third-party-web

Third Party Web

Check out the shiny new web UI https://www.thirdpartyweb.today/

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

• Goals
• Methodology
• npm Module
• Updates
• Data
  • Summary
  • How to Interpret
  • Third Parties by Category
    • Advertising
    • Analytics
    • Social
    • Video
    • Developer Utilities
    • Hosting Platforms
    • Marketing
    • Customer Success
    • Content & Publishing
    • CDNs
    • Tag Management
    • Consent Management Provider
    • Mixed / Other
  • Third Parties by Total Impact
• Future Work
• FAQs
• Contributing

Goals

• Quantify the impact of third party scripts on the web.
• Identify the third party scripts on the web that have the greatest performance cost.
• Give developers the information they need to make informed decisions about which third parties to include on their sites.
• Incentivize responsible third party script behavior.
• 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.

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

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.

• Usage (Total Number of Occurrences) - how many scripts from their origins were included on pages
• Total Impact (Total Execution Time) - how many seconds were spent executing their scripts across the web
• Average Impact (Average Execution Time) - on average, how many milliseconds were spent executing each script
• 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	SPX	19,636	1 ms
2	TripleLift	6,547	2 ms
3	Adyoulike	121,552	9 ms
4	adKernel	103,092	16 ms
5	Yellow Robot	6,295	27 ms
6	Constant Contact	31,324	29 ms
7	GumGum	117,724	29 ms
8	AppNexus	210,382	36 ms
9	Branch Metrics	5,986	47 ms
10	OpenX	120,004	47 ms
11	LINE Corporation	59,343	49 ms
12	Intercept Interactive	18,069	53 ms
13	Intent IQ	17,223	53 ms
14	The Trade Desk	69,682	55 ms
15	Simpli.fi	6,917	57 ms
16	MailMunch	29,789	63 ms
17	Scorecard Research	85,546	70 ms
18	StickyADS.tv	66,501	70 ms
19	ActiveCampaign	26,174	71 ms
20	SiteScout	6,527	74 ms
21	StackAdapt	33,252	75 ms
22	Affiliate Window	12,775	79 ms
23	DTSCOUT	12,716	80 ms
24	Basis	6,609	82 ms
25	33 Across	201,274	86 ms
26	Yahoo!	28,648	88 ms
27	Ozone Project	6,384	93 ms
28	Simplicity Marketing	6,831	101 ms
29	Crowd Control	184,568	101 ms
30	Twitter Online Conversion Tracking	138,550	102 ms
31	Bing Ads	271,638	110 ms
32	Adform	23,362	120 ms
33	LinkedIn Ads	374,046	123 ms
34	TVSquared	6,019	124 ms
35	Rakuten Marketing	6,060	125 ms
36	Media.net	90,612	127 ms
37	i-mobile	29,592	130 ms
38	Yahoo! JAPAN Ads	74,357	133 ms
39	Index Exchange	26,942	133 ms
40	Impact Radius	9,101	141 ms
41	Criteo	343,672	142 ms
42	Adnami	3,557	142 ms
43	Rocket Fuel	3,442	144 ms
44	F@N Communications	4,132	153 ms
45	BlueCava	8,932	154 ms
46	Smart AdServer	85,964	160 ms
47	AdsWizz	3,422	171 ms
48	JuicyAds	4,116	176 ms
49	AudienceSearch	88,066	180 ms
50	sovrn	23,840	188 ms
51	Technorati	5,902	191 ms
52	Gemius	30,091	199 ms
53	IPONWEB	55,156	229 ms
54	AdRiver	10,995	238 ms
55	Outbrain	31,166	248 ms
56	Hybrid	5,716	258 ms
57	Unbounce	11,745	269 ms
58	Auto Link Maker	4,389	270 ms
59	Quora Ads	14,406	274 ms
60	Tynt	173,566	279 ms
61	LiveRamp Privacy Manager	28,620	283 ms
62	Onfocus	89,517	295 ms
63	RTB House AdPilot	23,558	315 ms
64	Adroll	55,422	317 ms
65	Salesforce.com	7,868	318 ms
66	Seedtag	69,750	340 ms
67	Teads	5,890	344 ms
68	Skimbit	8,604	348 ms
69	ID5 Identity Cloud	267,438	350 ms
70	Adocean	3,531	366 ms
71	InMobi	94,393	368 ms
72	TrafficStars	16,770	398 ms
73	Supership	30,217	446 ms
74	VigLink	8,656	475 ms
75	Cxense	5,815	484 ms
76	Attentive	15,643	506 ms
77	fluct	18,527	508 ms
78	Amazon Ads	383,002	564 ms
79	AdScore	8,188	591 ms
80	LoyaltyLion	7,501	716 ms
81	Klaviyo	336,357	774 ms
82	LongTail Ad Solutions	9,740	840 ms
83	STINGRAY	4,038	851 ms
84	Yahoo! Ad Exchange	8,541	920 ms
85	OptiMonk	21,362	926 ms
86	Yandex Ads	14,476	940 ms
87	Pubmatic	320,608	951 ms
88	Taboola	80,955	961 ms
89	Microad	49,683	1015 ms
90	Geniee	17,539	1055 ms
91	Infolinks	17,589	1147 ms
92	Rubicon Project	304,085	1218 ms
93	Integral Ad Science	23,360	1266 ms
94	Ad Lightning	6,546	1314 ms
95	Privy	31,774	1390 ms
96	Google/Doubleclick Ads	2,067,182	1938 ms
97	MGID	19,280	2049 ms
98	DoubleVerify	14,555	2422 ms
99	Connatix	3,511	4109 ms
100	Mediavine	15,666	5883 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	SpeedCurve RUM	10,757	49 ms
2	Mouseflow	14,725	52 ms
3	Movable Ink	7,719	56 ms
4	WordPress Site Stats	165,697	57 ms
5	Snapchat	3,682	64 ms
6	Woopra	1,888	66 ms
7	Quantcast	90,501	67 ms
8	Smartlook	28,298	75 ms
9	Pingdom RUM	1,027	76 ms
10	StatCounter	81,964	83 ms
11	LiveRamp IdentityLink	1,712	92 ms
12	XiTi	19,961	93 ms
13	Google Analytics	5,758,533	94 ms
14	Braze	10,265	94 ms
15	Exponea	2,465	94 ms
16	Ekm Systems	1,053	97 ms
17	mPulse	63,431	98 ms
18	Site24x7 Real User Monitoring	1,324	102 ms
19	AD EBis	1,041	104 ms
20	Treasure Data	24,521	105 ms
21	Snowplow	114,224	109 ms
22	Stamped.io	20,481	110 ms
23	Fathom Analytics	2,257	111 ms
24	Sailthru	2,799	128 ms
25	DotMetrics	2,188	130 ms
26	WebInsight	1,903	142 ms
27	Brandmetrics	47,062	143 ms
28	CleverTap	2,610	146 ms
29	Radar	1,719	149 ms
30	Conversant	69,664	149 ms
31	Polldaddy	1,854	159 ms
32	Parse.ly	8,624	163 ms
33	Usabilla	1,175	169 ms
34	Smart Insight Tracking	3,619	173 ms
35	Marchex	6,641	181 ms
36	Matomo	27,694	184 ms
37	Chartbeat	9,552	189 ms
38	Ezoic	1,420	189 ms
39	Mixpanel	40,844	195 ms
40	OneAll	1,150	195 ms
41	Heap	19,468	209 ms
42	Baidu Analytics	47,331	215 ms
43	CallRail	59,559	221 ms
44	CallTrackingMetrics	15,837	225 ms
45	Amplitude Mobile Analytics	80,759	233 ms
46	Reviews.co.uk	2,753	247 ms
47	Trust Pilot	81,801	258 ms
48	Google Optimize	55,065	260 ms
49	Okta	4,883	264 ms
50	Clearbit	1,260	264 ms
51	SurveyMonkey	2,320	278 ms
52	UpSellit	3,534	282 ms
53	Trialfire	2,223	297 ms
54	etracker	10,408	306 ms
55	PageSense	15,498	314 ms
56	Net Reviews	2,699	329 ms
57	Kampyle	1,346	345 ms
58	Qualtrics	21,015	350 ms
59	Nielsen NetRatings SiteCensus	20,607	357 ms
60	Lucky Orange	53,492	359 ms
61	Segment	45,882	373 ms
62	Marketo	2,804	388 ms
63	Pendo	28,533	391 ms
64	Evergage	5,300	393 ms
65	BowNow	4,776	438 ms
66	Clerk.io ApS	3,545	445 ms
67	Nosto	2,098	475 ms
68	Feefo.com	3,489	492 ms
69	Monetate	1,162	508 ms
70	AB Tasty	5,150	522 ms
71	Evidon	1,849	537 ms
72	Reviews.io	9,308	537 ms
73	Crazy Egg	70,812	551 ms
74	Bazaarvoice	7,829	565 ms
75	Hotjar	558,816	655 ms
76	Appcues	4,817	679 ms
77	Convert Insights	9,133	688 ms
78	Optimizely	33,807	783 ms
79	PowerReviews	2,649	803 ms
80	Kameleoon	3,939	851 ms
81	VWO	12,221	859 ms
82	Insider	3,541	1008 ms
83	Gigya	3,808	1012 ms
84	FullStory	23,521	1024 ms
85	Dynatrace	2,526	1136 ms
86	ContentSquare	18,561	1305 ms
87	Inspectlet	8,380	1313 ms
88	TrackJS	4,443	1358 ms
89	Quantum Metric	2,459	1648 ms
90	Yandex Metrica	1,047,467	2279 ms
91	Decibel Insight	1,139	2373 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	Shareaholic	1,731	81 ms
2	Pinterest	278,720	115 ms
3	AddToAny	145,526	139 ms
4	LinkedIn	33,241	268 ms
5	ShareThis	156,923	295 ms
6	reddit	53,520	388 ms
7	Facebook	5,758,878	408 ms
8	TikTok	407,793	422 ms
9	Twitter	530,914	491 ms
10	Kakao	115,677	829 ms
11	SocialShopWave	3,077	921 ms
12	PIXNET	16,825	1388 ms
13	Instagram	34,184	1444 ms
14	Tumblr	31,081	2463 ms
15	Disqus	16,554	2558 ms
16	LiveJournal	14,805	4687 ms
17	VK	33,615	5550 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	Brightcove	28,096	931 ms
2	Vimeo	173,780	3375 ms
3	Wistia	37,093	3962 ms
4	YouTube	1,338,938	6527 ms
5	Twitch	1,879	16398 ms

Developer Utilities

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

Rank	Name	Usage	Average Impact
1	Statuspage	2,211	26 ms
2	Cludo	2,393	50 ms
3	Webmarked	2,269	60 ms
4	Pusher	3,069	76 ms
5	Rollbar	5,278	86 ms
6	Raygun	4,245	99 ms
7	Cloudflare	1,019,342	100 ms
8	Macropod BugHerd	6,690	109 ms
9	MathJax	1,205	111 ms
10	Afterpay	16,095	121 ms
11	PrintFriendly	1,101	123 ms
12	Webkul	1,857	127 ms
13	Doofinder	26,100	128 ms
14	Ipify	4,339	142 ms
15	Braintree Payments	2,604	155 ms
16	CyberSource (Visa)	3,835	162 ms
17	Amazon Pay	14,574	174 ms
18	LightWidget	11,089	175 ms
19	Wufoo	4,613	191 ms
20	OneSignal	109,764	192 ms
21	mParticle	1,666	194 ms
22	Riskified	3,529	198 ms
23	Netlify	1,781	220 ms
24	Foxentry	4,724	225 ms
25	Seznam	10,151	232 ms
26	Auth0	1,657	253 ms
27	Transifex	1,003	283 ms
28	Sentry	337,077	287 ms
29	New Relic	341,879	289 ms
30	TrustArc	11,119	298 ms
31	Yandex APIs	76,484	309 ms
32	Key CDN	21,579	329 ms
33	Hexton	62,245	338 ms
34	Highcharts	6,139	338 ms
35	Swiftype	1,457	345 ms
36	Clarity	1,144,289	348 ms
37	Cookiebot	359,761	352 ms
38	Bugsnag	37,770	374 ms
39	Other Google APIs/SDKs	5,364,043	397 ms
40	Cookie Reports	1,273	409 ms
41	GitHub	25,503	412 ms
42	Trusted Shops	33,621	423 ms
43	Google reCAPTCHA	84,753	436 ms
44	Cookie-Script.com	162,355	458 ms
45	GetSiteControl	5,749	518 ms
46	FoxyCart	1,330	521 ms
47	Klarna	21,477	538 ms
48	iovation	3,689	539 ms
49	Bold Commerce	13,791	542 ms
50	Accessibe Accessibility Overlay	3,167	595 ms
51	ThreatMetrix	9,931	632 ms
52	Affirm	13,756	653 ms
53	Mapbox	33,978	704 ms
54	iubenda	188,276	765 ms
55	Google Maps	2,104,224	772 ms
56	AppDynamics	3,751	780 ms
57	Klevu Search	2,362	805 ms
58	Secomapp	3,337	843 ms
59	Vidyard	1,905	851 ms
60	Forter	6,321	852 ms
61	PayPal	150,992	895 ms
62	Checkout.com	8,392	899 ms
63	Marker	4,311	920 ms
64	MaxMind	1,584	1054 ms
65	Okas Concepts	1,033	1163 ms
66	WisePops	2,786	1189 ms
67	Fastly	5,399	1198 ms
68	Rambler	23,697	1229 ms
69	Luigis Box	5,363	1352 ms
70	Stripe	381,748	1452 ms
71	GoDaddy	251,808	1526 ms
72	Noibu	1,127	1627 ms
73	Adyen	4,851	1682 ms
74	Signyfyd	5,191	1767 ms
75	Datacamp	2,393	2672 ms
76	POWr	64,221	4248 ms
77	Esri ArcGIS	7,424	7158 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	Ecwid	10,178	349 ms
2	Civic	13,794	358 ms
3	Salesforce Commerce Cloud	7,787	455 ms
4	Dealer	4,457	508 ms
5	WordPress	479,882	536 ms
6	Global-e	2,949	538 ms
7	Blogger	337,997	683 ms
8	Shopify	795,482	895 ms
9	Rackspace	4,436	960 ms
10	Tilda	130,044	1026 ms
11	Typepad	1,322	1062 ms
12	Yottaa	1,297	1199 ms
13	Hatena Blog	83,022	2230 ms
14	WebsiteBuilder.com	7,284	3126 ms
15	Squarespace	482,067	3430 ms
16	Wix	831,435	3498 ms
17	Framer CDN	30,217	5401 ms
18	Weebly	121,154	6261 ms

Marketing

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

Rank	Name	Usage	Average Impact
1	Albacross	2,286	60 ms
2	Podsights	1,627	64 ms
3	SATORI	1,430	73 ms
4	Convertful	2,166	84 ms
5	DemandBase	3,737	173 ms
6	RD Station	37,041	316 ms
7	SharpSpring	2,484	337 ms
8	Hello Bar	6,977	340 ms
9	Wishpond Technologies	2,825	361 ms
10	Listrak	1,989	395 ms
11	Sojern	7,494	445 ms
12	Curalate	1,155	481 ms
13	Mailchimp	79,106	492 ms
14	OptinMonster	3,233	496 ms
15	iZooto	3,485	499 ms
16	PureCars	2,305	503 ms
17	Hubspot	302,513	541 ms
18	Yotpo	51,754	596 ms
19	Judge.me	45,235	900 ms
20	KARTE	3,124	975 ms
21	Beeketing	2,609	1027 ms
22	Sumo	15,796	1398 ms
23	Wunderkind	2,076	1578 ms
24	Bigcommerce	35,814	1588 ms
25	Tray Commerce	26,776	4394 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	1,359	31 ms
2	Provide Support	1,545	65 ms
3	iPerceptions	8,585	124 ms
4	SnapEngage	1,802	130 ms
5	Salesforce Live Agent	1,040	131 ms
6	iAdvize SAS	1,401	284 ms
7	WebEngage	3,111	292 ms
8	LiveHelpNow	1,432	303 ms
9	LiveTex	3,023	318 ms
10	Pure Chat	4,543	321 ms
11	Tawk.to	189,841	396 ms
12	Help Scout	8,992	413 ms
13	Comm100	1,560	448 ms
14	Usersnap	1,858	511 ms
15	Gladly	1,142	559 ms
16	Smartsupp	38,056	581 ms
17	LivePerson	3,666	677 ms
18	Jivochat	83,766	697 ms
19	Ada	1,774	706 ms
20	LiveChat	65,301	946 ms
21	ZenDesk	122,451	1247 ms
22	Intercom	62,181	1294 ms
23	Olark	9,888	1340 ms
24	Dynamic Yield	2,646	1684 ms
25	Freshchat	12,547	2844 ms

Content & Publishing

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

Rank	Name	Usage	Average Impact
1	Spotify	17,469	7 ms
2	Accuweather	1,930	169 ms
3	Flowplayer	1,542	204 ms
4	Indeed	4,896	214 ms
5	Tencent	11,783	268 ms
6	Embedly	16,482	401 ms
7	Freetobook	1,339	407 ms
8	Cloudinary	3,531	440 ms
9	TripAdvisor	2,380	686 ms
10	Revcontent	2,867	895 ms
11	AMP	75,898	919 ms
12	Booking.com	2,098	1039 ms
13	CPEx	1,656	1251 ms
14	OpenTable	8,442	1256 ms
15	Hotmart	2,750	1968 ms
16	issuu	4,119	2737 ms
17	SoundCloud	8,298	2952 ms
18	Kaltura Video Platform	1,510	3444 ms
19	Dailymotion	4,736	6649 ms
20	Medium	13,389	13374 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	243,073	1 ms
2	Bootstrap CDN	57,221	47 ms
3	Fort Awesome	6,591	144 ms
4	Microsoft Hosted Libs	38,147	156 ms
5	Monotype	4,624	192 ms
6	FontAwesome CDN	459,941	241 ms
7	JSPM	2,362	241 ms
8	jQuery CDN	1,308,168	281 ms
9	Akamai	14,765	346 ms
10	Cloudflare CDN	1,256,607	356 ms
11	ESM>CDN	1,170	383 ms
12	JSDelivr CDN	891,496	486 ms
13	Adobe TypeKit	170,770	656 ms
14	Azure Web Services	62,371	689 ms
15	Google CDN	6,032,146	1542 ms
16	CreateJS CDN	5,661	3424 ms

Tag Management

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

Rank	Name	Usage	Average Impact
1	TagCommander	2,591	214 ms
2	Tealium	175,283	250 ms
3	Ensighten	5,943	459 ms
4	Adobe Tag Manager	109,418	597 ms
5	Google Tag Manager	15,145,255	969 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	3,146	182 ms
2	Optanon	276,055	452 ms
3	UniConsent CMP	2,201	575 ms
4	Google FundingChoices	693,942	623 ms
5	Didomi	184,468	713 ms
6	Usercentrics CMP	103,651	917 ms
7	Osano CMP	31,450	1512 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	12,666	93 ms
2	ResponsiveVoice	12,658	105 ms
3	Loqate	1,610	146 ms
4	MyRegistry	1,150	216 ms
5	Amazon Web Services	190,555	294 ms
6	Browsealoud	3,287	407 ms
7	Sirv	1,888	446 ms
8	Marketplace Web Service	1,208	463 ms
9	Heroku	18,407	640 ms
10	Calendly	12,785	2955 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	15,145,255	14,678,999 s	969 ms
Google CDN	6,032,146	9,302,149 s	1542 ms
YouTube	1,338,938	8,739,742 s	6527 ms
Google/Doubleclick Ads	2,067,182	4,007,181 s	1938 ms
Wix	831,435	2,908,678 s	3498 ms
Yandex Metrica	1,047,467	2,387,032 s	2279 ms
Facebook	5,758,878	2,352,323 s	408 ms
Other Google APIs/SDKs	5,364,043	2,129,115 s	397 ms
Squarespace	482,067	1,653,617 s	3430 ms
Google Maps	2,104,224	1,624,790 s	772 ms
Weebly	121,154	758,509 s	6261 ms
Shopify	795,482	711,686 s	895 ms
Vimeo	173,780	586,518 s	3375 ms
Stripe	381,748	554,271 s	1452 ms
Google Analytics	5,758,533	539,774 s	94 ms
Cloudflare CDN	1,256,607	447,413 s	356 ms
JSDelivr CDN	891,496	433,371 s	486 ms
Google FundingChoices	693,942	432,057 s	623 ms
Clarity	1,144,289	398,712 s	348 ms
GoDaddy	251,808	384,155 s	1526 ms
Rubicon Project	304,085	370,272 s	1218 ms
jQuery CDN	1,308,168	367,222 s	281 ms
Hotjar	558,816	366,232 s	655 ms
Pubmatic	320,608	305,033 s	951 ms
POWr	64,221	272,792 s	4248 ms
Twitter	530,914	260,709 s	491 ms
Klaviyo	336,357	260,393 s	774 ms
WordPress	479,882	257,006 s	536 ms
Blogger	337,997	230,933 s	683 ms
Amazon Ads	383,002	215,965 s	564 ms
VK	33,615	186,556 s	5550 ms
Hatena Blog	83,022	185,167 s	2230 ms
Medium	13,389	179,066 s	13374 ms
TikTok	407,793	171,887 s	422 ms
Hubspot	302,513	163,542 s	541 ms
Framer CDN	30,217	163,193 s	5401 ms
ZenDesk	122,451	152,695 s	1247 ms
Wistia	37,093	146,974 s	3962 ms
iubenda	188,276	144,007 s	765 ms
PayPal	150,992	135,094 s	895 ms
Tilda	130,044	133,394 s	1026 ms
Didomi	184,468	131,538 s	713 ms
Cookiebot	359,761	126,470 s	352 ms
Optanon	276,055	124,640 s	452 ms
Tray Commerce	26,776	117,660 s	4394 ms
Adobe TypeKit	170,770	112,094 s	656 ms
FontAwesome CDN	459,941	110,717 s	241 ms
Cloudflare	1,019,342	102,254 s	100 ms
New Relic	341,879	98,689 s	289 ms
Sentry	337,077	96,733 s	287 ms
Kakao	115,677	95,875 s	829 ms
Usercentrics CMP	103,651	95,043 s	917 ms
ID5 Identity Cloud	267,438	93,671 s	350 ms
Mediavine	15,666	92,157 s	5883 ms
Intercom	62,181	80,457 s	1294 ms
Taboola	80,955	77,761 s	961 ms
Tumblr	31,081	76,563 s	2463 ms
Tawk.to	189,841	75,149 s	396 ms
Cookie-Script.com	162,355	74,354 s	458 ms
AMP	75,898	69,731 s	919 ms
LiveJournal	14,805	69,398 s	4687 ms
Adobe Tag Manager	109,418	65,332 s	597 ms
LiveChat	65,301	61,751 s	946 ms
Jivochat	83,766	58,378 s	697 ms
Bigcommerce	35,814	56,879 s	1588 ms
Amazon Web Services	190,555	55,987 s	294 ms
Esri ArcGIS	7,424	53,140 s	7158 ms
Microad	49,683	50,403 s	1015 ms
Instagram	34,184	49,370 s	1444 ms
Criteo	343,672	48,647 s	142 ms
Tynt	173,566	48,345 s	279 ms
Osano CMP	31,450	47,554 s	1512 ms
ShareThis	156,923	46,220 s	295 ms
LinkedIn Ads	374,046	45,922 s	123 ms
Privy	31,774	44,173 s	1390 ms
Tealium	175,283	43,837 s	250 ms
Azure Web Services	62,371	42,970 s	689 ms
Disqus	16,554	42,340 s	2558 ms
Judge.me	45,235	40,700 s	900 ms
MGID	19,280	39,502 s	2049 ms
Crazy Egg	70,812	39,036 s	551 ms
Mailchimp	79,106	38,943 s	492 ms
Calendly	12,785	37,775 s	2955 ms
Google reCAPTCHA	84,753	36,940 s	436 ms
Freshchat	12,547	35,680 s	2844 ms
DoubleVerify	14,555	35,246 s	2422 ms
InMobi	94,393	34,724 s	368 ms
Pinterest	278,720	32,128 s	115 ms
Dailymotion	4,736	31,489 s	6649 ms
Yotpo	51,754	30,822 s	596 ms
Twitch	1,879	30,812 s	16398 ms
Bing Ads	271,638	29,909 s	110 ms
Integral Ad Science	23,360	29,574 s	1266 ms
Rambler	23,697	29,126 s	1229 ms
Optimizely	33,807	26,480 s	783 ms
Onfocus	89,517	26,451 s	295 ms
Brightcove	28,096	26,162 s	931 ms
SoundCloud	8,298	24,498 s	2952 ms
ContentSquare	18,561	24,213 s	1305 ms
FullStory	23,521	24,096 s	1024 ms
Mapbox	33,978	23,913 s	704 ms
Seedtag	69,750	23,745 s	340 ms
Yandex APIs	76,484	23,625 s	309 ms
PIXNET	16,825	23,345 s	1388 ms
WebsiteBuilder.com	7,284	22,773 s	3126 ms
Smartsupp	38,056	22,106 s	581 ms
Sumo	15,796	22,076 s	1398 ms
OneSignal	109,764	21,076 s	192 ms
Trust Pilot	81,801	21,068 s	258 ms
Hexton	62,245	21,034 s	338 ms
reddit	53,520	20,778 s	388 ms
AddToAny	145,526	20,213 s	139 ms
Infolinks	17,589	20,175 s	1147 ms
OptiMonk	21,362	19,771 s	926 ms
CreateJS CDN	5,661	19,382 s	3424 ms
Lucky Orange	53,492	19,207 s	359 ms
Amplitude Mobile Analytics	80,759	18,848 s	233 ms
Crowd Control	184,568	18,678 s	101 ms
Geniee	17,539	18,496 s	1055 ms
Adroll	55,422	17,567 s	317 ms
33 Across	201,274	17,311 s	86 ms
Segment	45,882	17,122 s	373 ms
AudienceSearch	88,066	15,826 s	180 ms
Connatix	3,511	14,428 s	4109 ms
Google Optimize	55,065	14,329 s	260 ms
Trusted Shops	33,621	14,234 s	423 ms
Bugsnag	37,770	14,134 s	374 ms
Twitter Online Conversion Tracking	138,550	14,116 s	102 ms
Smart AdServer	85,964	13,762 s	160 ms
Yandex Ads	14,476	13,612 s	940 ms
Supership	30,217	13,474 s	446 ms
Olark	9,888	13,251 s	1340 ms
CallRail	59,559	13,148 s	221 ms
IPONWEB	55,156	12,634 s	229 ms
Snowplow	114,224	12,487 s	109 ms
Heroku	18,407	11,786 s	640 ms
RD Station	37,041	11,697 s	316 ms
Klarna	21,477	11,555 s	538 ms
Media.net	90,612	11,471 s	127 ms
issuu	4,119	11,272 s	2737 ms
Pendo	28,533	11,150 s	391 ms
Inspectlet	8,380	11,004 s	1313 ms
OpenTable	8,442	10,605 s	1256 ms
VWO	12,221	10,498 s	859 ms
GitHub	25,503	10,497 s	412 ms
Conversant	69,664	10,398 s	149 ms
Baidu Analytics	47,331	10,169 s	215 ms
Yahoo! JAPAN Ads	74,357	9,860 s	133 ms
WordPress Site Stats	165,697	9,521 s	57 ms
fluct	18,527	9,420 s	508 ms
Signyfyd	5,191	9,174 s	1767 ms
Affirm	13,756	8,981 s	653 ms
LinkedIn	33,241	8,906 s	268 ms
Ad Lightning	6,546	8,600 s	1314 ms
LongTail Ad Solutions	9,740	8,186 s	840 ms
Adyen	4,851	8,160 s	1682 ms
LiveRamp Privacy Manager	28,620	8,099 s	283 ms
Mixpanel	40,844	7,958 s	195 ms
Attentive	15,643	7,914 s	506 ms
Yahoo! Ad Exchange	8,541	7,860 s	920 ms
Outbrain	31,166	7,742 s	248 ms
AppNexus	210,382	7,659 s	36 ms
Checkout.com	8,392	7,544 s	899 ms
Bold Commerce	13,791	7,476 s	542 ms
RTB House AdPilot	23,558	7,412 s	315 ms
Nielsen NetRatings SiteCensus	20,607	7,362 s	357 ms
Qualtrics	21,015	7,350 s	350 ms
Luigis Box	5,363	7,251 s	1352 ms
Key CDN	21,579	7,109 s	329 ms
StatCounter	81,964	6,824 s	83 ms
Brandmetrics	47,062	6,715 s	143 ms
TrafficStars	16,770	6,681 s	398 ms
Embedly	16,482	6,614 s	401 ms
Fastly	5,399	6,466 s	1198 ms
Datacamp	2,393	6,394 s	2672 ms
Convert Insights	9,133	6,283 s	688 ms
ThreatMetrix	9,931	6,276 s	632 ms
mPulse	63,431	6,223 s	98 ms
Quantcast	90,501	6,100 s	67 ms
TrackJS	4,443	6,034 s	1358 ms
Gemius	30,091	5,999 s	199 ms
Scorecard Research	85,546	5,993 s	70 ms
Microsoft Hosted Libs	38,147	5,939 s	156 ms
OpenX	120,004	5,691 s	47 ms
Hotmart	2,750	5,412 s	1968 ms
Forter	6,321	5,387 s	852 ms
LoyaltyLion	7,501	5,372 s	716 ms
Kaltura Video Platform	1,510	5,200 s	3444 ms
Matomo	27,694	5,108 s	184 ms
Akamai	14,765	5,104 s	346 ms
Reviews.io	9,308	5,000 s	537 ms
Civic	13,794	4,941 s	358 ms
PageSense	15,498	4,864 s	314 ms
AdScore	8,188	4,836 s	591 ms
StickyADS.tv	66,501	4,661 s	70 ms
sovrn	23,840	4,476 s	188 ms
Dynamic Yield	2,646	4,456 s	1684 ms
Bazaarvoice	7,829	4,420 s	565 ms
Rackspace	4,436	4,259 s	960 ms
VigLink	8,656	4,115 s	475 ms

Future Work

• Introduce URL-level data for more fine-grained analysis, i.e. which libraries from Cloudflare/Google CDNs are most expensive.
• 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:

• The entity does not have references to their origin on at least 50 pages in the dataset.
• 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.

{
    "name": "Facebook",
    "homepage": "https://www.facebook.com",
    "category": "social",
    "domains": [
        "*.facebook.com",
        "*.fbcdn.net"
    ],
    "examples": [
        "www.facebook.com",
        "connect.facebook.net",
        "staticxx.facebook.com",
        "static.xx.fbcdn.net",
        "m.facebook.com"
    ]
}

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.

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

Updating the website

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