"
},
{
"key": "scriptParseCompile",
"granularity": 1,
"itemType": "ms",
"text": "Script Parse"
}
],
"items": [
{
"url": "https://dataforseo.com/",
"total": 1175.3439999999991,
"scripting": 41.81699999999997,
"scriptParseCompile": 0.515
},
{
"url": "https://dataforseo.com/wp-content/themes/startit/assets/js/third-party.min.js?ver=4.7.21",
"total": 703.4280000000133,
"scripting": 417.48899999999844,
"scriptParseCompile": 4.242999999999999
},
{
"url": "https://www.googletagmanager.com/gtm.js?id=GTM-576X48",
"total": 496.5759999999999,
"scripting": 490.3219999999999,
"scriptParseCompile": 3.8509999999999978
}
],
"summary": {
"wastedMs": 1675.7479999999982
}
}
},
"uses-rel-preload": {
"id": "uses-rel-preload",
"title": "Preload key requests",
"description": "Consider using `< link rel=preload >` to prioritize fetching resources that are currently requested later in page load. [Learn more](https://web.dev/uses-rel-preload/).",
"score": null,
"scoreDisplayMode": "notApplicable",
"details": {
"type": "opportunity",
"headings": [],
"items": [],
"overallSavingsMs": 0
}
},
"uses-rel-preconnect": {
"id": "uses-rel-preconnect",
"title": "Preconnect to required origins",
"description": "Consider adding `preconnect` or `dns-prefetch` resource hints to establish early connections to important third-party origins. [Learn more](https://web.dev/uses-rel-preconnect/).",
"score": 1,
"scoreDisplayMode": "numeric",
"numericValue": 0,
"numericUnit": "millisecond",
"displayValue": "",
"warnings": [],
"details": {
"type": "opportunity",
"headings": [],
"items": [],
"overallSavingsMs": 0
}
},
"font-display": {
"id": "font-display",
"title": "Ensure text remains visible during webfont load",
"description": "Leverage the font-display CSS feature to ensure text is user-visible while webfonts are loading. [Learn more](https://web.dev/font-display/).",
"score": 0,
"scoreDisplayMode": "binary",
"warnings": [
"Lighthouse was unable to automatically check the `font-display` values for the origin https://js.intercomcdn.com."
],
"details": {
"type": "table",
"headings": [
{
"key": "url",
"itemType": "url",
"text": "URL"
},
{
"key": "wastedMs",
"itemType": "ms",
"text": "Potential Savings"
}
],
"items": [
{
"url": "https://dataforseo.com/wp-content/themes/startit/assets/css/font-awesome/fonts/fontawesome-webfont.woff2?v=4.6.3",
"wastedMs": 36.47699952125549
},
{
"url": "https://dataforseo.com/wp-content/themes/startit/assets/css/simple-line-icons/fonts/Simple-Line-Icons.ttf?-i3a2kk",
"wastedMs": 38.07099908590317
},
{
"url": "https://dataforseo.com/wp-content/themes/startit/assets/css/elegant-icons/fonts/ElegantIcons.woff",
"wastedMs": 38.80000114440918
},
{
"url": "https://dataforseo.com/wp-content/themes/startit/assets/css/ion-icons/fonts/ionicons.ttf?v=2.0.0",
"wastedMs": 38.29899802803993
}
]
}
},
"diagnostics": {
"id": "diagnostics",
"title": "Diagnostics",
"description": "Collection of useful page vitals.",
"score": null,
"scoreDisplayMode": "informative",
"details": {
"type": "debugdata",
"items": [
{
"numRequests": 189,
"numScripts": 81,
"numStylesheets": 27,
"numFonts": 64,
"numTasks": 3212,
"numTasksOver10ms": 40,
"numTasksOver25ms": 18,
"numTasksOver50ms": 12,
"numTasksOver100ms": 3,
"numTasksOver500ms": 0,
"rtt": 7.119,
"throughput": 68559200.39557016,
"maxRtt": 114.82100000000001,
"maxServerLatency": 728.919,
"totalByteWeight": 2902620,
"totalTaskTime": 3846.747999999995,
"mainDocumentTransferSize": 27114
}
]
}
},
"network-requests": {
"id": "network-requests",
"title": "Network Requests",
"description": "Lists the network requests that were made during page load.",
"score": null,
"scoreDisplayMode": "informative",
"details": {
"type": "table",
"headings": [
{
"key": "url",
"itemType": "url",
"text": "URL"
},
{
"key": "protocol",
"itemType": "text",
"text": "Protocol"
},
{
"key": "startTime",
"itemType": "ms",
"granularity": 1,
"text": "Start Time"
},
{
"key": "endTime",
"itemType": "ms",
"granularity": 1,
"text": "End Time"
},
{
"key": "transferSize",
"itemType": "bytes",
"displayUnit": "kb",
"granularity": 1,
"text": "Transfer Size"
},
{
"key": "resourceSize",
"itemType": "bytes",
"displayUnit": "kb",
"granularity": 1,
"text": "Resource Size"
},
{
"key": "statusCode",
"itemType": "text",
"text": "Status Code"
},
{
"key": "mimeType",
"itemType": "text",
"text": "MIME Type"
},
{
"key": "resourceType",
"itemType": "text",
"text": "Resource Type"
}
],
"items": [
{
"url": "https://dataforseo.com/",
"protocol": "h2",
"startTime": 0,
"endTime": 220.14500200748444,
"finished": true,
"transferSize": 27114,
"resourceSize": 190221,
"statusCode": 200,
"mimeType": "text/html",
"resourceType": "Document"
},
{
"url": "https://dataforseo.com/wp-content/plugins/wp-video-lightbox/css/prettyPhoto.css?ver=4.7.21",
"protocol": "h2",
"startTime": 244.4249987602234,
"endTime": 262.7429999411106,
"finished": true,
"transferSize": 2989,
"resourceSize": 19717,
"statusCode": 200,
"mimeType": "text/css",
"resourceType": "Stylesheet"
},
{
"url": "https://dataforseo.com/wp-content/plugins/wp-video-lightbox/wp-video-lightbox.css?ver=4.7.21",
"protocol": "h2",
"startTime": 244.73100155591965,
"endTime": 264.09799978137016,
"finished": true,
"transferSize": 432,
"resourceSize": 914,
"statusCode": 200,
"mimeType": "text/css",
"resourceType": "Stylesheet"
}
]
}
},
"network-rtt": {
"id": "network-rtt",
"title": "Network Round Trip Times",
"description": "Network round trip times (RTT) have a large impact on performance. If the RTT to an origin is high, it's an indication that servers closer to the user could improve performance. [Learn more](https://hpbn.co/primer-on-latency-and-bandwidth/).",
"score": null,
"scoreDisplayMode": "informative",
"numericValue": 114.82100000000001,
"numericUnit": "millisecond",
"displayValue": "110 ms",
"details": {
"type": "table",
"headings": [
{
"key": "origin",
"itemType": "text",
"text": "URL"
},
{
"key": "rtt",
"itemType": "ms",
"granularity": 1,
"text": "Time Spent"
}
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"network-server-latency": {
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"score": null,
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"numericValue": 5899,
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"score": null,
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"timing-budget": {
"id": "timing-budget",
"title": "Timing budget",
"description": "Set a timing budget to help you keep an eye on the performance of your site. Performant sites load fast and respond to user input events quickly. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/budgets).",
"score": null,
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"description": "To set budgets for the quantity and size of page resources, add a budget.json file. [Learn more](https://web.dev/use-lighthouse-for-performance-budgets/).",
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"type": "table",
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"text": "Requests"
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"text": "Transfer Size"
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"title": "Reduce the impact of third-party code",
"description": "Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading. [Learn more](https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/loading-third-party-javascript/).",
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"displayValue": "Third-party code blocked the main thread for 450 ms",
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"key": "transferSize",
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"itemType": "bytes",
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{
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"summary": {
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"third-party-facades": {
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"title": "Some third-party resources can be lazy loaded with a facade",
"description": "Some third-party embeds can be lazy loaded. Consider replacing them with a facade until they are required. [Learn more](https://web.dev/third-party-facades/).",
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"scoreDisplayMode": "binary",
"displayValue": "1 facade alternative available",
"details": {
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"headings": [
{
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"text": "Product"
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"key": "transferSize"
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"text": "Transfer Size"
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{
"key": "blockingTime",
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"subItemsHeading": {
"key": "blockingTime"
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"granularity": 1,
"text": "Main-Thread Blocking Time"
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{
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"largest-contentful-paint-element": {
"id": "largest-contentful-paint-element",
"title": "Largest Contentful Paint element",
"description": "This is the largest contentful element painted within the viewport. [Learn More](https://web.dev/lighthouse-largest-contentful-paint/)",
"score": null,
"scoreDisplayMode": "informative",
"displayValue": "1 element found",
"details": {
"type": "table",
"headings": [
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"text": "Element"
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"items": [
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"id": "layout-shift-elements",
"title": "Avoid large layout shifts",
"description": "These DOM elements contribute most to the CLS of the page.",
"score": null,
"scoreDisplayMode": "notApplicable",
"details": {
"type": "table",
"headings": [],
"items": []
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},
"long-tasks": {
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"title": "Avoid long main-thread tasks",
"description": "Lists the longest tasks on the main thread, useful for identifying worst contributors to input delay. [Learn more](https://web.dev/long-tasks-devtools/)",
"score": null,
"scoreDisplayMode": "informative",
"displayValue": "4 long tasks found",
"details": {
"type": "table",
"headings": [
{
"key": "url",
"itemType": "url",
"text": "URL"
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{
"key": "startTime",
"itemType": "ms",
"granularity": 1,
"text": "Start Time"
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{
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"granularity": 1,
"text": "Duration"
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],
"items": [
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"url": "https://www.googletagmanager.com/gtm.js?id=GTM-576X48",
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"non-composited-animations": {
"id": "non-composited-animations",
"title": "Avoid non-composited animations",
"description": "Animations which are not composited can be janky and increase CLS. [Learn more](https://web.dev/non-composited-animations)",
"score": null,
"scoreDisplayMode": "notApplicable"
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"unsized-images": {
"id": "unsized-images",
"title": "Image elements do not have explicit `width` and `height`",
"description": "Set an explicit width and height on image elements to reduce layout shifts and improve CLS. [Learn more](https://web.dev/optimize-cls/#images-without-dimensions)",
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"details": {
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]
}
},
"preload-lcp-image": {
"id": "preload-lcp-image",
"title": "Preload Largest Contentful Paint image",
"description": "Preload the image used by the LCP element in order to improve your LCP time. [Learn more](https://web.dev/optimize-lcp/#preload-important-resources).",
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"script-treemap-data": {
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"title": "Script Treemap Data",
"description": "Used for treemap app",
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"nodes": [
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{
"name": "https://www.google-analytics.com/plugins/ua/ec.js",
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"uses-long-cache-ttl": {
"id": "uses-long-cache-ttl",
"title": "Serve static assets with an efficient cache policy",
"description": "A long cache lifetime can speed up repeat visits to your page. [Learn more](https://web.dev/uses-long-cache-ttl/).",
"score": 0.1,
"scoreDisplayMode": "numeric",
"numericValue": 616370.2520192428,
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"text": "URL"
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"text": "Cache TTL",
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{
"key": "totalBytes",
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"text": "Transfer Size",
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"granularity": 1
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],
"items": [
{
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"totalBytes": 39618,
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{
"url": "https://s3.amazonaws.com/agilecrm/web-rules-static/responsive/scripts/simple-modal-min.js",
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],
"summary": {
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"total-byte-weight": {
"id": "total-byte-weight",
"title": "Avoid enormous network payloads",
"description": "Large network payloads cost users real money and are highly correlated with long load times. [Learn more](https://web.dev/total-byte-weight/).",
"score": 0.86,
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"numericValue": 2902620,
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"displayValue": "Total size was 2,835 KiB",
"details": {
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"headings": [
{
"key": "url",
"itemType": "url",
"text": "URL"
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{
"key": "totalBytes",
"itemType": "bytes",
"text": "Transfer Size"
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],
"items": [
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{
"url": "https://dataforseo.com/wp-content/themes/startit/assets/css/ion-icons/fonts/ionicons.ttf?v=2.0.0",
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{
"url": "https://dataforseo.com/wp-content/themes/startit/assets/js/third-party.min.js?ver=4.7.21",
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{
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}
},
"offscreen-images": {
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"title": "Defer offscreen images",
"description": "Consider lazy-loading offscreen and hidden images after all critical resources have finished loading to lower time to interactive. [Learn more](https://web.dev/offscreen-images/).",
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},
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"id": "render-blocking-resources",
"title": "Eliminate render-blocking resources",
"description": "Resources are blocking the first paint of your page. Consider delivering critical JS/CSS inline and deferring all non-critical JS/styles. [Learn more](https://web.dev/render-blocking-resources/).",
"score": 0.9,
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"numericValue": 119,
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"displayValue": "Potential savings of 120 ms",
"details": {
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"headings": [
{
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"label": "URL"
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"valueType": "bytes",
"label": "Transfer Size"
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{
"key": "wastedMs",
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],
"items": [
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],
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"title": "Minify CSS",
"description": "Minifying CSS files can reduce network payload sizes. [Learn more](https://web.dev/unminified-css/).",
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"numericUnit": "millisecond",
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},
"unminified-javascript": {
"id": "unminified-javascript",
"title": "Minify JavaScript",
"description": "Minifying JavaScript files can reduce payload sizes and script parse time. [Learn more](https://web.dev/unminified-javascript/).",
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},
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"id": "unused-css-rules",
"title": "Reduce unused CSS",
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"numericValue": 40,
"numericUnit": "millisecond",
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"label": "Transfer Size"
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"items": [
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},
"unused-javascript": {
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"title": "Reduce unused JavaScript",
"description": "Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. [Learn more](https://web.dev/unused-javascript/).",
"score": 0.78,
"scoreDisplayMode": "numeric",
"numericValue": 260,
"numericUnit": "millisecond",
"displayValue": "Potential savings of 554 KiB",
"details": {
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"label": "Potential Savings"
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],
"items": [
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"path": "audits[bootup-time].displayValue"
}
],
"lighthouse-core/lib/i18n/i18n.js | largestContentfulPaintMetric": [
"audits[largest-contentful-paint].title"
],
"lighthouse-core/audits/metrics/largest-contentful-paint.js | description": [
"audits[largest-contentful-paint].description"
],
"lighthouse-core/lib/i18n/i18n.js | firstMeaningfulPaintMetric": [
"audits[first-meaningful-paint].title"
],
"lighthouse-core/audits/metrics/total-blocking-time.js | description": [
"audits[total-blocking-time].description"
],
"lighthouse-core/lib/i18n/i18n.js | ms": [
{
"values": {
"timeInMs": 539.9429999999998
},
"path": "audits[total-blocking-time].displayValue"
},
{
"values": {
"timeInMs": 480
},
"path": "audits[max-potential-fid].displayValue"
},
{
"values": {
"timeInMs": 114.82100000000001
},
"path": "audits[network-rtt].displayValue"
},
{
"values": {
"timeInMs": 728.919
},
"path": "audits[network-server-latency].displayValue"
}
],
"lighthouse-core/lib/i18n/i18n.js | maxPotentialFIDMetric": [
"audits[max-potential-fid].title"
],
"lighthouse-core/audits/metrics/max-potential-fid.js | description": [
"audits[max-potential-fid].description"
],
"lighthouse-core/lib/i18n/i18n.js | cumulativeLayoutShiftMetric": [
"audits[cumulative-layout-shift].title"
],
"lighthouse-core/audits/metrics/cumulative-layout-shift.js | description": [
"audits[cumulative-layout-shift].description"
],
"lighthouse-core/lib/lh-error.js | oldChromeDoesNotSupportFeature": [
{
"values": {
"errorCode": "UNSUPPORTED_OLD_CHROME",
"featureName": "Cumulative Layout Shift"
},
"path": "audits[cumulative-layout-shift].errorMessage"
}
],
"lighthouse-core/audits/server-response-time.js | title": [
"audits[server-response-time].title"
],
"lighthouse-core/audits/server-response-time.js | description": [
"audits[server-response-time].description"
],
"lighthouse-core/audits/server-response-time.js | displayValue": [
{
"values": {
"timeInMs": 165.678
},
"path": "audits[server-response-time].displayValue"
}
],
"lighthouse-core/lib/i18n/i18n.js | columnURL": [
"audits[server-response-time].details.headings[0].label",
"audits[bootup-time].details.headings[0].text",
"audits[font-display].details.headings[0].text",
"audits[network-rtt].details.headings[0].text",
"audits[network-server-latency].details.headings[0].text",
"audits[long-tasks].details.headings[0].text",
"audits[unsized-images].details.headings[1].text",
"audits[uses-long-cache-ttl].details.headings[0].text",
"audits[total-byte-weight].details.headings[0].text",
"audits[render-blocking-resources].details.headings[0].label",
"audits[unused-css-rules].details.headings[0].label",
"audits[unused-javascript].details.headings[0].label",
"audits[uses-text-compression].details.headings[0].label",
"audits[legacy-javascript].details.headings[0].label"
],
"lighthouse-core/lib/i18n/i18n.js | columnTimeSpent": [
"audits[server-response-time].details.headings[1].label",
"audits[mainthread-work-breakdown].details.headings[1].text",
"audits[network-rtt].details.headings[1].text",
"audits[network-server-latency].details.headings[1].text"
],
"lighthouse-core/lib/i18n/i18n.js | interactiveMetric": [
"audits.interactive.title"
],
"lighthouse-core/audits/metrics/interactive.js | description": [
"audits.interactive.description"
],
"lighthouse-core/lib/i18n/i18n.js | columnBlockingTime": [
"audits[third-party-summary].details.headings[2].text",
"audits[third-party-facades].details.headings[2].text"
],
"lighthouse-core/lib/i18n/i18n.js | otherResourcesLabel": [
"audits[third-party-summary].details.items[1].subItems.items[5].url",
"audits[third-party-summary].details.items[3].subItems.items[2].url",
"audits[third-party-summary].details.items[4].subItems.items[2].url",
"audits[third-party-facades].details.items[0].subItems.items[5].url"
],
"lighthouse-core/audits/third-party-facades.js | failureTitle": [
"audits[third-party-facades].title"
],
"lighthouse-core/audits/byte-efficiency/total-byte-weight.js | displayValue": [
{
"values": {
"totalBytes": 2902620
},
"path": "audits[total-byte-weight].displayValue"
}
],
"lighthouse-core/audits/byte-efficiency/offscreen-images.js | title": [
"audits[offscreen-images].title"
],
"lighthouse-core/audits/byte-efficiency/offscreen-images.js | description": [
"audits[offscreen-images].description"
],
"lighthouse-core/audits/byte-efficiency/render-blocking-resources.js | title": [
"audits[render-blocking-resources].title"
],
"lighthouse-core/audits/byte-efficiency/render-blocking-resources.js | description": [
"audits[render-blocking-resources].description"
],
"lighthouse-core/lib/i18n/i18n.js | displayValueMsSavings": [
{
"values": {
"wastedMs": 119
},
"path": "audits[render-blocking-resources].displayValue"
}
],
"lighthouse-core/audits/byte-efficiency/unminified-css.js | title": [
"audits[unminified-css].title"
],
"lighthouse-core/audits/byte-efficiency/unminified-css.js | description": [
"audits[unminified-css].description"
],
"lighthouse-core/audits/byte-efficiency/unminified-javascript.js | title": [
"audits[unminified-javascript].title"
],
"lighthouse-core/audits/byte-efficiency/unminified-javascript.js | description": [
"audits[unminified-javascript].description"
],
"lighthouse-core/audits/byte-efficiency/unused-css-rules.js | title": [
"audits[unused-css-rules].title"
],
"lighthouse-core/audits/byte-efficiency/unused-css-rules.js | description": [
"audits[unused-css-rules].description"
],
"lighthouse-core/lib/i18n/i18n.js | displayValueByteSavings": [
{
"values": {
"wastedBytes": 114253
},
"path": "audits[unused-css-rules].displayValue"
},
{
"values": {
"wastedBytes": 567204
},
"path": "audits[unused-javascript].displayValue"
},
{
"values": {
"wastedBytes": 305330
},
"path": "audits[uses-text-compression].displayValue"
},
{
"values": {
"wastedBytes": 26152
},
"path": "audits[legacy-javascript].displayValue"
}
],
"lighthouse-core/audits/byte-efficiency/unused-javascript.js | title": [
"audits[unused-javascript].title"
],
"lighthouse-core/audits/byte-efficiency/unused-javascript.js | description": [
"audits[unused-javascript].description"
],
"lighthouse-core/audits/byte-efficiency/modern-image-formats.js | title": [
"audits[modern-image-formats].title"
],
"lighthouse-core/audits/dobetterweb/dom-size.js | displayValue": [
{
"values": {
"itemCount": 2464
},
"path": "audits[dom-size].displayValue"
}
],
"lighthouse-core/audits/dobetterweb/dom-size.js | columnStatistic": [
"audits[dom-size].details.headings[0].text"
],
"lighthouse-core/audits/dobetterweb/dom-size.js | columnValue": [
"audits[dom-size].details.headings[2].text"
],
"lighthouse-core/audits/dobetterweb/dom-size.js | statisticDOMElements": [
"audits[dom-size].details.items[0].statistic"
],
"lighthouse-core/audits/dobetterweb/dom-size.js | statisticDOMDepth": [
"audits[dom-size].details.items[1].statistic"
],
"lighthouse-core/audits/dobetterweb/dom-size.js | statisticDOMWidth": [
"audits[dom-size].details.items[2].statistic"
],
"lighthouse-core/audits/dobetterweb/no-document-write.js | title": [
"audits[no-document-write].title"
]
}
},
"stackPacks": [
{
"id": "wordpress",
"title": "WordPress",
"iconDataURL": "data:image/svg+xml,%3Csvg viewBox=\"0 0 122.5 122.5\" xmlns=\"http://www.w3.org/2000/svg\"%3E%3Cg fill=\"%232f3439\"%3E%3Cpath d=\"M8.7 61.3c0 20.8 12.1 38.7 29.6 47.3l-25-68.7c-3 6.5-4.6 13.7-4.6 21.4zM96.7 58.6c0-6.5-2.3-11-4.3-14.5-2.7-4.3-5.2-8-5.2-12.3 0-4.8 3.7-9.3 8.9-9.3h.7a52.4 52.4 0 0 0-79.4 9.9h3.3c5.5 0 14-.6 14-.6 2.9-.2 3.2 4 .4 4.3 0 0-2.9.4-6 .5l19.1 57L59.7 59l-8.2-22.5c-2.8-.1-5.5-.5-5.5-.5-2.8-.1-2.5-4.5.3-4.3 0 0 8.7.7 13.9.7 5.5 0 14-.7 14-.7 2.8-.2 3.2 4 .3 4.3 0 0-2.8.4-6 .5l19 56.5 5.2-17.5c2.3-7.3 4-12.5 4-17z\"/%3E%3Cpath d=\"M62.2 65.9l-15.8 45.8a52.6 52.6 0 0 0 32.3-.9l-.4-.7zM107.4 36a49.6 49.6 0 0 1-3.6 24.2l-16.1 46.5A52.5 52.5 0 0 0 107.4 36z\"/%3E%3Cpath d=\"M61.3 0a61.3 61.3 0 1 0 .1 122.7A61.3 61.3 0 0 0 61.3 0zm0 119.7a58.5 58.5 0 1 1 .1-117 58.5 58.5 0 0 1-.1 117z\"/%3E%3C/g%3E%3C/svg%3E",
"descriptions": {
"unused-css-rules": "Consider reducing, or switching, the number of [WordPress plugins](https://wordpress.org/plugins/) loading unused CSS in your page. To identify plugins that are adding extraneous CSS, try running [code coverage](https://developers.google.com/web/updates/2017/04/devtools-release-notes#coverage) in Chrome DevTools. You can identify the theme/plugin responsible from the URL of the stylesheet. Look out for plugins that have many stylesheets in the list which have a lot of red in code coverage. A plugin should only enqueue a stylesheet if it is actually used on the page.",
"modern-image-formats": "Consider using a [plugin](https://wordpress.org/plugins/search/convert+webp/) or service that will automatically convert your uploaded images to the optimal formats.",
"offscreen-images": "Install a [lazy-load WordPress plugin](https://wordpress.org/plugins/search/lazy+load/) that provides the ability to defer any offscreen images, or switch to a theme that provides that functionality. Also consider using [the AMP plugin](https://wordpress.org/plugins/amp/).",
"total-byte-weight": "Consider showing excerpts in your post lists (e.g. via the more tag), reducing the number of posts shown on a given page, breaking your long posts into multiple pages, or using a plugin to lazy-load comments.",
"render-blocking-resources": "There are a number of WordPress plugins that can help you [inline critical assets](https://wordpress.org/plugins/search/critical+css/) or [defer less important resources](https://wordpress.org/plugins/search/defer+css+javascript/). Beware that optimizations provided by these plugins may break features of your theme or plugins, so you will likely need to make code changes.",
"unminified-css": "A number of [WordPress plugins](https://wordpress.org/plugins/search/minify+css/) can speed up your site by concatenating, minifying, and compressing your styles. You may also want to use a build process to do this minification up-front if possible."
}
}
]
}
]
}
]
}
All POST data should be sent in the JSON format (UTF-8 encoding). Task setting is done using the POST method. When setting a task, you should send all task parameters in the task array of the generic POST array. You can send up to 2000 API calls per minute, with each POST call containing only one task.
The maximum number of simultaneous requests you can send is limited to 30.
Note that if Lighthouse cannot process a website within 120 seconds, the connection will be aborted by timeout.
target URL required field
target page should be specified with its absolute URL (including http:// or https://)
example: https://dataforseo.com/
for_mobile
bool
applies mobile emulation
optional field
if set to true, Lighthouse will use mobile device and screen emulation to test the page against mobile environment
if set to false, the results will be provided for desktop
default value: false
categories
array
categories of Lighthouse audits
optional field
each category is a collection of audits and audit groups that applies weighting and scoring to the section (see official definition)
if you ignore this field, we will return data for all categories unless you specify audits
use this field to get data for specific categories you indicate here
possible values: seo, pwa, performance, best_practices, accessibility
audits
array
Lighthouse audits
optional field
audits are individual tests Lighthouse runs for each specific feature/optimization/metric to produce a numeric score (see official definition)
if you ignore this field, we will return data for all audits
use this field to get data for specific audits you indicate here
note that some audits do not belong to a specific category and are stand-alone page quality measurements
in general, there can be several use cases:
1. if you ignore categories, you can use this field to get data for the specified audits only
for example, if you ignore "categories" and specify "audits": ["metrics/cumulative-layout-shift","metrics/largest-contentful-paint","metrics/total-blocking-time"], you will get data only for these audits
2. if you specify a category, you can use this field to additionally receive audits that do not belong to the category(-ies) you specified
for example, if you specify "categories": ["seo"] and "audits": ["metrics/cumulative-layout-shift","metrics/largest-contentful-paint","metrics/total-blocking-time"], you will get only these audits under “performance” and all audits under “seo”
lighthouse version
optional field
you can obtain the results specific to a certain Lighthouse version by specifying its number
the list of available versions is available through the Lighthouse Versions endpoint
language_name
string
lighthouse language name
optional field
you can receive the list of available languages of the search engine with their language_name by making a separate request to https://api.dataforseo.com/v3/on_page/lighthouse/languages
default value: English
language_code
string
lighthouse language code
optional field
you can receive the list of available languages of the search engine with their language_code by making a separate request to https://api.dataforseo.com/v3/on_page/lighthouse/languages
default value: en
tag
string
user-defined task identifier
optional field the character limit is 255
you can use this parameter to identify the task and match it with the result
you will find the specified tag value in the data object of the response
As a response of the API server, you will receive JSON-encoded data containing a tasks array with the information specific to the set tasks.
Description of the fields in the results array:
Field name
Type
Description
version
string
the current version of the API
status_code
integer
general status code
you can find the full list of the response codes here Note: we strongly recommend designing a necessary system for handling related exceptional or error conditions
status_message
string
general informational message
you can find the full list of general informational messages here
time
string
execution time, seconds
cost
float
total tasks cost, USD
tasks_count
integer
the number of tasks in the tasks array
tasks_error
integer
the number of tasks in the tasks array returned with an error
tasks
array
array of tasks
id
string
task identifier unique task identifier in our system in the UUID format
status_code
integer
status code of the task
generated by DataForSEO; can be within the following range: 10000-60000
you can find the full list of the response codes here
status_message
string
informational message of the task
you can find the full list of general informational messages here
time
string
execution time, seconds
cost
float
cost of the task, USD
result_count
integer
number of elements in the result array
path
array
URL path
data
object
contains the same parameters that you specified when setting a task
result
array
results of Lighthouse audit
this array will include data according to the parameters you specified when setting a task;
all fields and their descriptions are available in the official documentation by this link.
