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.

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

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	SpotXchange	4,019	5 ms
2	EQ works	10,684	5 ms
3	Bidswitch	33,252	5 ms
4	AdGear	6,295	6 ms
5	TripleLift	12,845	7 ms
6	DeepIntent	37,170	8 ms
7	iPROM	24,065	8 ms
8	ContextWeb	21,450	8 ms
9	Sonobi	5,385	8 ms
10	Beachfront Media	15,666	9 ms
11	Yieldmo	15,765	9 ms
12	Onfocus	3,682	10 ms
13	Sharethrough	20,156	10 ms
14	OpenX	98,335	11 ms
15	33 Across	111,990	12 ms
16	RTB House AdPilot	11,878	13 ms
17	OneTag	30,313	18 ms
18	Tribal Fusion	72,355	24 ms
19	GumGum	133,349	26 ms
20	Adform	99,030	35 ms
21	AppNexus	160,132	39 ms
22	Reklama	4,476	41 ms
23	Constant Contact	17,214	43 ms
24	Audience Rate	5,008	55 ms
25	MailMunch	14,787	56 ms
26	SiteScout	9,068	61 ms
27	DialogTech SourceTrak	5,040	66 ms
28	Simpli.fi	14,756	68 ms
29	Media Math	8,988	74 ms
30	The Trade Desk	29,112	81 ms
31	F@N Communications	4,861	82 ms
32	Nend	17,104	82 ms
33	Quora Ads	5,111	82 ms
34	Index Exchange	161,427	84 ms
35	StackAdapt	8,859	84 ms
36	Scorecard Research	9,643	86 ms
37	Teads	81,569	87 ms
38	Twitter Online Conversion Tracking	96,552	95 ms
39	Affiliate Window	5,329	95 ms
40	Simplicity Marketing	3,104	97 ms
41	Branch Metrics	14,865	103 ms
42	BlueCava	7,464	110 ms
43	Rocket Fuel	3,326	121 ms
44	Tradelab	4,840	132 ms
45	DTSCOUT	55,061	139 ms
46	ZEOTAP	3,612	142 ms
47	Yahoo!	19,028	144 ms
48	LinkedIn Ads	16,882	151 ms
49	OwnerIQ	3,232	155 ms
50	Gemius	31,242	159 ms
51	DialogTech	2,833	164 ms
52	Between Digital	4,123	170 ms
53	FreakOut	4,117	173 ms
54	i-mobile	25,220	173 ms
55	STINGRAY	11,303	174 ms
56	LINE Corporation	27,037	179 ms
57	BlueKai	104,983	182 ms
58	Smart AdServer	17,187	189 ms
59	AudienceSearch	55,076	202 ms
60	Unbounce	10,998	210 ms
61	Bing Ads	53,883	212 ms
62	Tynt	160,878	212 ms
63	Amazon Ads	111,461	223 ms
64	Salesforce.com	3,976	224 ms
65	IPONWEB	26,063	237 ms
66	fluct	27,911	262 ms
67	sovrn	15,771	268 ms
68	TrafficStars	8,480	282 ms
69	Adroll	35,911	321 ms
70	JuicyAds	4,357	323 ms
71	Criteo	204,634	336 ms
72	Yahoo! JAPAN Ads	44,813	339 ms
73	Rubicon Project	218,380	368 ms
74	Geniee	19,801	380 ms
75	Supership	19,320	387 ms
76	VigLink	54,877	402 ms
77	Crowd Control	68,907	448 ms
78	Skimbit	81,343	449 ms
79	Refersion	3,593	545 ms
80	Mediavine	9,166	552 ms
81	Outbrain	54,262	591 ms
82	Yandex Ads	28,732	688 ms
83	Privy	24,159	690 ms
84	WordAds	104,998	707 ms
85	Cxense	5,950	734 ms
86	Moat	10,334	760 ms
87	Taboola	43,757	774 ms
88	Klaviyo	108,716	831 ms
89	LongTail Ad Solutions	8,297	899 ms
90	Media.net	93,135	940 ms
91	LoyaltyLion	4,688	968 ms
92	Attentive	8,876	1243 ms
93	Pubmatic	249,252	1336 ms
94	Infolinks	6,532	1585 ms
95	MGID	13,141	1634 ms
96	Integral Ad Science	8,018	1846 ms
97	Sizmek	6,854	2104 ms
98	Google/Doubleclick Ads	1,645,056	2272 ms
99	Connatix	6,219	2942 ms
100	Bridgewell DSP	22,472	4586 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 LUX	3,031	64 ms
2	Pingdom RUM	2,195	65 ms
3	Mouseflow	8,298	68 ms
4	Fastest Forward	1,289	71 ms
5	WordPress Site Stats	123,784	72 ms
6	Alexa	5,389	75 ms
7	Sailthru	6,215	86 ms
8	Keen	11,015	91 ms
9	Ekm Systems	1,351	93 ms
10	Woopra	2,177	93 ms
11	Polldaddy	2,676	98 ms
12	StatCounter	61,989	103 ms
13	Conversant	41,672	109 ms
14	Movable Ink	1,972	109 ms
15	Brandmetrics	1,274	110 ms
16	GoSquared	1,462	114 ms
17	Treasure Data	14,327	114 ms
18	Crazy Egg	62,501	124 ms
19	IBM Acoustic Campaign	1,245	128 ms
20	Quantcast	129,106	135 ms
21	LiveRamp IdentityLink	36,558	136 ms
22	KISSmetrics	1,155	138 ms
23	Okta	3,261	145 ms
24	Stamped.io	11,980	159 ms
25	CleverTap	2,081	159 ms
26	DotMetrics	1,642	161 ms
27	Fastly Insights	11,650	163 ms
28	Amplitude Mobile Analytics	18,633	168 ms
29	Roxr Software	19,332	169 ms
30	Snowplow	44,392	172 ms
31	Google Analytics	7,322,447	174 ms
32	ResponseTap	1,321	175 ms
33	Mixpanel	23,236	178 ms
34	Braze	3,810	181 ms
35	Searchanise	4,409	187 ms
36	Smartlook	1,568	194 ms
37	Marchex	12,688	214 ms
38	Exponea	1,275	218 ms
39	Google Optimize	76,691	226 ms
40	CallRail	25,235	244 ms
41	Smart Insight Tracking	2,468	259 ms
42	Heap	15,403	261 ms
43	Chartbeat	8,255	265 ms
44	Radar	1,262	266 ms
45	Usabilla	1,928	281 ms
46	Reviews.io	2,141	287 ms
47	Matomo	4,513	292 ms
48	Reviews.co.uk	2,554	313 ms
49	Marketo	3,213	313 ms
50	Trust Pilot	40,439	332 ms
51	Kameleoon	1,963	345 ms
52	etracker	5,478	350 ms
53	Baidu Analytics	42,799	366 ms
54	Evergage	2,478	374 ms
55	Parse.ly	4,369	375 ms
56	mPulse	28,684	424 ms
57	Monetate	1,063	425 ms
58	Qualtrics	7,674	482 ms
59	PageSense	4,333	502 ms
60	Net Reviews	4,504	508 ms
61	Convert Insights	1,390	524 ms
62	Evidon	3,410	554 ms
63	BowNow	2,265	608 ms
64	VWO	10,331	618 ms
65	ForeSee	1,101	619 ms
66	Segment	30,962	625 ms
67	FullStory	16,930	657 ms
68	Bazaarvoice	3,113	666 ms
69	Optimizely	35,910	672 ms
70	Clerk.io ApS	2,038	693 ms
71	Nosto	1,555	724 ms
72	Pendo	8,741	783 ms
73	Snapchat	42,908	785 ms
74	Hotjar	369,505	829 ms
75	Nielsen NetRatings SiteCensus	28,534	857 ms
76	Kampyle	1,067	909 ms
77	AB Tasty	4,417	919 ms
78	Survicate	2,793	926 ms
79	PowerReviews	1,782	949 ms
80	Feefo.com	2,401	992 ms
81	Revolver Maps	3,809	1051 ms
82	ContentSquare	2,950	1059 ms
83	Histats	44,755	1209 ms
84	TrackJS	1,753	1247 ms
85	Quantum Metric	1,162	1281 ms
86	Lucky Orange	19,568	1282 ms
87	SessionCam	1,198	1314 ms
88	Salesforce	7,488	1407 ms
89	Yandex Metrica	604,100	1474 ms
90	Dynatrace	3,873	1492 ms
91	Gigya	2,722	1546 ms
92	Inspectlet	7,429	1765 ms
93	Ezoic	2,735	3222 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	Shareaholic	2,901	106 ms
2	reddit	5,148	112 ms
3	Pinterest	212,032	121 ms
4	AddToAny	80,743	122 ms
5	Spot.IM	1,836	227 ms
6	LinkedIn	24,898	355 ms
7	Facebook	3,486,665	411 ms
8	AddShoppers	3,804	484 ms
9	ShareThis	158,618	507 ms
10	Twitter	484,989	550 ms
11	TikTok	134,263	558 ms
12	Kakao	67,284	571 ms
13	Instagram	11,611	1304 ms
14	AddThis	181,269	1405 ms
15	SocialShopWave	4,747	1806 ms
16	VK	75,276	2140 ms
17	Disqus	1,585	2937 ms
18	PIXNET	23,077	3470 ms
19	Tumblr	43,368	4456 ms
20	LiveJournal	10,019	4805 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	Twitch	1,614	67 ms
2	Vimeo	137,277	1642 ms
3	Brightcove	22,236	1720 ms
4	Wistia	29,029	4348 ms
5	YouTube	1,227,566	5356 ms

Developer Utilities

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

Rank	Name	Usage	Average Impact
1	Webmarked	1,128	63 ms
2	Rollbar	4,080	83 ms
3	Siteimprove	14,565	94 ms
4	AddEvent	1,239	96 ms
5	Raygun	2,606	101 ms
6	Pusher	1,508	104 ms
7	CyberSource (Visa)	1,806	109 ms
8	Key CDN	8,339	126 ms
9	Bitly	2,306	131 ms
10	Ipify	1,923	133 ms
11	New Relic	314,174	140 ms
12	iovation	2,703	151 ms
13	Cloudflare	284,182	152 ms
14	Seznam	16,314	160 ms
15	iubenda	72,326	210 ms
16	Netlify	1,113	210 ms
17	Highcharts	3,087	236 ms
18	Foxentry	1,783	237 ms
19	GitHub	9,523	251 ms
20	Klevu Search	1,817	292 ms
21	LightWidget	12,897	293 ms
22	TrustArc	5,430	294 ms
23	Accessibe Accessibility Overlay	31,841	316 ms
24	Sift Science	1,625	333 ms
25	Cookie-Script.com	13,553	354 ms
26	Riskified	1,362	355 ms
27	Other Google APIs/SDKs	2,931,154	360 ms
28	Cookiebot	104,544	360 ms
29	Hexton	39,126	361 ms
30	OneSignal	81,717	380 ms
31	Auth0	4,989	407 ms
32	Swiftype	1,582	417 ms
33	Clarity	216,230	423 ms
34	Bold Commerce	20,058	430 ms
35	Wufoo	2,494	435 ms
36	Amazon Pay	5,233	457 ms
37	Google reCAPTCHA	19,512	489 ms
38	Affirm	6,250	492 ms
39	Trusted Shops	18,241	518 ms
40	Fastly	41,558	580 ms
41	AppDynamics	4,298	586 ms
42	Sentry	54,022	606 ms
43	GetSiteControl	3,840	634 ms
44	Forter	4,453	636 ms
45	Bugsnag	10,856	650 ms
46	PayPal	70,083	703 ms
47	WisePops	3,337	849 ms
48	Mapbox	19,852	880 ms
49	GoDaddy	89,821	1001 ms
50	Google Maps	1,391,111	1019 ms
51	MaxCDN Enterprise	5,216	1098 ms
52	Stripe	99,992	1107 ms
53	Vidyard	1,499	1115 ms
54	ThreatMetrix	1,387	1137 ms
55	Luigis Box	1,600	1299 ms
56	Secomapp	5,389	1580 ms
57	Adyen	1,842	2026 ms
58	Yandex APIs	43,559	2296 ms
59	Rambler	18,847	3337 ms
60	Esri ArcGIS	3,379	5283 ms
61	POWr	41,931	5339 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	317,042	140 ms
2	Civic	5,254	410 ms
3	Typepad	1,448	557 ms
4	Dealer	1,807	635 ms
5	WordPress	388,396	749 ms
6	Rackspace	2,776	871 ms
7	Ecwid	6,747	1228 ms
8	Tilda	53,099	1552 ms
9	Salesforce Commerce Cloud	3,950	1963 ms
10	Shopify	391,429	2625 ms
11	Squarespace	189,968	3246 ms
12	Hatena Blog	48,322	3684 ms
13	Weebly	68,560	3952 ms
14	Webflow	42,220	4777 ms
15	WebsiteBuilder.com	5,739	4961 ms
16	Wix	355,758	5268 ms

Marketing

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

Rank	Name	Usage	Average Impact
1	SalesLoft	1,426	56 ms
2	Podsights	2,355	74 ms
3	Madison Logic	3,246	90 ms
4	SATORI	1,120	102 ms
5	DemandBase	3,772	109 ms
6	Pardot	3,292	135 ms
7	Convertful	2,035	189 ms
8	Wicked Reports	2,076	210 ms
9	Albacross	3,135	216 ms
10	Beeketing	3,861	241 ms
11	Sojern	3,097	263 ms
12	iZooto	2,032	270 ms
13	RD Station	22,672	340 ms
14	Listrak	1,419	447 ms
15	Mailchimp	59,523	514 ms
16	Hubspot	135,071	570 ms
17	OptinMonster	5,212	691 ms
18	Yotpo	25,807	700 ms
19	Wishpond Technologies	1,648	726 ms
20	Judge.me	35,133	729 ms
21	Wunderkind	2,033	1417 ms
22	PureCars	3,022	1685 ms
23	KARTE	1,735	1716 ms
24	Sumo	19,485	2017 ms
25	Bigcommerce	20,090	2708 ms
26	Tray Commerce	11,146	4042 ms
27	Drift	9,870	5026 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	Provide Support	1,284	72 ms
2	Salesforce Live Agent	1,839	107 ms
3	SnapEngage	1,834	110 ms
4	ClickDesk	1,396	210 ms
5	BoldChat	1,863	211 ms
6	Foursixty	2,063	258 ms
7	LiveTex	2,873	291 ms
8	Tidio Live Chat	42,085	336 ms
9	WebEngage	1,487	401 ms
10	Help Scout	4,854	440 ms
11	Pure Chat	6,929	459 ms
12	Tawk.to	131,032	464 ms
13	iPerceptions	6,140	612 ms
14	iAdvize SAS	1,094	698 ms
15	Comm100	1,631	819 ms
16	LivePerson	4,772	878 ms
17	Intercom	27,001	1054 ms
18	Jivochat	81,940	1130 ms
19	Smartsupp	27,875	1156 ms
20	LiveChat	44,826	1198 ms
21	ContactAtOnce	1,420	1762 ms
22	Olark	9,642	1801 ms
23	ZenDesk	96,844	1814 ms
24	Dynamic Yield	2,208	2687 ms
25	Freshchat	7,995	4097 ms

Content & Publishing

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

Rank	Name	Usage	Average Impact
1	Spotify	10,941	7 ms
2	TripAdvisor	3,136	197 ms
3	Accuweather	2,125	204 ms
4	CPEx	2,493	259 ms
5	Tencent	13,067	272 ms
6	SnapWidget	17,353	341 ms
7	Flowplayer	1,269	381 ms
8	Booking.com	3,255	492 ms
9	OpenTable	3,648	683 ms
10	Cloudinary	2,203	688 ms
11	Covert Pics	3,679	1233 ms
12	AMP	68,143	1286 ms
13	Embedly	9,906	1561 ms
14	issuu	3,360	2374 ms
15	Hotmart	5,064	2767 ms
16	SoundCloud	8,057	2902 ms
17	Dailymotion	5,946	10453 ms
18	Medium	11,780	10610 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	Cloud.typography	1,462	0 ms
2	Google Fonts	203,448	0 ms
3	Bootstrap CDN	79,457	37 ms
4	FontAwesome CDN	320,326	191 ms
5	Monotype	9,074	240 ms
6	Adobe TypeKit	130,232	246 ms
7	Microsoft Hosted Libs	32,142	283 ms
8	jQuery CDN	693,482	453 ms
9	Akamai	17,049	487 ms
10	Cloudflare CDN	602,403	503 ms
11	Fort Awesome	2,524	585 ms
12	Azure Web Services	47,894	624 ms
13	Unpkg	118,453	628 ms
14	JSDelivr CDN	259,351	630 ms
15	Google CDN	3,424,176	853 ms
16	Yandex CDN	171,735	1623 ms
17	CreateJS CDN	4,690	4445 ms

Tag Management

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

Rank	Name	Usage	Average Impact
1	BrightTag / Signal	6,089	229 ms
2	Yahoo! Tag Manager	14,177	241 ms
3	Adobe Tag Manager	165,645	367 ms
4	TagCommander	1,814	370 ms
5	Google Tag Manager	6,108,115	378 ms
6	Tealium	29,692	691 ms
7	Ensighten	5,478	1002 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	1,729	247 ms
2	Quantcast Choice	29,453	388 ms
3	Optanon	92,076	494 ms
4	Consent Manager CMP	4,723	553 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	Browser-Update.org	2,012	74 ms
2	Azure Traffic Manager	1,233	76 ms
3	ResponsiveVoice	5,610	96 ms
4	ReadSpeaker	6,152	108 ms
5	Arbor	1,137	176 ms
6	Skype	2,422	290 ms
7	Parking Crew	14,135	359 ms
8	Pagely	1,024	395 ms
9	Browsealoud	2,392	446 ms
10	Amazon Web Services	124,586	594 ms
11	Calendly	5,728	1176 ms
12	Polyfill service	3,790	1808 ms
13	Heroku	20,362	2949 ms
14	uLogin	2,326	3267 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
YouTube	1,227,566	6,574,466 s	5356 ms
Google/Doubleclick Ads	1,645,056	3,737,242 s	2272 ms
Google CDN	3,424,176	2,921,062 s	853 ms
Google Tag Manager	6,108,115	2,308,159 s	378 ms
Wix	355,758	1,874,236 s	5268 ms
Facebook	3,486,665	1,431,828 s	411 ms
Google Maps	1,391,111	1,417,812 s	1019 ms
Google Analytics	7,322,447	1,276,611 s	174 ms
Other Google APIs/SDKs	2,931,154	1,055,113 s	360 ms
Shopify	391,429	1,027,457 s	2625 ms
Yandex Metrica	604,100	890,510 s	1474 ms
Squarespace	189,968	616,544 s	3246 ms
Pubmatic	249,252	332,941 s	1336 ms
jQuery CDN	693,482	313,945 s	453 ms
Hotjar	369,505	306,408 s	829 ms
Cloudflare CDN	602,403	302,758 s	503 ms
WordPress	388,396	290,844 s	749 ms
Yandex CDN	171,735	278,795 s	1623 ms
Weebly	68,560	270,983 s	3952 ms
Twitter	484,989	266,936 s	550 ms
AddThis	181,269	254,712 s	1405 ms
Vimeo	137,277	225,363 s	1642 ms
POWr	41,931	223,857 s	5339 ms
Webflow	42,220	201,706 s	4777 ms
Tumblr	43,368	193,246 s	4456 ms
Hatena Blog	48,322	178,001 s	3684 ms
ZenDesk	96,844	175,649 s	1814 ms
JSDelivr CDN	259,351	163,521 s	630 ms
VK	75,276	161,094 s	2140 ms
Wistia	29,029	126,230 s	4348 ms
Medium	11,780	124,991 s	10610 ms
Stripe	99,992	110,644 s	1107 ms
Bridgewell DSP	22,472	103,053 s	4586 ms
Yandex APIs	43,559	100,009 s	2296 ms
Jivochat	81,940	92,586 s	1130 ms
Clarity	216,230	91,369 s	423 ms
Klaviyo	108,716	90,310 s	831 ms
GoDaddy	89,821	89,918 s	1001 ms
AMP	68,143	87,649 s	1286 ms
Media.net	93,135	87,575 s	940 ms
Tilda	53,099	82,400 s	1552 ms
ShareThis	158,618	80,413 s	507 ms
Rubicon Project	218,380	80,256 s	368 ms
PIXNET	23,077	80,073 s	3470 ms
Hubspot	135,071	76,951 s	570 ms
TikTok	134,263	74,888 s	558 ms
Unpkg	118,453	74,371 s	628 ms
WordAds	104,998	74,191 s	707 ms
Amazon Web Services	124,586	73,945 s	594 ms
Criteo	204,634	68,726 s	336 ms
Rambler	18,847	62,897 s	3337 ms
Dailymotion	5,946	62,153 s	10453 ms
FontAwesome CDN	320,326	61,147 s	191 ms
Adobe Tag Manager	165,645	60,783 s	367 ms
Tawk.to	131,032	60,750 s	464 ms
Heroku	20,362	60,049 s	2949 ms
Bigcommerce	20,090	54,402 s	2708 ms
Histats	44,755	54,105 s	1209 ms
LiveChat	44,826	53,719 s	1198 ms
Drift	9,870	49,602 s	5026 ms
PayPal	70,083	49,259 s	703 ms
LiveJournal	10,019	48,141 s	4805 ms
Optanon	92,076	45,450 s	494 ms
Tray Commerce	11,146	45,055 s	4042 ms
Blogger	317,042	44,491 s	140 ms
New Relic	314,174	43,947 s	140 ms
Cloudflare	284,182	43,090 s	152 ms
Sumo	19,485	39,308 s	2017 ms
Kakao	67,284	38,426 s	571 ms
Brightcove	22,236	38,244 s	1720 ms
Cookiebot	104,544	37,673 s	360 ms
Skimbit	81,343	36,540 s	449 ms
Tynt	160,878	34,097 s	212 ms
Taboola	43,757	33,880 s	774 ms
Snapchat	42,908	33,692 s	785 ms
Sentry	54,022	32,757 s	606 ms
Freshchat	7,995	32,757 s	4097 ms
Smartsupp	27,875	32,210 s	1156 ms
Adobe TypeKit	130,232	32,068 s	246 ms
Outbrain	54,262	32,058 s	591 ms
OneSignal	81,717	31,055 s	380 ms
Crowd Control	68,907	30,854 s	448 ms
Mailchimp	59,523	30,613 s	514 ms
Azure Web Services	47,894	29,898 s	624 ms
WebsiteBuilder.com	5,739	28,474 s	4961 ms
Intercom	27,001	28,462 s	1054 ms
Judge.me	35,133	25,599 s	729 ms
Pinterest	212,032	25,585 s	121 ms
Lucky Orange	19,568	25,094 s	1282 ms
Amazon Ads	111,461	24,860 s	223 ms
Nielsen NetRatings SiteCensus	28,534	24,441 s	857 ms
Optimizely	35,910	24,129 s	672 ms
Fastly	41,558	24,102 s	580 ms
SoundCloud	8,057	23,382 s	2902 ms
VigLink	54,877	22,056 s	402 ms
MGID	13,141	21,476 s	1634 ms
CreateJS CDN	4,690	20,846 s	4445 ms
Tealium	29,692	20,505 s	691 ms
Yandex Ads	28,732	19,781 s	688 ms
Segment	30,962	19,348 s	625 ms
BlueKai	104,983	19,073 s	182 ms
Connatix	6,219	18,294 s	2942 ms
Yotpo	25,807	18,074 s	700 ms
Esri ArcGIS	3,379	17,852 s	5283 ms
Mapbox	19,852	17,474 s	880 ms
Quantcast	129,106	17,469 s	135 ms
Olark	9,642	17,367 s	1801 ms
Google Optimize	76,691	17,364 s	226 ms
Privy	24,159	16,677 s	690 ms
Baidu Analytics	42,799	15,676 s	366 ms
Embedly	9,906	15,462 s	1561 ms
Yahoo! JAPAN Ads	44,813	15,191 s	339 ms
iubenda	72,326	15,185 s	210 ms
Instagram	11,611	15,143 s	1304 ms
Integral Ad Science	8,018	14,804 s	1846 ms
Sizmek	6,854	14,420 s	2104 ms
Tidio Live Chat	42,085	14,137 s	336 ms
Hexton	39,126	14,124 s	361 ms
Hotmart	5,064	14,012 s	2767 ms
Index Exchange	161,427	13,482 s	84 ms
Trust Pilot	40,439	13,428 s	332 ms
Inspectlet	7,429	13,113 s	1765 ms
mPulse	28,684	12,159 s	424 ms
Adroll	35,911	11,518 s	321 ms
Quantcast Choice	29,453	11,419 s	388 ms
Bing Ads	53,883	11,414 s	212 ms
FullStory	16,930	11,129 s	657 ms
AudienceSearch	55,076	11,117 s	202 ms
Attentive	8,876	11,031 s	1243 ms
Salesforce	7,488	10,535 s	1407 ms
Seedtag	1,856	10,459 s	5635 ms
Infolinks	6,532	10,354 s	1585 ms
Accessibe Accessibility Overlay	31,841	10,076 s	316 ms
AddToAny	80,743	9,871 s	122 ms
Google reCAPTCHA	19,512	9,550 s	489 ms
Trusted Shops	18,241	9,451 s	518 ms
Twitter Online Conversion Tracking	96,552	9,181 s	95 ms
Microsoft Hosted Libs	32,142	9,104 s	283 ms
WordPress Site Stats	123,784	8,922 s	72 ms
LinkedIn	24,898	8,835 s	355 ms
Ezoic	2,735	8,812 s	3222 ms
Bold Commerce	20,058	8,629 s	430 ms
SocialShopWave	4,747	8,572 s	1806 ms
Secomapp	5,389	8,512 s	1580 ms
Akamai	17,049	8,305 s	487 ms
Ecwid	6,747	8,286 s	1228 ms
issuu	3,360	7,976 s	2374 ms
Moat	10,334	7,858 s	760 ms
Crazy Egg	62,501	7,772 s	124 ms
Salesforce Commerce Cloud	3,950	7,753 s	1963 ms
RD Station	22,672	7,701 s	340 ms
DTSCOUT	55,061	7,669 s	139 ms
Snowplow	44,392	7,624 s	172 ms
uLogin	2,326	7,599 s	3267 ms
Geniee	19,801	7,534 s	380 ms
Supership	19,320	7,482 s	387 ms
LongTail Ad Solutions	8,297	7,459 s	899 ms
fluct	27,911	7,305 s	262 ms
Teads	81,569	7,094 s	87 ms
Bugsnag	10,856	7,057 s	650 ms
Polyfill service	3,790	6,853 s	1808 ms
Pendo	8,741	6,847 s	783 ms
Calendly	5,728	6,737 s	1176 ms
Afterpay	20,206	6,441 s	319 ms
VWO	10,331	6,384 s	618 ms
StatCounter	61,989	6,384 s	103 ms
IPONWEB	26,063	6,176 s	237 ms
AppNexus	160,132	6,176 s	39 ms
CallRail	25,235	6,149 s	244 ms
Dynamic Yield	2,208	5,933 s	2687 ms
SnapWidget	17,353	5,920 s	341 ms
Dynatrace	3,873	5,778 s	1492 ms
MaxCDN Enterprise	5,216	5,727 s	1098 ms
Ensighten	5,478	5,487 s	1002 ms
PureCars	3,022	5,093 s	1685 ms
Parking Crew	14,135	5,080 s	359 ms
Mediavine	9,166	5,060 s	552 ms
LiveRamp IdentityLink	36,558	4,970 s	136 ms
Gemius	31,242	4,960 s	159 ms
LINE Corporation	27,037	4,828 s	179 ms
Cookie-Script.com	13,553	4,794 s	354 ms
Disqus	1,585	4,656 s	2937 ms
LoyaltyLion	4,688	4,539 s	968 ms
Covert Pics	3,679	4,535 s	1233 ms
Conversant	41,672	4,522 s	109 ms
i-mobile	25,220	4,369 s	173 ms
Cxense	5,950	4,365 s	734 ms
sovrn	15,771	4,224 s	268 ms
Gigya	2,722	4,209 s	1546 ms
LivePerson	4,772	4,188 s	878 ms
Mixpanel	23,236	4,127 s	178 ms
AB Tasty	4,417	4,057 s	919 ms
Heap	15,403	4,017 s	261 ms
Revolver Maps	3,809	4,003 s	1051 ms
fam	1,152	3,888 s	3375 ms
LightWidget	12,897	3,785 s	293 ms
iPerceptions	6,140	3,755 s	612 ms
Adyen	1,842	3,732 s	2026 ms
Qualtrics	7,674	3,702 s	482 ms
OptinMonster	5,212	3,600 s	691 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.