Third Party Web

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Data on third party entities and their impact on the web.

This document is a summary of which third party scripts are most responsible for excessive JavaScript execution on the web today.

Table of Contents

1. Goals
2. Methodology
3. npm Module
4. Updates
5. Data
   1. Summary
   2. How to Interpret
   3. Third Parties by Category
      1. Advertising
      2. Analytics
      3. Social
      4. Video
      5. Developer Utilities
      6. Hosting Platforms
      7. Marketing
      8. Customer Success
      9. Content & Publishing
      10. CDNs
      11. Tag Management
      12. Consent Management Provider
      13. Mixed / Other
   4. Third Parties by Total Impact
6. Future Work
7. FAQs
8. Contributing

Goals

1. Quantify the impact of third party scripts on the web.
2. Identify the third party scripts on the web that have the greatest performance cost.
3. Give developers the information they need to make informed decisions about which third parties to include on their sites.
4. Incentivize responsible third party script behavior.
5. Make this information accessible and useful.

Methodology

HTTP Archive is an initiative that tracks how the web is built. Every month, ~4 million sites are crawled with Lighthouse on mobile. Lighthouse breaks down the total script execution time of each page and attributes the execution to a URL. Using BigQuery, this project aggregates the script execution to the origin-level and assigns each origin to the responsible entity.

npm Module

The entity classification data is available as an npm module.

1const {getEntity} = require('third-party-web')
2const entity = getEntity('https://d36mpcpuzc4ztk.cloudfront.net/js/visitor.js')
3console.log(entity)
4//   {
5//     "name": "Freshdesk",
6//     "homepage": "https://freshdesk.com/",
7//     "category": "customer-success",
8//     "domains": ["d36mpcpuzc4ztk.cloudfront.net"]
9//   }

Updates

2024-07-01 dataset

Some third parties use a dynamic subdomain to serve its main script on websites (e.g .domain.com). Some of these subdomain scripts are saved under observed-domains JSON file as results of the sql/all-observed-domains-query.sql query but analyzing http archive database we found a lot that are ignored because of number of occurrences (less than 50 ).

So, we've created a new query to keep observed domains with occurrence below 50 only if its mapped entity (based on entity.js) has a total occurrence (of all its declared domain) greater than 50.

2021-01-01 dataset

Due to a change in HTTPArchive measurement which temporarily disabled site-isolation (out-of-process iframes), all of the third-parties whose work previously took place off the main-thread are now counted on the main thread (and thus appear in our stats). This is most evident in the change to Google-owned properties such as YouTube and Doubleclick whose complete cost are now captured.

2019-05-13 dataset

A shortcoming of the attribution approach has been fixed. Total usage is now reported based on the number of pages in the dataset that use the third-party, not the number of scripts. Correspondingly, all average impact times are now reported per page rather than per script. Previously, a third party could appear to have a lower impact or be more popular simply by splitting their work across multiple files.

Third-parties that performed most of their work from a single script should see little to no impact from this change, but some entities have seen significant ranking movement. Hosting providers that host entire pages are, understandably, the most affected.

Some notable changes below:

Third-Party	Previously (per-script)	Now (per-page)
Beeketing	137 ms	465 ms
Sumo	263 ms	798 ms
Tumblr	324 ms	1499 ms
Yandex APIs	393 ms	1231 ms
Google Ads	402 ms	1285 ms
Wix	972 ms	5393 ms

2019-05-06 dataset

Google Ads clarified that www.googletagservices.com serves more ad scripts than generic tag management, and it has been reclassified accordingly. This has dropped the overall Tag Management share considerably back down to its earlier position.

2019-03-01 dataset

Almost 2,000 entities tracked now across ~3,000+ domains! Huge props to @simonhearne for making this massive increase possible. Tag Managers have now been split out into their own category since they represented such a large percentage of the "Mixed / Other" category.

2019-02-01 dataset

Huge props to WordAds for reducing their impact from ~2.5s to ~200ms on average! A few entities are showing considerably less data this cycle (Media Math, Crazy Egg, DoubleVerify, Bootstrap CDN). Perhaps they've added new CDNs/hostnames that we haven't identified or the basket of sites in HTTPArchive has shifted away from their usage.

Data

Summary

Across top ~4 million sites, ~2700 origins account for ~57% of all script execution time with the top 50 entities already accounting for ~47%. Third party script execution is the majority chunk of the web today, and it's important to make informed choices.

How to Interpret

Each entity has a number of data points available.

1. Usage (Total Number of Occurrences) - how many scripts from their origins were included on pages
2. Total Impact (Total Execution Time) - how many seconds were spent executing their scripts across the web
3. Average Impact (Average Execution Time) - on average, how many milliseconds were spent executing each script
4. Category - what type of script is this

Third Parties by Category

This section breaks down third parties by category. The third parties in each category are ranked from first to last based on the average impact of their scripts. Perhaps the most important comparisons lie here. You always need to pick an analytics provider, but at least you can pick the most well-behaved analytics provider.

Overall Breakdown

Unsurprisingly, ads account for the largest identifiable chunk of third party script execution.

Advertising

These scripts are part of advertising networks, either serving or measuring.

Rank	Name	Usage	Average Impact
1	Bidswitch	68,217	0 ms
2	Beeswax	12,735	0 ms
3	AdGear	42,920	0 ms
4	Tribal Fusion	158,016	1 ms
5	Nativo	35,852	1 ms
6	Crimtan	74,818	1 ms
7	MaxPoint Interactive	23,834	1 ms
8	iPROM	72,099	2 ms
9	TripleLift	4,812	2 ms
10	adKernel	9,621	2 ms
11	Adyoulike	53,190	3 ms
12	Adform	140,125	13 ms
13	GumGum	167,535	21 ms
14	AppNexus	234,133	25 ms
15	Index Exchange	32,324	28 ms
16	Constant Contact	17,528	35 ms
17	33 Across	192,648	52 ms
18	Branch Metrics	8,288	53 ms
19	Sonobi	81,682	57 ms
20	Simpli.fi	16,378	59 ms
21	MailMunch	19,969	71 ms
22	SiteScout	3,401	75 ms
23	DTSCOUT	8,311	78 ms
24	Scorecard Research	54,577	81 ms
25	OpenX	76,561	82 ms
26	Basis	2,623	82 ms
27	Twitter Online Conversion Tracking	73,452	84 ms
28	ActiveCampaign	19,100	84 ms
29	The Trade Desk	25,346	87 ms
30	sovrn	27,306	87 ms
31	StackAdapt	14,912	90 ms
32	BlueCava	5,165	90 ms
33	Affiliate Window	5,414	104 ms
34	Yahoo!	24,800	106 ms
35	Intercept Interactive	21,012	109 ms
36	Rocket Fuel	3,247	110 ms
37	LinkedIn Ads	199,088	115 ms
38	Criteo	213,880	120 ms
39	Bing Ads	117,720	121 ms
40	Quora Ads	10,614	126 ms
41	RTB House AdPilot	13,287	126 ms
42	STINGRAY	9,742	130 ms
43	TVSquared	4,082	134 ms
44	Rakuten Marketing	3,399	136 ms
45	Impact Radius	4,274	143 ms
46	LINE Corporation	26,881	144 ms
47	Crowd Control	101,196	161 ms
48	Yahoo! JAPAN Ads	37,464	166 ms
49	LoopMe	11,752	180 ms
50	ucfunnel ucX	7,945	185 ms
51	Gemius	15,596	190 ms
52	AudienceSearch	46,726	195 ms
53	InMobi	126,087	195 ms
54	Tynt	212,415	196 ms
55	Simplicity Marketing	2,927	198 ms
56	Technorati	27,186	198 ms
57	Smart AdServer	107,812	207 ms
58	ID5 Identity Cloud	119,336	219 ms
59	i-mobile	16,595	223 ms
60	IPONWEB	39,154	228 ms
61	Outbrain	13,287	254 ms
62	Media.net	97,679	256 ms
63	Auto Link Maker	2,479	265 ms
64	AdRiver	4,740	290 ms
65	LiveRamp Privacy Manager	22,295	294 ms
66	Teads	7,565	303 ms
67	Salesforce.com	4,970	325 ms
68	Unbounce	8,808	330 ms
69	Skimbit	86,270	382 ms
70	Adroll	30,782	386 ms
71	fluct	12,890	397 ms
72	Amazon Ads	240,331	411 ms
73	TrafficStars	7,430	462 ms
74	Onfocus	8,836	480 ms
75	VigLink	6,219	590 ms
76	Cxense	3,708	598 ms
77	Supership	17,934	603 ms
78	Yandex Ads	8,488	609 ms
79	Attentive	9,099	610 ms
80	Microad	23,909	612 ms
81	AdScore	4,394	640 ms
82	Taboola	49,191	663 ms
83	Klaviyo	161,289	701 ms
84	LoyaltyLion	4,114	722 ms
85	WordAds	100,449	740 ms
86	Privy	18,961	791 ms
87	LongTail Ad Solutions	5,572	813 ms
88	OptiMonk	10,615	972 ms
89	Geniee	16,354	1037 ms
90	Rubicon Project	270,271	1062 ms
91	Infolinks	5,950	1344 ms
92	Pubmatic	279,418	1495 ms
93	Sizmek	4,307	1551 ms
94	Ad Lightning	3,795	1813 ms
95	MGID	10,437	2115 ms
96	DoubleVerify	19,453	2410 ms
97	Yahoo! Ad Exchange	4,994	2547 ms
98	Google/Doubleclick Ads	1,232,210	2617 ms
99	Integral Ad Science	21,660	4088 ms
100	Mediavine	12,963	4552 ms

Analytics

These scripts measure or track users and their actions. There's a wide range in impact here depending on what's being tracked.

Rank	Name	Usage	Average Impact
1	Mouseflow	6,786	49 ms
2	Pingdom RUM	1,825	58 ms
3	SpeedCurve RUM	5,358	60 ms
4	Roxr Software	12,877	66 ms
5	WordPress Site Stats	128,931	66 ms
6	Smartlook	16,221	85 ms
7	Woopra	1,366	88 ms
8	Movable Ink	4,949	89 ms
9	Snapchat	1,978	90 ms
10	LiveRamp IdentityLink	1,461	97 ms
11	Treasure Data	14,403	98 ms
12	mPulse	30,624	101 ms
13	StatCounter	50,769	107 ms
14	XiTi	8,483	108 ms
15	Polldaddy	2,715	108 ms
16	Google Analytics	4,231,882	117 ms
17	Exponea	1,303	119 ms
18	Conversant	54,802	119 ms
19	Brandmetrics	30,850	120 ms
20	Snowplow	58,566	121 ms
21	Fastly Insights	4,449	122 ms
22	Site24x7 Real User Monitoring	1,007	123 ms
23	CleverTap	1,321	124 ms
24	Fathom Analytics	1,141	127 ms
25	Stamped.io	12,460	134 ms
26	Quantcast	77,646	160 ms
27	Mixpanel	18,817	173 ms
28	Usabilla	1,354	177 ms
29	Marchex	7,390	186 ms
30	Amplitude Mobile Analytics	46,524	187 ms
31	Braze	2,014	198 ms
32	Smart Insight Tracking	1,779	203 ms
33	Chartbeat	6,246	203 ms
34	Parse.ly	5,204	216 ms
35	Matomo	14,345	217 ms
36	Reviews.co.uk	1,883	226 ms
37	Clearbit	4,171	232 ms
38	Baidu Analytics	32,612	237 ms
39	Google Optimize	38,797	240 ms
40	Radar	1,133	257 ms
41	CallTrackingMetrics	7,503	264 ms
42	Trust Pilot	54,942	269 ms
43	CallRail	29,537	274 ms
44	UpSellit	1,013	286 ms
45	Survicate	3,008	310 ms
46	PageSense	6,219	321 ms
47	Nielsen NetRatings SiteCensus	19,525	350 ms
48	etracker	5,626	369 ms
49	Reviews.io	4,516	380 ms
50	Marketo	1,798	403 ms
51	Pendo	12,203	404 ms
52	Segment	27,036	409 ms
53	Okta	3,542	414 ms
54	Heap	12,078	430 ms
55	Evergage	2,491	440 ms
56	Net Reviews	2,442	468 ms
57	TruConversion	1,008	484 ms
58	Bazaarvoice	3,375	493 ms
59	Evidon	2,482	508 ms
60	AB Tasty	3,363	512 ms
61	BowNow	2,410	539 ms
62	Convert Insights	4,385	587 ms
63	Nosto	1,189	592 ms
64	Clerk.io ApS	1,915	625 ms
65	Crazy Egg	43,822	630 ms
66	Feefo.com	2,025	673 ms
67	Qualtrics	7,134	688 ms
68	Hotjar	333,356	724 ms
69	Appcues	2,831	761 ms
70	Lucky Orange	16,442	777 ms
71	Optimizely	15,998	788 ms
72	FullStory	14,687	788 ms
73	VWO	7,903	821 ms
74	PowerReviews	1,324	913 ms
75	Revolver Maps	2,305	925 ms
76	TrackJS	2,268	931 ms
77	Kameleoon	2,337	949 ms
78	Insider	1,861	1190 ms
79	ContentSquare	2,948	1230 ms
80	Dynatrace	3,221	1275 ms
81	Gigya	1,995	1350 ms
82	Inspectlet	5,346	1426 ms
83	Quantum Metric	1,140	1491 ms
84	Yandex Metrica	602,136	2389 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	Shareaholic	1,429	86 ms
2	Pinterest	131,448	134 ms
3	AddToAny	66,065	161 ms
4	reddit	18,483	223 ms
5	ShareThis	88,829	347 ms
6	Facebook	3,157,799	347 ms
7	LinkedIn	16,507	350 ms
8	TikTok	256,224	434 ms
9	Kakao	62,730	611 ms
10	SocialShopWave	3,720	1334 ms
11	PIXNET	13,718	1352 ms
12	Instagram	20,376	1570 ms
13	Disqus	1,775	2083 ms
14	Twitter	319,957	2514 ms
15	Tumblr	18,114	2516 ms
16	VK	22,377	4082 ms
17	LiveJournal	9,109	6975 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	Brightcove	13,745	1099 ms
2	Vimeo	120,397	2192 ms
3	Wistia	27,059	4277 ms
4	YouTube	977,311	6423 ms
5	Twitch	1,255	14703 ms

Developer Utilities

These scripts are developer utilities (API clients, site monitoring, fraud detection, etc).

Rank	Name	Usage	Average Impact
1	Statuspage	1,212	36 ms
2	Webmarked	1,077	67 ms
3	Rollbar	2,349	81 ms
4	Pusher	1,698	90 ms
5	Raygun	2,539	97 ms
6	iovation	2,159	125 ms
7	Cloudflare	467,719	126 ms
8	CyberSource (Visa)	2,682	126 ms
9	Klarna	10,759	128 ms
10	Ipify	2,753	133 ms
11	Checkout.com	1,367	135 ms
12	Doofinder	12,550	140 ms
13	Macropod BugHerd	3,523	145 ms
14	Braintree Payments	1,141	150 ms
15	Afterpay	8,269	154 ms
16	Amazon Pay	6,833	181 ms
17	Seznam	6,863	193 ms
18	LightWidget	9,383	195 ms
19	Netlify	1,323	226 ms
20	Riskified	1,643	228 ms
21	Highcharts	3,181	235 ms
22	Wufoo	1,507	253 ms
23	Cookie-Script.com	58,095	259 ms
24	OneSignal	68,282	260 ms
25	New Relic	227,672	284 ms
26	Foxentry	2,313	328 ms
27	Google reCAPTCHA	25,662	339 ms
28	Cookiebot	187,732	346 ms
29	mParticle	1,029	392 ms
30	TrustArc	5,941	409 ms
31	Bugsnag	15,069	411 ms
32	Trusted Shops	17,267	427 ms
33	Hexton	24,738	437 ms
34	Other Google APIs/SDKs	2,638,940	439 ms
35	Clarity	456,309	458 ms
36	Key CDN	10,025	480 ms
37	GitHub	14,675	486 ms
38	Bold Commerce	9,886	513 ms
39	ThreatMetrix	3,530	539 ms
40	GetSiteControl	3,146	553 ms
41	Sentry	85,598	560 ms
42	Affirm	6,665	600 ms
43	Mapbox	19,555	707 ms
44	iubenda	97,074	720 ms
45	Google Maps	1,195,850	756 ms
46	Klevu Search	1,463	769 ms
47	Yandex APIs	51,601	790 ms
48	GoDaddy	110,342	858 ms
49	AppDynamics	2,920	859 ms
50	Forter	6,930	949 ms
51	Secomapp	2,137	1007 ms
52	PayPal	62,800	1026 ms
53	Vidyard	1,097	1063 ms
54	Stripe	136,440	1219 ms
55	Luigis Box	2,356	1263 ms
56	WisePops	1,950	1349 ms
57	Marker	1,722	1354 ms
58	Signyfyd	2,608	1822 ms
59	Fastly	9,582	2229 ms
60	Adyen	2,363	2681 ms
61	Datacamp	1,181	2797 ms
62	Rambler	15,831	3444 ms
63	POWr	39,716	4823 ms
64	Esri ArcGIS	3,432	6401 ms

Hosting Platforms

These scripts are from web hosting platforms (WordPress, Wix, Squarespace, etc). Note that in this category, this can sometimes be the entirety of script on the page, and so the "impact" rank might be misleading. In the case of WordPress, this just indicates the libraries hosted and served by WordPress not all sites using self-hosted WordPress.

Rank	Name	Usage	Average Impact
1	Blogger	213,326	274 ms
2	Dealer	2,620	333 ms
3	Civic	7,253	388 ms
4	Salesforce Commerce Cloud	4,127	496 ms
5	Global-e	1,314	537 ms
6	WordPress	308,694	716 ms
7	Shopify	338,668	849 ms
8	Ecwid	4,362	861 ms
9	Tilda	70,321	1347 ms
10	Rackspace	2,624	1362 ms
11	Hatena Blog	43,183	2462 ms
12	WebsiteBuilder.com	4,688	4174 ms
13	Squarespace	243,154	4551 ms
14	Wix	458,273	4609 ms
15	Weebly	67,864	6086 ms

Marketing

These scripts are from marketing tools that add popups/newsletters/etc.

Rank	Name	Usage	Average Impact
1	Kargo	1,135	43 ms
2	Podsights	1,140	63 ms
3	Albacross	1,503	67 ms
4	Convertful	1,534	140 ms
5	DemandBase	2,552	154 ms
6	SharpSpring	2,080	304 ms
7	Hello Bar	4,502	341 ms
8	RD Station	21,846	352 ms
9	Listrak	1,045	439 ms
10	OptinMonster	2,346	442 ms
11	Wishpond Technologies	1,691	456 ms
12	Sojern	4,422	472 ms
13	Mailchimp	45,506	474 ms
14	iZooto	2,022	550 ms
15	Hubspot	154,415	597 ms
16	Yotpo	26,094	648 ms
17	PureCars	1,292	750 ms
18	KARTE	1,729	990 ms
19	Beeketing	1,971	1097 ms
20	Judge.me	27,483	1160 ms
21	Sumo	10,901	1513 ms
22	Wunderkind	1,278	1578 ms
23	Bigcommerce	19,595	2335 ms
24	Tray Commerce	14,071	4858 ms
25	Drift	5,515	5472 ms

Customer Success

These scripts are from customer support/marketing providers that offer chat and contact solutions. These scripts are generally heavier in weight.

Rank	Name	Usage	Average Impact
1	Crisp	1,052	32 ms
2	iPerceptions	4,662	134 ms
3	SnapEngage	1,038	142 ms
4	LiveTex	1,911	250 ms
5	WebEngage	2,283	346 ms
6	Pure Chat	3,105	364 ms
7	Tawk.to	111,088	388 ms
8	Help Scout	4,906	446 ms
9	Comm100	1,045	449 ms
10	Smartsupp	21,505	465 ms
11	Jivochat	57,540	637 ms
12	LivePerson	2,544	759 ms
13	Tidio Live Chat	24,598	1081 ms
14	LiveChat	39,034	1260 ms
15	Intercom	35,197	1267 ms
16	ZenDesk	72,537	1471 ms
17	Olark	6,534	1506 ms
18	Dynamic Yield	1,843	1943 ms
19	Freshchat	7,081	3298 ms

Content & Publishing

These scripts are from content providers or publishing-specific affiliate tracking.

Rank	Name	Usage	Average Impact
1	Spotify	10,992	9 ms
2	OpenTable	4,314	96 ms
3	Accuweather	1,477	198 ms
4	Tencent	8,726	260 ms
5	TripAdvisor	2,354	318 ms
6	Embedly	10,836	463 ms
7	Cloudinary	2,129	558 ms
8	Booking.com	2,448	675 ms
9	CPEx	1,104	691 ms
10	Revcontent	1,251	922 ms
11	AMP	66,265	1201 ms
12	issuu	2,714	2066 ms
13	Kaltura Video Platform	1,017	2128 ms
14	SoundCloud	5,859	2712 ms
15	Hotmart	4,554	3374 ms
16	Dailymotion	5,142	10905 ms
17	Medium	17,027	12740 ms

CDNs

These are a mixture of publicly hosted open source libraries (e.g. jQuery) served over different public CDNs and private CDN usage. This category is unique in that the origin may have no responsibility for the performance of what's being served. Note that rank here does not imply one CDN is better than the other. It simply indicates that the scripts being served from that origin are lighter/heavier than the ones served by another.

Rank	Name	Usage	Average Impact
1	Google Fonts	220,864	0 ms
2	Bootstrap CDN	38,731	54 ms
3	Fort Awesome	3,635	179 ms
4	Microsoft Hosted Libs	20,042	228 ms
5	Monotype	3,185	229 ms
6	FontAwesome CDN	291,586	250 ms
7	jQuery CDN	724,477	417 ms
8	Akamai	9,820	488 ms
9	Cloudflare CDN	666,628	507 ms
10	JSDelivr CDN	399,959	651 ms
11	Adobe TypeKit	119,621	660 ms
12	Azure Web Services	51,378	694 ms
13	Google CDN	3,192,326	1505 ms
14	CreateJS CDN	3,880	3519 ms

Tag Management

These scripts tend to load lots of other scripts and initiate many tasks.

Rank	Name	Usage	Average Impact
1	Adobe Tag Manager	200,160	175 ms
2	Tealium	75,434	267 ms
3	TagCommander	1,509	297 ms
4	Ensighten	3,199	555 ms
5	Google Tag Manager	8,124,119	833 ms

Consent Management Provider

IAB Consent Management Providers are the 'Cookie Consent' popups used by many publishers. They're invoked for every page and sit on the critical path between a page loading and adverts being displayed.

Rank	Name	Usage	Average Impact
1	Trustcommander	1,713	190 ms
2	Optanon	113,700	486 ms
3	UniConsent CMP	1,336	621 ms
4	Google FundingChoices	400,016	644 ms
5	Didomi	84,206	1011 ms
6	Usercentrics CMP	49,602	1069 ms

Mixed / Other

These are miscellaneous scripts delivered via a shared origin with no precise category or attribution. Help us out by identifying more origins!

Rank	Name	Usage	Average Impact
1	ReadSpeaker	6,265	116 ms
2	ResponsiveVoice	6,863	124 ms
3	Browsealoud	1,951	341 ms
4	Amazon Web Services	119,152	436 ms
5	Sirv	1,034	584 ms
6	Heroku	14,119	893 ms
7	Calendly	4,604	1873 ms

Third Parties by Total Impact

This section highlights the entities responsible for the most script execution across the web. This helps inform which improvements would have the largest total impact.

Name	Popularity	Total Impact	Average Impact
Google Tag Manager	8,124,119	6,770,913 s	833 ms
YouTube	977,311	6,277,580 s	6423 ms
Google CDN	3,192,326	4,805,631 s	1505 ms
Google/Doubleclick Ads	1,232,210	3,224,312 s	2617 ms
Wix	458,273	2,112,269 s	4609 ms
Yandex Metrica	602,136	1,438,545 s	2389 ms
Other Google APIs/SDKs	2,638,940	1,158,368 s	439 ms
Squarespace	243,154	1,106,480 s	4551 ms
Facebook	3,157,799	1,097,107 s	347 ms
Google Maps	1,195,850	904,393 s	756 ms
Twitter	319,957	804,233 s	2514 ms
Google Analytics	4,231,882	495,650 s	117 ms
Pubmatic	279,418	417,694 s	1495 ms
Weebly	67,864	413,019 s	6086 ms
Cloudflare CDN	666,628	337,711 s	507 ms
jQuery CDN	724,477	302,334 s	417 ms
Shopify	338,668	287,429 s	849 ms
Rubicon Project	270,271	287,111 s	1062 ms
Vimeo	120,397	263,944 s	2192 ms
JSDelivr CDN	399,959	260,364 s	651 ms
Google FundingChoices	400,016	257,806 s	644 ms
Hotjar	333,356	241,418 s	724 ms
WordPress	308,694	220,911 s	716 ms
Medium	17,027	216,923 s	12740 ms
Clarity	456,309	208,825 s	458 ms
POWr	39,716	191,535 s	4823 ms
Stripe	136,440	166,355 s	1219 ms
Wistia	27,059	115,722 s	4277 ms
Klaviyo	161,289	113,130 s	701 ms
TikTok	256,224	111,182 s	434 ms
ZenDesk	72,537	106,701 s	1471 ms
Hatena Blog	43,183	106,338 s	2462 ms
Amazon Ads	240,331	98,704 s	411 ms
Tilda	70,321	94,734 s	1347 ms
GoDaddy	110,342	94,698 s	858 ms
Hubspot	154,415	92,224 s	597 ms
VK	22,377	91,334 s	4082 ms
Integral Ad Science	21,660	88,554 s	4088 ms
Didomi	84,206	85,132 s	1011 ms
AMP	66,265	79,591 s	1201 ms
Adobe TypeKit	119,621	78,982 s	660 ms
WordAds	100,449	74,286 s	740 ms
FontAwesome CDN	291,586	73,007 s	250 ms
iubenda	97,074	69,911 s	720 ms
Tray Commerce	14,071	68,362 s	4858 ms
Cookiebot	187,732	64,865 s	346 ms
New Relic	227,672	64,593 s	284 ms
PayPal	62,800	64,408 s	1026 ms
LiveJournal	9,109	63,532 s	6975 ms
Mediavine	12,963	59,009 s	4552 ms
Cloudflare	467,719	58,723 s	126 ms
Blogger	213,326	58,390 s	274 ms
Dailymotion	5,142	56,076 s	10905 ms
Optanon	113,700	55,293 s	486 ms
Rambler	15,831	54,521 s	3444 ms
Usercentrics CMP	49,602	53,009 s	1069 ms
Amazon Web Services	119,152	51,892 s	436 ms
LiveChat	39,034	49,171 s	1260 ms
Sentry	85,598	47,937 s	560 ms
DoubleVerify	19,453	46,891 s	2410 ms
Bigcommerce	19,595	45,748 s	2335 ms
Tumblr	18,114	45,571 s	2516 ms
Intercom	35,197	44,601 s	1267 ms
Tawk.to	111,088	43,075 s	388 ms
Tynt	212,415	41,644 s	196 ms
Yandex APIs	51,601	40,765 s	790 ms
Kakao	62,730	38,351 s	611 ms
Jivochat	57,540	36,664 s	637 ms
Azure Web Services	51,378	35,665 s	694 ms
Adobe Tag Manager	200,160	34,938 s	175 ms
Skimbit	86,270	32,940 s	382 ms
Taboola	49,191	32,632 s	663 ms
Instagram	20,376	31,988 s	1570 ms
Judge.me	27,483	31,887 s	1160 ms
ShareThis	88,829	30,808 s	347 ms
Drift	5,515	30,180 s	5472 ms
Crazy Egg	43,822	27,593 s	630 ms
Tidio Live Chat	24,598	26,585 s	1081 ms
ID5 Identity Cloud	119,336	26,134 s	219 ms
Criteo	213,880	25,625 s	120 ms
Media.net	97,679	24,974 s	256 ms
InMobi	126,087	24,607 s	195 ms
Freshchat	7,081	23,350 s	3298 ms
LinkedIn Ads	199,088	22,806 s	115 ms
Smart AdServer	107,812	22,357 s	207 ms
MGID	10,437	22,074 s	2115 ms
Esri ArcGIS	3,432	21,968 s	6401 ms
Mailchimp	45,506	21,592 s	474 ms
Fastly	9,582	21,362 s	2229 ms
Tealium	75,434	20,177 s	267 ms
WebsiteBuilder.com	4,688	19,568 s	4174 ms
PIXNET	13,718	18,541 s	1352 ms
Twitch	1,255	18,453 s	14703 ms
OneSignal	68,282	17,761 s	260 ms
Pinterest	131,448	17,602 s	134 ms
Geniee	16,354	16,956 s	1037 ms
Yotpo	26,094	16,919 s	648 ms
Sumo	10,901	16,490 s	1513 ms
Crowd Control	101,196	16,299 s	161 ms
SoundCloud	5,859	15,889 s	2712 ms
Hotmart	4,554	15,363 s	3374 ms
Brightcove	13,745	15,100 s	1099 ms
Cookie-Script.com	58,095	15,052 s	259 ms
Privy	18,961	14,993 s	791 ms
Trust Pilot	54,942	14,795 s	269 ms
Microad	23,909	14,627 s	612 ms
Bing Ads	117,720	14,227 s	121 ms
Mapbox	19,555	13,816 s	707 ms
CreateJS CDN	3,880	13,654 s	3519 ms
Lucky Orange	16,442	12,779 s	777 ms
Yahoo! Ad Exchange	4,994	12,721 s	2547 ms
Heroku	14,119	12,603 s	893 ms
Optimizely	15,998	12,600 s	788 ms
Quantcast	77,646	12,419 s	160 ms
Adroll	30,782	11,884 s	386 ms
FullStory	14,687	11,575 s	788 ms
Segment	27,036	11,055 s	409 ms
Supership	17,934	10,809 s	603 ms
Hexton	24,738	10,807 s	437 ms
AddToAny	66,065	10,606 s	161 ms
OptiMonk	10,615	10,318 s	972 ms
33 Across	192,648	10,002 s	52 ms
Smartsupp	21,505	9,998 s	465 ms
Olark	6,534	9,841 s	1506 ms
Google Optimize	38,797	9,330 s	240 ms
AudienceSearch	46,726	9,115 s	195 ms
IPONWEB	39,154	8,925 s	228 ms
Amplitude Mobile Analytics	46,524	8,704 s	187 ms
Google reCAPTCHA	25,662	8,694 s	339 ms
Calendly	4,604	8,623 s	1873 ms
WordPress Site Stats	128,931	8,574 s	66 ms
CallRail	29,537	8,080 s	274 ms
Infolinks	5,950	7,995 s	1344 ms
Baidu Analytics	32,612	7,739 s	237 ms
RD Station	21,846	7,694 s	352 ms
Inspectlet	5,346	7,622 s	1426 ms
Trusted Shops	17,267	7,374 s	427 ms
GitHub	14,675	7,126 s	486 ms
Snowplow	58,566	7,099 s	121 ms
Ad Lightning	3,795	6,879 s	1813 ms
Nielsen NetRatings SiteCensus	19,525	6,840 s	350 ms
Connatix	1,195	6,751 s	5650 ms
Sizmek	4,307	6,680 s	1551 ms
Forter	6,930	6,579 s	949 ms
LiveRamp Privacy Manager	22,295	6,546 s	294 ms
Conversant	54,802	6,532 s	119 ms
VWO	7,903	6,485 s	821 ms
Adyen	2,363	6,335 s	2681 ms
OpenX	76,561	6,275 s	82 ms
Yahoo! JAPAN Ads	37,464	6,237 s	166 ms
Bugsnag	15,069	6,198 s	411 ms
Twitter Online Conversion Tracking	73,452	6,171 s	84 ms
AppNexus	234,133	5,949 s	25 ms
LinkedIn	16,507	5,777 s	350 ms
issuu	2,714	5,608 s	2066 ms
Attentive	9,099	5,555 s	610 ms
StatCounter	50,769	5,427 s	107 ms
Technorati	27,186	5,383 s	198 ms
Heap	12,078	5,188 s	430 ms
Yandex Ads	8,488	5,172 s	609 ms
fluct	12,890	5,114 s	397 ms
Bold Commerce	9,886	5,073 s	513 ms
Embedly	10,836	5,014 s	463 ms
SocialShopWave	3,720	4,962 s	1334 ms
Pendo	12,203	4,935 s	404 ms
Qualtrics	7,134	4,907 s	688 ms
Key CDN	10,025	4,815 s	480 ms
Akamai	9,820	4,796 s	488 ms
Signyfyd	2,608	4,753 s	1822 ms
Sonobi	81,682	4,682 s	57 ms
Microsoft Hosted Libs	20,042	4,562 s	228 ms
LongTail Ad Solutions	5,572	4,531 s	813 ms
Scorecard Research	54,577	4,399 s	81 ms
Onfocus	8,836	4,241 s	480 ms
reddit	18,483	4,114 s	223 ms
Dynatrace	3,221	4,107 s	1275 ms
Affirm	6,665	3,997 s	600 ms
LINE Corporation	26,881	3,858 s	144 ms
Ecwid	4,362	3,757 s	861 ms
i-mobile	16,595	3,701 s	223 ms
Disqus	1,775	3,697 s	2083 ms
Brandmetrics	30,850	3,690 s	120 ms
VigLink	6,219	3,670 s	590 ms
ContentSquare	2,948	3,627 s	1230 ms
Dynamic Yield	1,843	3,580 s	1943 ms
Rackspace	2,624	3,573 s	1362 ms
GumGum	167,535	3,441 s	21 ms
TrafficStars	7,430	3,435 s	462 ms
Outbrain	13,287	3,374 s	254 ms
Seedtag	1,503	3,343 s	2224 ms
Datacamp	1,181	3,304 s	2797 ms
Mixpanel	18,817	3,251 s	173 ms
Conversion Labs	1,898	3,243 s	1709 ms
Matomo	14,345	3,115 s	217 ms
mPulse	30,624	3,090 s	101 ms
Luigis Box	2,356	2,975 s	1263 ms
LoyaltyLion	4,114	2,972 s	722 ms
Gemius	15,596	2,965 s	190 ms
Unbounce	8,808	2,902 s	330 ms
Civic	7,253	2,816 s	388 ms

Future Work

1. Introduce URL-level data for more fine-grained analysis, i.e. which libraries from Cloudflare/Google CDNs are most expensive.
2. Expand the scope, i.e. include more third parties and have greater entity/category coverage.

FAQs

I don't see entity X in the list. What's up with that?

This can be for one of several reasons:

1. The entity does not have references to their origin on at least 50 pages in the dataset.
2. The entity's origins have not yet been identified. See How can I contribute?

What is "Total Occurences"?

Total Occurrences is the number of pages on which the entity is included.

How is the "Average Impact" determined?

The HTTP Archive dataset includes Lighthouse reports for each URL on mobile. Lighthouse has an audit called "bootup-time" that summarizes the amount of time that each script spent on the main thread. The "Average Impact" for an entity is the total execution time of scripts whose domain matches one of the entity's domains divided by the total number of pages that included the entity.

Average Impact = Total Execution Time / Total Occurrences

How does Lighthouse determine the execution time of each script?

Lighthouse's bootup time audit attempts to attribute all toplevel main-thread tasks to a URL. A main thread task is attributed to the first script URL found in the stack. If you're interested in helping us improve this logic, see Contributing for details.

The data for entity X seems wrong. How can it be corrected?

Verify that the origins in data/entities.js are correct. Most issues will simply be the result of mislabelling of shared origins. If everything checks out, there is likely no further action and the data is valid. If you still believe there's errors, file an issue to discuss futher.

How can I contribute?

Only about 90% of the third party script execution has been assigned to an entity. We could use your help identifying the rest! See Contributing for details.

Contributing

Thanks

A huge thanks to @simonhearne and @soulgalore for their assistance in classifying additional domains!

Updating the Entities

The domain->entity mapping can be found in data/entities.js. Adding a new entity is as simple as adding a new array item with the following form.

1{
2    "name": "Facebook",
3    "homepage": "https://www.facebook.com",
4    "category": "social",
5    "domains": [
6        "*.facebook.com",
7        "*.fbcdn.net"
8    ],
9    "examples": [
10        "www.facebook.com",
11        "connect.facebook.net",
12        "staticxx.facebook.com",
13        "static.xx.fbcdn.net",
14        "m.facebook.com"
15    ]
16}

Updating Attribution Logic

The logic for attribution to individual script URLs can be found in the Lighthouse repo. File an issue over there to discuss further.

Updating the Data

This is now automated! Run yarn start:update-ha-data with a gcp-credentials.json file in the root directory of this project (look at bin/automated-update.js for the steps involved).

Updating this README

This README is auto-generated from the templates lib/ and the computed data. In order to update the charts, you'll need to make sure you have cairo installed locally in addition to yarn install.

1# Install `cairo` and dependencies for node-canvas
2brew install pkg-config cairo pango libpng jpeg giflib
3# Build the requirements in this repo
4yarn build
5# Regenerate the README
6yarn start

Updating the website

The web code is located in www/ directory of this repository. Open a PR to make changes.