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

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.

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.

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	MaxPoint Interactive	4,124	0 ms
2	SPX	14,366	1 ms
3	TripleLift	10,506	2 ms
4	Adyoulike	80,147	8 ms
5	Constant Contact	30,877	32 ms
6	GumGum	55,537	35 ms
7	AppNexus	182,686	38 ms
8	TrustX	12,477	52 ms
9	Intercept Interactive	11,232	53 ms
10	FreakOut	3,815	56 ms
11	Simpli.fi	28,215	59 ms
12	ActiveCampaign	32,910	61 ms
13	33 Across	99,190	63 ms
14	Media.net	29,559	63 ms
15	OpenX	104,910	66 ms
16	sovrn	60,361	69 ms
17	LINE Corporation	66,569	70 ms
18	The Trade Desk	72,308	71 ms
19	MailMunch	30,432	71 ms
20	Intent IQ	12,094	77 ms
21	Affiliate Window	14,546	82 ms
22	RTB House AdPilot	25,479	83 ms
23	Scorecard Research	81,502	83 ms
24	Index Exchange	26,702	85 ms
25	SiteScout	6,010	85 ms
26	Drip	3,834	86 ms
27	Yahoo!	34,921	88 ms
28	Ozone Project	11,303	90 ms
29	StackAdapt	38,499	91 ms
30	Basis	6,894	93 ms
31	DTSCOUT	12,411	96 ms
32	Bing Ads	350,501	100 ms
33	Adform	22,762	103 ms
34	Twitter Online Conversion Tracking	131,338	116 ms
35	TVSquared	7,728	117 ms
36	F@N Communications	10,570	124 ms
37	LinkedIn Ads	384,570	133 ms
38	Crowd Control	136,398	138 ms
39	Rakuten Marketing	5,917	142 ms
40	Simplicity Marketing	7,598	145 ms
41	Rocket Fuel	3,819	151 ms
42	AdsWizz	3,348	153 ms
43	Yahoo! JAPAN Ads	83,673	161 ms
44	Gemius	30,525	162 ms
45	Impact Radius	9,488	167 ms
46	BlueCava	8,404	171 ms
47	JuicyAds	4,192	171 ms
48	Criteo	294,063	173 ms
49	Smart AdServer	46,847	174 ms
50	AudienceSearch	96,693	186 ms
51	Outbrain	21,722	186 ms
52	i-mobile	33,261	198 ms
53	Technorati	5,535	208 ms
54	Geniee	15,678	227 ms
55	Quora Ads	7,726	244 ms
56	IPONWEB	50,588	254 ms
57	AdRiver	14,530	272 ms
58	Tynt	143,320	279 ms
59	LiveRamp Privacy Manager	30,276	289 ms
60	Teads	8,645	291 ms
61	Unbounce	10,396	295 ms
62	Auto Link Maker	4,546	303 ms
63	Onfocus	82,034	307 ms
64	Hybrid	4,682	313 ms
65	Supership	32,253	340 ms
66	Adroll	52,763	383 ms
67	Salesforce.com	5,138	384 ms
68	Skimbit	7,189	430 ms
69	ID5 Identity Cloud	210,127	489 ms
70	Seedtag	25,644	500 ms
71	LoopMe	5,473	506 ms
72	Cxense	5,830	517 ms
73	InMobi	76,721	571 ms
74	Attentive	13,372	587 ms
75	VigLink	7,471	590 ms
76	fluct	18,070	607 ms
77	Amazon Ads	259,877	679 ms
78	TrafficStars	16,044	749 ms
79	AdScore	8,346	766 ms
80	LoyaltyLion	7,043	767 ms
81	LongTail Ad Solutions	9,137	871 ms
82	Klaviyo	379,241	886 ms
83	Microad	46,304	1064 ms
84	Taboola	75,793	1139 ms
85	Conversion Labs	3,483	1193 ms
86	Connatix	10,404	1244 ms
87	OptiMonk	21,190	1254 ms
88	Integral Ad Science	16,502	1415 ms
89	Rubicon Project	265,501	1464 ms
90	Infolinks	12,046	1560 ms
91	Privy	28,409	1564 ms
92	Pubmatic	268,195	1569 ms
93	DoubleVerify	8,949	1595 ms
94	Yandex Ads	15,217	1719 ms
95	Google/Doubleclick Ads	1,961,236	1764 ms
96	Ad Lightning	4,099	1936 ms
97	Web Content Assessor	3,604	2206 ms
98	MGID	19,059	2518 ms
99	Yahoo! Ad Exchange	6,818	3401 ms
100	Mediavine	14,004	6337 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	Keen	1,317	38 ms
2	Mouseflow	14,518	52 ms
3	SpeedCurve RUM	10,371	56 ms
4	Fathom Analytics	2,347	59 ms
5	Pingdom RUM	1,791	64 ms
6	Roxr Software	17,840	65 ms
7	WordPress Site Stats	154,885	66 ms
8	Snapchat	4,220	68 ms
9	LiveRamp IdentityLink	1,434	69 ms
10	Smartlook	26,156	78 ms
11	Movable Ink	2,618	79 ms
12	Woopra	1,857	82 ms
13	Quantcast	90,256	86 ms
14	AD EBis	1,800	91 ms
15	Braze	15,611	94 ms
16	Exponea	2,351	101 ms
17	Ezoic	4,889	106 ms
18	XiTi	21,603	107 ms
19	Google Analytics	5,063,984	108 ms
20	mPulse	61,262	108 ms
21	Treasure Data	25,194	117 ms
22	Stamped.io	21,040	121 ms
23	Polldaddy	2,394	123 ms
24	Usabilla	2,430	127 ms
25	DotMetrics	2,137	133 ms
26	Marchex	4,249	137 ms
27	Snowplow	132,597	141 ms
28	Sailthru	2,397	141 ms
29	Site24x7 Real User Monitoring	1,357	147 ms
30	Conversant	39,631	150 ms
31	WebInsight	2,656	169 ms
32	StatCounter	81,629	174 ms
33	CleverTap	2,327	181 ms
34	Brandmetrics	36,552	183 ms
35	Smart Insight Tracking	3,521	192 ms
36	OneAll	1,018	196 ms
37	Parse.ly	7,345	202 ms
38	Matomo	28,520	220 ms
39	Okta	4,962	224 ms
40	Heap	15,953	230 ms
41	Chartbeat	9,472	246 ms
42	CallRail	60,963	255 ms
43	Baidu Analytics	41,491	260 ms
44	Omniconvert	1,003	274 ms
45	Kampyle	1,108	278 ms
46	CallTrackingMetrics	15,854	282 ms
47	Trust Pilot	74,130	295 ms
48	SurveyMonkey	2,333	304 ms
49	Monetate	2,490	307 ms
50	Mixpanel	38,924	319 ms
51	Net Reviews	1,984	326 ms
52	etracker	10,282	343 ms
53	Google Optimize	48,571	360 ms
54	Marketo	3,057	361 ms
55	Lucky Orange	50,509	380 ms
56	PageSense	16,229	382 ms
57	Segment	44,986	383 ms
58	Nielsen NetRatings SiteCensus	14,246	387 ms
59	Trialfire	2,711	389 ms
60	Nosto	2,024	422 ms
61	Evergage	5,531	427 ms
62	Amplitude Mobile Analytics	61,105	428 ms
63	VWO	10,913	465 ms
64	BowNow	4,828	488 ms
65	Pendo	29,161	490 ms
66	Reviews.io	8,042	503 ms
67	AB Tasty	7,116	524 ms
68	UpSellit	3,219	550 ms
69	Feefo.com	3,436	552 ms
70	Appcues	4,970	571 ms
71	Bazaarvoice	8,127	577 ms
72	Clerk.io ApS	3,521	615 ms
73	Inspectlet	7,307	639 ms
74	Qualtrics	14,199	648 ms
75	Reviews.co.uk	2,606	681 ms
76	Evidon	1,475	715 ms
77	Hotjar	504,590	732 ms
78	Crazy Egg	66,686	831 ms
79	Optimizely	25,015	898 ms
80	FullStory	21,307	911 ms
81	PowerReviews	2,121	953 ms
82	Convert Insights	8,385	1045 ms
83	Insider	3,734	1062 ms
84	Gigya	3,546	1184 ms
85	ContentSquare	38,146	1504 ms
86	Kameleoon	3,585	1542 ms
87	Dynatrace	2,906	1576 ms
88	Quantum Metric	2,966	2152 ms
89	TrackJS	3,225	2231 ms
90	Decibel Insight	1,017	2316 ms
91	Yandex Metrica	1,006,546	2423 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	Shareaholic	1,775	92 ms
2	Pinterest	259,146	128 ms
3	AddToAny	150,218	141 ms
4	LinkedIn	30,361	326 ms
5	ShareThis	144,014	360 ms
6	PIXNET	10,383	418 ms
7	Facebook	5,647,056	514 ms
8	Twitter	477,641	534 ms
9	TikTok	437,719	578 ms
10	reddit	65,646	624 ms
11	Kakao	86,604	781 ms
12	SocialShopWave	1,406	978 ms
13	Instagram	54,666	1429 ms
14	Tumblr	24,030	2422 ms
15	Disqus	14,145	2785 ms
16	VK	27,267	4041 ms
17	LiveJournal	15,989	5207 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	Brightcove	26,891	1014 ms
2	Vimeo	182,269	4099 ms
3	Wistia	36,349	5003 ms
4	YouTube	1,300,771	6297 ms
5	Twitch	1,648	19774 ms

Developer Utilities

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

Rank	Name	Usage	Average Impact
1	Statuspage	2,759	26 ms
2	Cloudflare	3,305,625	67 ms
3	Webmarked	2,314	70 ms
4	Pusher	3,517	71 ms
5	Cludo	2,241	97 ms
6	Rollbar	6,078	113 ms
7	MathJax	1,291	114 ms
8	Macropod BugHerd	8,703	116 ms
9	Raygun	4,363	116 ms
10	Webkul	1,769	121 ms
11	Afterpay	14,826	151 ms
12	PrintFriendly	1,076	154 ms
13	Ipify	3,964	155 ms
14	Doofinder	24,553	155 ms
15	Hexton	54,246	163 ms
16	Braintree Payments	2,689	164 ms
17	OneSignal	107,007	185 ms
18	CyberSource (Visa)	3,217	188 ms
19	Amazon Pay	15,402	189 ms
20	LightWidget	10,644	192 ms
21	Foxentry	4,767	200 ms
22	mParticle	1,591	206 ms
23	Sentry	432,164	215 ms
24	Seznam	9,243	217 ms
25	Riskified	3,664	234 ms
26	Netlify	1,726	265 ms
27	G2	1,268	278 ms
28	Auth0	1,573	282 ms
29	Wufoo	4,237	300 ms
30	New Relic	290,714	329 ms
31	TrustArc	11,118	337 ms
32	Key CDN	21,180	350 ms
33	Yandex APIs	79,640	354 ms
34	Highcharts	5,327	358 ms
35	Swiftype	1,315	376 ms
36	Bugsnag	43,386	377 ms
37	Cookiebot	367,484	398 ms
38	Clarity	1,226,624	405 ms
39	Trusted Shops	33,129	430 ms
40	Other Google APIs/SDKs	5,180,657	462 ms
41	Cookie Reports	1,381	483 ms
42	GitHub	28,884	500 ms
43	FoxyCart	1,235	542 ms
44	GetSiteControl	5,242	546 ms
45	Google reCAPTCHA	79,770	570 ms
46	Cookie-Script.com	195,354	578 ms
47	Bold Commerce	12,067	591 ms
48	Klarna	20,368	596 ms
49	Secomapp	4,608	640 ms
50	iovation	3,322	679 ms
51	Accessibe Accessibility Overlay	3,944	680 ms
52	Mapbox	32,325	784 ms
53	AppDynamics	2,330	824 ms
54	Affirm	13,488	854 ms
55	ThreatMetrix	8,252	902 ms
56	Klevu Search	2,126	908 ms
57	Google Maps	2,039,858	914 ms
58	iubenda	202,893	937 ms
59	Vidyard	1,884	954 ms
60	Marker	4,369	1051 ms
61	Checkout.com	7,900	1079 ms
62	PayPal	151,706	1089 ms
63	Rambler	23,636	1137 ms
64	MaxMind	1,236	1211 ms
65	Forter	9,959	1240 ms
66	WisePops	2,457	1246 ms
67	Fastly	2,030	1659 ms
68	GoDaddy	239,631	1681 ms
69	Adyen	5,341	1691 ms
70	Stripe	366,853	1782 ms
71	Noibu	1,153	1790 ms
72	Datacamp	2,443	3169 ms
73	Signyfyd	4,071	3687 ms
74	POWr	59,744	4720 ms
75	Esri ArcGIS	6,710	7264 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	Silktide	1,694	88 ms
2	Ecwid	12,401	284 ms
3	Civic	14,317	508 ms
4	Salesforce Commerce Cloud	7,113	528 ms
5	Global-e	3,128	544 ms
6	WordPress	423,687	574 ms
7	Dealer	4,584	617 ms
8	Blogger	315,132	784 ms
9	Rackspace	4,025	871 ms
10	Shopify	904,653	1117 ms
11	Tilda	130,221	1242 ms
12	Yottaa	1,248	1303 ms
13	Hatena Blog	80,661	2416 ms
14	WebsiteBuilder.com	6,545	3006 ms
15	Squarespace	489,740	3578 ms
16	Wix	836,665	4196 ms
17	Framer CDN	39,379	5788 ms
18	Weebly	115,744	6947 ms

Marketing

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

Rank	Name	Usage	Average Impact
1	SalesLoft	1,294	60 ms
2	Albacross	3,468	64 ms
3	Podsights	1,458	75 ms
4	SATORI	1,394	81 ms
5	Convertful	1,960	101 ms
6	DemandBase	7,540	116 ms
7	Pardot	1,074	119 ms
8	SharpSpring	3,118	244 ms
9	RD Station	33,836	368 ms
10	Wishpond Technologies	2,699	396 ms
11	Hello Bar	5,651	419 ms
12	Listrak	1,651	454 ms
13	Sojern	8,091	466 ms
14	OptinMonster	2,680	473 ms
15	Curalate	1,051	547 ms
16	PureCars	1,387	548 ms
17	iZooto	3,023	602 ms
18	Mailchimp	80,974	627 ms
19	Yotpo	48,498	668 ms
20	Wunderkind	7,171	1018 ms
21	Judge.me	37,537	1021 ms
22	Beeketing	2,278	1151 ms
23	KARTE	3,044	1172 ms
24	Hubspot	313,527	1226 ms
25	Sumo	13,967	1372 ms
26	Bigcommerce	34,904	1801 ms
27	Kargo	3,852	4014 ms
28	Drift	4,339	4394 ms
29	Tray Commerce	25,153	5107 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	1,577	33 ms
2	Provide Support	1,679	71 ms
3	iPerceptions	7,974	143 ms
4	SnapEngage	1,397	154 ms
5	LiveTex	2,786	298 ms
6	Pure Chat	3,863	346 ms
7	WebEngage	3,096	352 ms
8	LiveHelpNow	1,390	353 ms
9	Help Scout	9,087	427 ms
10	iAdvize SAS	1,619	435 ms
11	Tawk.to	176,551	440 ms
12	Usersnap	2,718	544 ms
13	Comm100	1,271	548 ms
14	Gladly	1,135	617 ms
15	Smartsupp	35,566	647 ms
16	LivePerson	3,218	759 ms
17	Ada	1,876	890 ms
18	Jivochat	84,370	994 ms
19	LiveChat	62,860	1116 ms
20	Intercom	58,316	1433 ms
21	Olark	8,448	1470 ms
22	ZenDesk	111,484	2157 ms
23	Freshchat	11,972	3089 ms

Content & Publishing

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

Rank	Name	Usage	Average Impact
1	Spotify	17,956	7 ms
2	Accuweather	1,582	195 ms
3	Indeed	4,424	204 ms
4	Flowplayer	1,395	208 ms
5	Tencent	13,523	240 ms
6	Embedly	15,905	420 ms
7	Cloudinary	3,024	436 ms
8	TripAdvisor	2,672	525 ms
9	AMP	99,603	949 ms
10	Revcontent	4,259	1124 ms
11	OpenTable	10,010	1442 ms
12	Booking.com	1,446	1462 ms
13	CPEx	1,692	1577 ms
14	Hotmart	2,825	1611 ms
15	issuu	3,609	3423 ms
16	Kaltura Video Platform	1,270	3434 ms
17	SoundCloud	7,742	3886 ms
18	Dailymotion	3,642	6891 ms
19	Medium	12,128	7720 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	296,727	1 ms
2	Bootstrap CDN	77,296	46 ms
3	Fort Awesome	7,049	153 ms
4	Microsoft Hosted Libs	36,189	173 ms
5	Monotype	4,123	203 ms
6	Unpkg	2,267	245 ms
7	JSPM	2,765	258 ms
8	FontAwesome CDN	443,783	272 ms
9	jQuery CDN	1,242,364	305 ms
10	Akamai	13,493	332 ms
11	Cloudflare CDN	1,256,794	376 ms
12	JSDelivr CDN	1,035,485	517 ms
13	Adobe TypeKit	205,876	691 ms
14	ESM>CDN	1,965	755 ms
15	Azure Web Services	56,804	772 ms
16	Google CDN	5,820,680	2047 ms
17	CreateJS CDN	5,024	2926 ms
18	Yandex CDN	58,643	3724 ms

Tag Management

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

Rank	Name	Usage	Average Impact
1	TagCommander	2,600	220 ms
2	Tealium	134,480	283 ms
3	Ensighten	6,750	558 ms
4	Adobe Tag Manager	105,342	687 ms
5	Google Tag Manager	15,022,156	1066 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	3,165	194 ms
2	Optanon	272,514	564 ms
3	UniConsent CMP	2,098	596 ms
4	Didomi	134,457	687 ms
5	Google FundingChoices	667,196	763 ms
6	Usercentrics CMP	114,355	1050 ms
7	Osano CMP	34,521	1706 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	ResponsiveVoice	12,440	113 ms
2	ReadSpeaker	13,093	118 ms
3	Loqate	1,707	161 ms
4	Amazon Web Services	229,350	270 ms
5	Browsealoud	3,169	455 ms
6	Sirv	1,845	524 ms
7	Heroku	17,731	775 ms
8	Calendly	13,872	4305 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	15,022,156	16,019,994 s	1066 ms
Google CDN	5,820,680	11,917,719 s	2047 ms
YouTube	1,300,771	8,191,419 s	6297 ms
Wix	836,665	3,510,621 s	4196 ms
Google/Doubleclick Ads	1,961,236	3,459,580 s	1764 ms
Facebook	5,647,056	2,901,179 s	514 ms
Yandex Metrica	1,006,546	2,438,694 s	2423 ms
Other Google APIs/SDKs	5,180,657	2,391,625 s	462 ms
Google Maps	2,039,858	1,865,202 s	914 ms
Squarespace	489,740	1,752,202 s	3578 ms
Shopify	904,653	1,010,756 s	1117 ms
Weebly	115,744	804,129 s	6947 ms
Vimeo	182,269	747,202 s	4099 ms
Stripe	366,853	653,598 s	1782 ms
Google Analytics	5,063,984	545,547 s	108 ms
JSDelivr CDN	1,035,485	535,071 s	517 ms
Google FundingChoices	667,196	509,212 s	763 ms
Clarity	1,226,624	497,230 s	405 ms
Cloudflare CDN	1,256,794	472,372 s	376 ms
Pubmatic	268,195	420,761 s	1569 ms
GoDaddy	239,631	402,755 s	1681 ms
Rubicon Project	265,501	388,576 s	1464 ms
Hubspot	313,527	384,474 s	1226 ms
jQuery CDN	1,242,364	379,421 s	305 ms
Hotjar	504,590	369,578 s	732 ms
Klaviyo	379,241	335,939 s	886 ms
POWr	59,744	282,014 s	4720 ms
Twitter	477,641	254,976 s	534 ms
TikTok	437,719	253,021 s	578 ms
Blogger	315,132	247,159 s	784 ms
WordPress	423,687	243,223 s	574 ms
ZenDesk	111,484	240,516 s	2157 ms
Framer CDN	39,379	227,930 s	5788 ms
Cloudflare	3,305,625	222,739 s	67 ms
Yandex CDN	58,643	218,390 s	3724 ms
Hatena Blog	80,661	194,880 s	2416 ms
iubenda	202,893	190,013 s	937 ms
Wistia	36,349	181,867 s	5003 ms
Amazon Ads	259,877	176,345 s	679 ms
PayPal	151,706	165,154 s	1089 ms
Tilda	130,221	161,732 s	1242 ms
Optanon	272,514	153,673 s	564 ms
Cookiebot	367,484	146,303 s	398 ms
Adobe TypeKit	205,876	142,316 s	691 ms
Tray Commerce	25,153	128,456 s	5107 ms
FontAwesome CDN	443,783	120,831 s	272 ms
Usercentrics CMP	114,355	120,096 s	1050 ms
Cookie-Script.com	195,354	112,895 s	578 ms
VK	27,267	110,175 s	4041 ms
ID5 Identity Cloud	210,127	102,767 s	489 ms
New Relic	290,714	95,651 s	329 ms
AMP	99,603	94,517 s	949 ms
Medium	12,128	93,625 s	7720 ms
Sentry	432,164	92,769 s	215 ms
Didomi	134,457	92,329 s	687 ms
Mediavine	14,004	88,744 s	6337 ms
Taboola	75,793	86,301 s	1139 ms
Jivochat	84,370	83,873 s	994 ms
Intercom	58,316	83,545 s	1433 ms
LiveJournal	15,989	83,256 s	5207 ms
Instagram	54,666	78,110 s	1429 ms
Tawk.to	176,551	77,701 s	440 ms
Adobe Tag Manager	105,342	72,367 s	687 ms
LiveChat	62,860	70,131 s	1116 ms
Kakao	86,604	67,659 s	781 ms
Bigcommerce	34,904	62,849 s	1801 ms
Amazon Web Services	229,350	61,815 s	270 ms
Calendly	13,872	59,721 s	4305 ms
Osano CMP	34,521	58,885 s	1706 ms
Tumblr	24,030	58,206 s	2422 ms
ContentSquare	38,146	57,390 s	1504 ms
Crazy Egg	66,686	55,417 s	831 ms
ShareThis	144,014	51,786 s	360 ms
LinkedIn Ads	384,570	51,210 s	133 ms
Criteo	294,063	50,801 s	173 ms
Mailchimp	80,974	50,745 s	627 ms
Microad	46,304	49,253 s	1064 ms
Esri ArcGIS	6,710	48,743 s	7264 ms
MGID	19,059	47,996 s	2518 ms
Google reCAPTCHA	79,770	45,484 s	570 ms
Privy	28,409	44,444 s	1564 ms
Azure Web Services	56,804	43,828 s	772 ms
InMobi	76,721	43,809 s	571 ms
reddit	65,646	40,944 s	624 ms
Tynt	143,320	39,960 s	279 ms
Disqus	14,145	39,399 s	2785 ms
Judge.me	37,537	38,327 s	1021 ms
Tealium	134,480	38,049 s	283 ms
Freshchat	11,972	36,982 s	3089 ms
Bing Ads	350,501	35,127 s	100 ms
Pinterest	259,146	33,239 s	128 ms
Twitch	1,648	32,587 s	19774 ms
Yotpo	48,498	32,400 s	668 ms
SoundCloud	7,742	30,087 s	3886 ms
Yandex APIs	79,640	28,215 s	354 ms
Brightcove	26,891	27,268 s	1014 ms
Rambler	23,636	26,882 s	1137 ms
OptiMonk	21,190	26,566 s	1254 ms
Amplitude Mobile Analytics	61,105	26,173 s	428 ms
Yandex Ads	15,217	26,151 s	1719 ms
Mapbox	32,325	25,329 s	784 ms
Onfocus	82,034	25,204 s	307 ms
Dailymotion	3,642	25,096 s	6891 ms
Integral Ad Science	16,502	23,348 s	1415 ms
Yahoo! Ad Exchange	6,818	23,188 s	3401 ms
Smartsupp	35,566	23,006 s	647 ms
Optimizely	25,015	22,460 s	898 ms
Trust Pilot	74,130	21,871 s	295 ms
AddToAny	150,218	21,165 s	141 ms
Adroll	52,763	20,214 s	383 ms
OneSignal	107,007	19,828 s	185 ms
WebsiteBuilder.com	6,545	19,675 s	3006 ms
FullStory	21,307	19,404 s	911 ms
Lucky Orange	50,509	19,195 s	380 ms
Sumo	13,967	19,166 s	1372 ms
Drift	4,339	19,064 s	4394 ms
Infolinks	12,046	18,797 s	1560 ms
Crowd Control	136,398	18,796 s	138 ms
Snowplow	132,597	18,648 s	141 ms
AudienceSearch	96,693	17,953 s	186 ms
Google Optimize	48,571	17,505 s	360 ms
Segment	44,986	17,216 s	383 ms
Bugsnag	43,386	16,345 s	377 ms
CallRail	60,963	15,572 s	255 ms
Kargo	3,852	15,460 s	4014 ms
Twitter Online Conversion Tracking	131,338	15,188 s	116 ms
Signyfyd	4,071	15,010 s	3687 ms
CreateJS CDN	5,024	14,701 s	2926 ms
GitHub	28,884	14,451 s	500 ms
OpenTable	10,010	14,435 s	1442 ms
Pendo	29,161	14,276 s	490 ms
DoubleVerify	8,949	14,274 s	1595 ms
Trusted Shops	33,129	14,232 s	430 ms
StatCounter	81,629	14,171 s	174 ms
Heroku	17,731	13,747 s	775 ms
Yahoo! JAPAN Ads	83,673	13,508 s	161 ms
Connatix	10,404	12,942 s	1244 ms
IPONWEB	50,588	12,862 s	254 ms
Seedtag	25,644	12,834 s	500 ms
RD Station	33,836	12,451 s	368 ms
Olark	8,448	12,415 s	1470 ms
Mixpanel	38,924	12,411 s	319 ms
Forter	9,959	12,354 s	1240 ms
issuu	3,609	12,354 s	3423 ms
Klarna	20,368	12,130 s	596 ms
TrafficStars	16,044	12,014 s	749 ms
Affirm	13,488	11,524 s	854 ms
Supership	32,253	10,976 s	340 ms
fluct	18,070	10,966 s	607 ms
Baidu Analytics	41,491	10,798 s	260 ms
WordPress Site Stats	154,885	10,147 s	66 ms
LinkedIn	30,361	9,887 s	326 ms
Qualtrics	14,199	9,197 s	648 ms
Adyen	5,341	9,033 s	1691 ms
Hexton	54,246	8,836 s	163 ms
Convert Insights	8,385	8,766 s	1045 ms
LiveRamp Privacy Manager	30,276	8,742 s	289 ms
Checkout.com	7,900	8,526 s	1079 ms
Smart AdServer	46,847	8,156 s	174 ms
LongTail Ad Solutions	9,137	7,963 s	871 ms
Web Content Assessor	3,604	7,949 s	2206 ms
Ad Lightning	4,099	7,934 s	1936 ms
Attentive	13,372	7,844 s	587 ms
Quantcast	90,256	7,773 s	86 ms
Datacamp	2,443	7,742 s	3169 ms
ThreatMetrix	8,252	7,440 s	902 ms
Key CDN	21,180	7,409 s	350 ms
Wunderkind	7,171	7,303 s	1018 ms
Civic	14,317	7,268 s	508 ms
TrackJS	3,225	7,196 s	2231 ms
Bold Commerce	12,067	7,135 s	591 ms
OpenX	104,910	6,884 s	66 ms
AppNexus	182,686	6,867 s	38 ms
Scorecard Research	81,502	6,789 s	83 ms
Embedly	15,905	6,674 s	420 ms
Brandmetrics	36,552	6,672 s	183 ms
mPulse	61,262	6,614 s	108 ms
i-mobile	33,261	6,593 s	198 ms
AdScore	8,346	6,390 s	766 ms
Quantum Metric	2,966	6,382 s	2152 ms
Matomo	28,520	6,262 s	220 ms
Microsoft Hosted Libs	36,189	6,244 s	173 ms
33 Across	99,190	6,205 s	63 ms
PageSense	16,229	6,203 s	382 ms
Conversant	39,631	5,932 s	150 ms
Kameleoon	3,585	5,529 s	1542 ms
Nielsen NetRatings SiteCensus	14,246	5,510 s	387 ms
LoyaltyLion	7,043	5,399 s	767 ms
The Trade Desk	72,308	5,131 s	71 ms
VWO	10,913	5,071 s	465 ms
Gemius	30,525	4,946 s	162 ms
Revcontent	4,259	4,785 s	1124 ms
Bazaarvoice	8,127	4,690 s	577 ms
Inspectlet	7,307	4,671 s	639 ms
LINE Corporation	66,569	4,648 s	70 ms
Marker	4,369	4,590 s	1051 ms
Dynatrace	2,906	4,581 s	1576 ms
Hotmart	2,825	4,552 s	1611 ms
Datawrapper	650	4,491 s	6910 ms
Akamai	13,493	4,477 s	332 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.

{
    "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.