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

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	Unruly Media	5,165	0 ms
2	Nativo	23,265	0 ms
3	Bidswitch	64,373	0 ms
4	AdGear	40,592	1 ms
5	MaxPoint Interactive	7,960	1 ms
6	Tribal Fusion	104,276	1 ms
7	Crimtan	52,016	1 ms
8	iPROM	49,159	2 ms
9	adKernel	8,909	2 ms
10	TripleLift	3,895	2 ms
11	Beeswax	6,050	2 ms
12	33 Across	130,982	15 ms
13	Adform	76,151	23 ms
14	AppNexus	150,303	23 ms
15	GumGum	113,190	25 ms
16	Constant Contact	17,524	33 ms
17	Adyoulike	3,785	33 ms
18	LoopMe	34,648	40 ms
19	Sonobi	48,479	50 ms
20	Branch Metrics	7,599	59 ms
21	Simpli.fi	9,640	63 ms
22	MailMunch	16,346	65 ms
23	The Trade Desk	14,423	68 ms
24	RTB House AdPilot	4,593	71 ms
25	OpenX	66,689	77 ms
26	Twitter Online Conversion Tracking	68,207	77 ms
27	BlueCava	4,645	80 ms
28	ActiveCampaign	17,077	81 ms
29	StackAdapt	13,485	82 ms
30	Scorecard Research	45,137	83 ms
31	DTSCOUT	5,848	83 ms
32	Affiliate Window	4,652	90 ms
33	LinkedIn Ads	182,566	91 ms
34	Rocket Fuel	2,823	94 ms
35	sovrn	21,718	111 ms
36	Yahoo!	20,784	113 ms
37	Criteo	153,536	118 ms
38	Rakuten Marketing	3,182	123 ms
39	Impact Radius	4,026	124 ms
40	AudienceSearch	43,349	132 ms
41	Index Exchange	30,989	133 ms
42	Quora Ads	9,943	140 ms
43	LINE Corporation	24,223	143 ms
44	Crowd Control	83,913	146 ms
45	Gemius	15,845	149 ms
46	STINGRAY	6,811	152 ms
47	Intercept Interactive	18,073	154 ms
48	Boomtrain	2,222	155 ms
49	ucfunnel ucX	8,506	161 ms
50	Simplicity Marketing	2,609	162 ms
51	Bing Ads	47,579	165 ms
52	IPONWEB	24,946	165 ms
53	AdRiver	4,142	174 ms
54	TVSquared	4,930	181 ms
55	Technorati	22,687	188 ms
56	Smart AdServer	99,408	199 ms
57	Tynt	150,037	203 ms
58	InMobi	94,109	207 ms
59	Microad	6,816	225 ms
60	Outbrain	11,336	231 ms
61	Media.net	84,083	233 ms
62	i-mobile	4,863	236 ms
63	Salesforce.com	5,141	244 ms
64	ID5 Identity Cloud	61,561	247 ms
65	TrafficStars	7,538	260 ms
66	Unbounce	9,031	286 ms
67	LiveRamp Privacy Manager	18,102	300 ms
68	Teads	6,162	301 ms
69	Amazon Ads	173,879	303 ms
70	Adroll	29,368	308 ms
71	fluct	13,776	317 ms
72	Skimbit	79,082	326 ms
73	Supership	17,742	373 ms
74	Yandex Ads	8,434	461 ms
75	Attentive	8,692	497 ms
76	Cxense	3,742	515 ms
77	Yahoo! JAPAN Ads	52,852	551 ms
78	VigLink	6,441	563 ms
79	OptiMonk	10,175	594 ms
80	Klaviyo	141,506	595 ms
81	Privy	18,266	608 ms
82	WordAds	91,869	629 ms
83	Integral Ad Science	15,170	671 ms
84	AdScore	4,391	763 ms
85	Taboola	48,303	768 ms
86	LoyaltyLion	3,994	778 ms
87	LongTail Ad Solutions	5,663	801 ms
88	Moat	3,508	883 ms
89	Rubicon Project	207,350	925 ms
90	Geniee	15,664	960 ms
91	DoubleVerify	3,647	1122 ms
92	Sizmek	5,293	1433 ms
93	Pubmatic	214,222	1545 ms
94	Ad Lightning	3,865	1608 ms
95	Infolinks	6,073	1617 ms
96	Seedtag	2,433	1805 ms
97	MGID	8,796	2016 ms
98	Yahoo! Ad Exchange	5,024	2855 ms
99	Google/Doubleclick Ads	1,148,525	2897 ms
100	Mediavine	10,838	3682 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	4,807	47 ms
2	WordPress Site Stats	56,462	55 ms
3	SpeedCurve RUM	3,783	61 ms
4	Roxr Software	10,347	63 ms
5	Movable Ink	4,699	78 ms
6	Sailthru	1,259	82 ms
7	Smartlook	14,858	89 ms
8	Woopra	1,222	95 ms
9	LiveRamp IdentityLink	1,557	96 ms
10	Treasure Data	13,192	97 ms
11	mPulse	30,608	98 ms
12	XiTi	5,761	100 ms
13	StatCounter	48,566	101 ms
14	Exponea	1,288	104 ms
15	Conversant	47,288	108 ms
16	Google Analytics	4,258,452	108 ms
17	Brandmetrics	18,600	112 ms
18	Polldaddy	2,024	113 ms
19	CleverTap	1,227	124 ms
20	Stamped.io	11,912	132 ms
21	Snowplow	60,072	138 ms
22	Google Optimize	40,491	152 ms
23	Mixpanel	17,973	157 ms
24	Quantcast	62,298	162 ms
25	Braze	1,878	162 ms
26	Marchex	6,120	164 ms
27	Usabilla	1,331	165 ms
28	Reviews.co.uk	1,888	170 ms
29	Smart Insight Tracking	1,749	180 ms
30	Matomo	13,769	193 ms
31	Amplitude Mobile Analytics	35,143	197 ms
32	Chartbeat	6,305	198 ms
33	Parse.ly	6,077	216 ms
34	Clearbit	4,050	216 ms
35	Baidu Analytics	33,662	222 ms
36	Trust Pilot	43,901	234 ms
37	CallRail	28,748	235 ms
38	UpSellit	2,967	239 ms
39	CallTrackingMetrics	7,729	242 ms
40	etracker	5,541	265 ms
41	PageSense	5,634	277 ms
42	Nielsen NetRatings SiteCensus	16,364	336 ms
43	Survicate	3,250	350 ms
44	Pendo	12,447	354 ms
45	Reviews.io	4,135	356 ms
46	Segment	26,540	365 ms
47	Evergage	2,654	372 ms
48	Heap	13,259	380 ms
49	Okta	3,300	381 ms
50	Marketo	1,802	388 ms
51	Bazaarvoice	3,173	420 ms
52	Net Reviews	2,645	435 ms
53	AB Tasty	3,198	461 ms
54	BowNow	2,318	490 ms
55	Evidon	2,296	517 ms
56	Convert Insights	4,048	519 ms
57	Crazy Egg	19,740	520 ms
58	Feefo.com	1,961	591 ms
59	Appcues	2,378	592 ms
60	VWO	7,604	620 ms
61	Nosto	1,141	634 ms
62	Hotjar	321,477	638 ms
63	FullStory	13,065	679 ms
64	Qualtrics	6,872	680 ms
65	PowerReviews	1,475	777 ms
66	Clerk.io ApS	1,924	792 ms
67	Optimizely	13,015	796 ms
68	Lucky Orange	13,287	823 ms
69	TrackJS	1,973	846 ms
70	ContentSquare	2,628	891 ms
71	Kameleoon	2,187	913 ms
72	Insider	1,856	971 ms
73	Revolver Maps	2,006	1035 ms
74	Dynatrace	3,389	1096 ms
75	Gigya	2,012	1231 ms
76	Quantum Metric	1,149	1275 ms
77	Inspectlet	5,142	1357 ms
78	Yandex Metrica	576,659	1805 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	Shareaholic	1,181	91 ms
2	Pinterest	126,785	121 ms
3	AddToAny	63,826	143 ms
4	reddit	16,175	213 ms
5	LinkedIn	16,463	287 ms
6	ShareThis	86,550	328 ms
7	Facebook	3,103,706	380 ms
8	TikTok	220,242	448 ms
9	Kakao	64,115	628 ms
10	PIXNET	14,881	819 ms
11	Instagram	17,160	1278 ms
12	SocialShopWave	4,000	1463 ms
13	Disqus	1,770	2008 ms
14	Twitter	319,565	2211 ms
15	Tumblr	15,962	2663 ms
16	VK	20,771	2855 ms
17	LiveJournal	9,027	6134 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	Brightcove	12,833	1070 ms
2	Vimeo	137,373	2725 ms
3	Wistia	26,317	3722 ms
4	YouTube	938,794	4858 ms
5	Twitch	1,446	13724 ms

Developer Utilities

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

Rank	Name	Usage	Average Impact
1	Statuspage	1,201	30 ms
2	Raygun	2,088	84 ms
3	Rollbar	1,643	86 ms
4	Pusher	1,378	92 ms
5	Checkout.com	1,196	98 ms
6	iovation	2,103	107 ms
7	Klarna	8,565	110 ms
8	Cloudflare	337,521	125 ms
9	Doofinder	11,035	129 ms
10	CyberSource (Visa)	2,058	133 ms
11	Ipify	2,000	140 ms
12	Afterpay	7,759	154 ms
13	Seznam	8,535	160 ms
14	Amazon Pay	6,517	163 ms
15	Macropod BugHerd	2,478	166 ms
16	Netlify	1,298	196 ms
17	Highcharts	3,096	205 ms
18	LightWidget	9,544	206 ms
19	Riskified	1,842	216 ms
20	Cookie-Script.com	46,664	221 ms
21	Wufoo	1,541	227 ms
22	OneSignal	64,794	242 ms
23	New Relic	229,492	243 ms
24	Google reCAPTCHA	31,586	278 ms
25	Foxentry	1,884	282 ms
26	Cookiebot	175,618	308 ms
27	Swiftype	1,057	343 ms
28	TrustArc	6,258	343 ms
29	Clarity	345,295	350 ms
30	Hexton	30,178	358 ms
31	Trusted Shops	16,699	366 ms
32	Other Google APIs/SDKs	2,297,272	371 ms
33	Bugsnag	12,928	391 ms
34	Bold Commerce	11,260	430 ms
35	Key CDN	9,021	440 ms
36	Klevu Search	1,373	440 ms
37	GitHub	14,146	442 ms
38	GetSiteControl	2,966	453 ms
39	Affirm	6,276	488 ms
40	Yandex APIs	43,302	583 ms
41	iubenda	91,122	596 ms
42	ThreatMetrix	2,785	604 ms
43	Sentry	75,160	619 ms
44	Google Maps	1,195,463	621 ms
45	Mapbox	18,896	654 ms
46	AppDynamics	3,374	851 ms
47	PayPal	55,378	859 ms
48	Forter	6,257	885 ms
49	GoDaddy	122,531	906 ms
50	Vidyard	1,049	975 ms
51	Secomapp	1,995	1053 ms
52	Stripe	123,686	1108 ms
53	WisePops	1,961	1200 ms
54	Luigis Box	2,091	1208 ms
55	Marker	1,576	1214 ms
56	Signyfyd	2,407	1508 ms
57	Fastly	9,274	1995 ms
58	Adyen	2,278	2053 ms
59	Datacamp	1,217	2422 ms
60	Rambler	15,932	3996 ms
61	POWr	37,652	4562 ms
62	Esri ArcGIS	3,153	6060 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	210,802	166 ms
2	Dealer	1,940	332 ms
3	Civic	6,644	342 ms
4	Salesforce Commerce Cloud	3,891	370 ms
5	WordPress	295,900	641 ms
6	Global-e	1,161	723 ms
7	Shopify	296,099	765 ms
8	Ecwid	5,357	861 ms
9	Rackspace	1,916	883 ms
10	Tilda	67,454	1200 ms
11	Hatena Blog	42,275	1949 ms
12	Squarespace	233,793	3571 ms
13	WebsiteBuilder.com	4,754	4230 ms
14	Wix	441,849	4390 ms
15	Weebly	65,463	5720 ms

Marketing

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

Rank	Name	Usage	Average Impact
1	Albacross	1,212	65 ms
2	DemandBase	2,166	128 ms
3	Convertful	1,473	144 ms
4	RD Station	20,906	297 ms
5	SharpSpring	2,021	308 ms
6	Listrak	1,160	392 ms
7	Mailchimp	44,823	397 ms
8	OptinMonster	2,429	401 ms
9	Sojern	4,001	475 ms
10	Hubspot	146,221	511 ms
11	Wishpond Technologies	1,628	514 ms
12	Yotpo	25,832	613 ms
13	iZooto	2,303	618 ms
14	PureCars	1,408	671 ms
15	KARTE	1,732	903 ms
16	Judge.me	26,390	943 ms
17	Beeketing	2,042	973 ms
18	Wunderkind	1,196	1282 ms
19	Sumo	11,296	1386 ms
20	Bigcommerce	19,580	2223 ms
21	Drift	5,561	4261 ms
22	Tray Commerce	13,778	4531 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	iPerceptions	4,572	130 ms
2	Help Scout	4,399	135 ms
3	LiveTex	1,892	221 ms
4	WebEngage	2,158	267 ms
5	Pure Chat	3,097	323 ms
6	Tawk.to	107,991	361 ms
7	Smartsupp	21,142	391 ms
8	Comm100	1,019	416 ms
9	Jivochat	52,339	638 ms
10	LivePerson	2,680	665 ms
11	Intercom	32,322	1071 ms
12	LiveChat	38,242	1073 ms
13	Tidio Live Chat	24,209	1159 ms
14	Olark	6,571	1288 ms
15	ZenDesk	72,680	1471 ms
16	Dynamic Yield	1,795	1907 ms
17	Freshchat	6,810	2929 ms

Content & Publishing

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

Rank	Name	Usage	Average Impact
1	Spotify	10,720	7 ms
2	OpenTable	4,222	87 ms
3	TripAdvisor	2,000	134 ms
4	Accuweather	1,565	166 ms
5	Tencent	7,153	286 ms
6	Cloudinary	2,472	522 ms
7	Booking.com	2,493	530 ms
8	CPEx	1,067	603 ms
9	Revcontent	1,201	858 ms
10	AMP	73,908	989 ms
11	Embedly	10,222	1456 ms
12	issuu	2,637	1842 ms
13	SoundCloud	5,711	2408 ms
14	Hotmart	4,020	2865 ms
15	Dailymotion	5,136	9346 ms
16	Medium	18,170	10918 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	216,074	0 ms
2	Bootstrap CDN	28,205	55 ms
3	Monotype	3,181	204 ms
4	FontAwesome CDN	306,673	215 ms
5	Microsoft Hosted Libs	19,220	219 ms
6	Adobe TypeKit	98,647	345 ms
7	Fort Awesome	3,838	357 ms
8	jQuery CDN	706,780	364 ms
9	Akamai	9,598	396 ms
10	Cloudflare CDN	612,210	486 ms
11	JSDelivr CDN	345,059	620 ms
12	Azure Web Services	49,287	805 ms
13	Google CDN	3,277,645	1068 ms
14	CreateJS CDN	4,053	2868 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	167,978	193 ms
2	TagCommander	1,430	293 ms
3	Ensighten	3,070	510 ms
4	Tealium	27,039	594 ms
5	Google Tag Manager	7,750,346	697 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	1,647	167 ms
2	Optanon	114,606	430 ms
3	Google FundingChoices	404,501	560 ms
4	UniConsent CMP	1,221	627 ms
5	Didomi	39,040	720 ms
6	Usercentrics CMP	47,221	993 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	5,694	103 ms
2	ResponsiveVoice	6,349	119 ms
3	Browsealoud	1,772	311 ms
4	Amazon Web Services	114,939	409 ms
5	Heroku	14,352	955 ms
6	Calendly	3,986	1615 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	7,750,346	5,405,662 s	697 ms
YouTube	938,794	4,560,336 s	4858 ms
Google CDN	3,277,645	3,502,096 s	1068 ms
Google/Doubleclick Ads	1,148,525	3,327,660 s	2897 ms
Wix	441,849	1,939,898 s	4390 ms
Facebook	3,103,706	1,178,628 s	380 ms
Yandex Metrica	576,659	1,040,757 s	1805 ms
Other Google APIs/SDKs	2,297,272	851,954 s	371 ms
Squarespace	233,793	834,982 s	3571 ms
Google Maps	1,195,463	741,985 s	621 ms
Twitter	319,565	706,652 s	2211 ms
Google Analytics	4,258,452	461,364 s	108 ms
Weebly	65,463	374,457 s	5720 ms
Vimeo	137,373	374,316 s	2725 ms
Pubmatic	214,222	331,069 s	1545 ms
Cloudflare CDN	612,210	297,470 s	486 ms
jQuery CDN	706,780	257,591 s	364 ms
Google FundingChoices	404,501	226,496 s	560 ms
Shopify	296,099	226,454 s	765 ms
JSDelivr CDN	345,059	213,879 s	620 ms
Hotjar	321,477	205,054 s	638 ms
Medium	18,170	198,383 s	10918 ms
Rubicon Project	207,350	191,826 s	925 ms
WordPress	295,900	189,704 s	641 ms
POWr	37,652	171,775 s	4562 ms
Stripe	123,686	137,094 s	1108 ms
Clarity	345,295	120,722 s	350 ms
GoDaddy	122,531	110,960 s	906 ms
ZenDesk	72,680	106,919 s	1471 ms
TikTok	220,242	98,596 s	448 ms
Wistia	26,317	97,947 s	3722 ms
Klaviyo	141,506	84,178 s	595 ms
Hatena Blog	42,275	82,410 s	1949 ms
Tilda	67,454	80,949 s	1200 ms
Hubspot	146,221	74,698 s	511 ms
AMP	73,908	73,126 s	989 ms
FontAwesome CDN	306,673	65,797 s	215 ms
Rambler	15,932	63,667 s	3996 ms
Tray Commerce	13,778	62,434 s	4531 ms
VK	20,771	59,304 s	2855 ms
WordAds	91,869	57,759 s	629 ms
New Relic	229,492	55,832 s	243 ms
LiveJournal	9,027	55,367 s	6134 ms
iubenda	91,122	54,306 s	596 ms
Cookiebot	175,618	54,088 s	308 ms
Amazon Ads	173,879	52,740 s	303 ms
Optanon	114,606	49,310 s	430 ms
Dailymotion	5,136	48,001 s	9346 ms
PayPal	55,378	47,551 s	859 ms
Amazon Web Services	114,939	47,065 s	409 ms
Usercentrics CMP	47,221	46,881 s	993 ms
Sentry	75,160	46,559 s	619 ms
Bigcommerce	19,580	43,524 s	2223 ms
Tumblr	15,962	42,503 s	2663 ms
Cloudflare	337,521	42,245 s	125 ms
LiveChat	38,242	41,035 s	1073 ms
Kakao	64,115	40,275 s	628 ms
Mediavine	10,838	39,909 s	3682 ms
Azure Web Services	49,287	39,663 s	805 ms
Tawk.to	107,991	38,947 s	361 ms
Taboola	48,303	37,094 s	768 ms
Blogger	210,802	35,092 s	166 ms
Intercom	32,322	34,611 s	1071 ms
Adobe TypeKit	98,647	34,065 s	345 ms
Jivochat	52,339	33,398 s	638 ms
Adobe Tag Manager	167,978	32,419 s	193 ms
Tynt	150,037	30,446 s	203 ms
Yahoo! JAPAN Ads	52,852	29,096 s	551 ms
ShareThis	86,550	28,406 s	328 ms
Didomi	39,040	28,125 s	720 ms
Tidio Live Chat	24,209	28,056 s	1159 ms
Skimbit	79,082	25,805 s	326 ms
Yandex APIs	43,302	25,240 s	583 ms
Judge.me	26,390	24,885 s	943 ms
Drift	5,561	23,693 s	4261 ms
Instagram	17,160	21,936 s	1278 ms
WebsiteBuilder.com	4,754	20,109 s	4230 ms
Freshchat	6,810	19,946 s	2929 ms
Twitch	1,446	19,845 s	13724 ms
Smart AdServer	99,408	19,754 s	199 ms
Media.net	84,083	19,622 s	233 ms
InMobi	94,109	19,480 s	207 ms
Esri ArcGIS	3,153	19,107 s	6060 ms
Fastly	9,274	18,502 s	1995 ms
Criteo	153,536	18,074 s	118 ms
Mailchimp	44,823	17,804 s	397 ms
MGID	8,796	17,735 s	2016 ms
LinkedIn Ads	182,566	16,704 s	91 ms
Tealium	27,039	16,061 s	594 ms
Yotpo	25,832	15,827 s	613 ms
OneSignal	64,794	15,657 s	242 ms
Sumo	11,296	15,652 s	1386 ms
Pinterest	126,785	15,278 s	121 ms
ID5 Identity Cloud	61,561	15,231 s	247 ms
Geniee	15,664	15,032 s	960 ms
Embedly	10,222	14,886 s	1456 ms
Yahoo! Ad Exchange	5,024	14,342 s	2855 ms
SoundCloud	5,711	13,752 s	2408 ms
Brightcove	12,833	13,734 s	1070 ms
Heroku	14,352	13,704 s	955 ms
Mapbox	18,896	12,364 s	654 ms
Crowd Control	83,913	12,230 s	146 ms
PIXNET	14,881	12,189 s	819 ms
CreateJS CDN	4,053	11,623 s	2868 ms
Hotmart	4,020	11,516 s	2865 ms
Privy	18,266	11,097 s	608 ms
Lucky Orange	13,287	10,936 s	823 ms
Hexton	30,178	10,795 s	358 ms
Optimizely	13,015	10,354 s	796 ms
Cookie-Script.com	46,664	10,322 s	221 ms
Crazy Egg	19,740	10,267 s	520 ms
Trust Pilot	43,901	10,267 s	234 ms
Integral Ad Science	15,170	10,183 s	671 ms
Quantcast	62,298	10,071 s	162 ms
Infolinks	6,073	9,821 s	1617 ms
Segment	26,540	9,678 s	365 ms
AddToAny	63,826	9,140 s	143 ms
Adroll	29,368	9,055 s	308 ms
FullStory	13,065	8,875 s	679 ms
Google reCAPTCHA	31,586	8,793 s	278 ms
Olark	6,571	8,465 s	1288 ms
Snowplow	60,072	8,271 s	138 ms
Smartsupp	21,142	8,262 s	391 ms
Bing Ads	47,579	7,849 s	165 ms
Sizmek	5,293	7,584 s	1433 ms
Baidu Analytics	33,662	7,468 s	222 ms
Inspectlet	5,142	6,980 s	1357 ms
Amplitude Mobile Analytics	35,143	6,916 s	197 ms
CallRail	28,748	6,745 s	235 ms
Supership	17,742	6,623 s	373 ms
Calendly	3,986	6,439 s	1615 ms
GitHub	14,146	6,257 s	442 ms
Ad Lightning	3,865	6,216 s	1608 ms
RD Station	20,906	6,202 s	297 ms
Google Optimize	40,491	6,135 s	152 ms
Trusted Shops	16,699	6,116 s	366 ms
OptiMonk	10,175	6,047 s	594 ms
SocialShopWave	4,000	5,852 s	1463 ms
AudienceSearch	43,349	5,737 s	132 ms
Forter	6,257	5,535 s	885 ms
Nielsen NetRatings SiteCensus	16,364	5,497 s	336 ms
LiveRamp Privacy Manager	18,102	5,431 s	300 ms
Twitter Online Conversion Tracking	68,207	5,255 s	77 ms
Conversant	47,288	5,119 s	108 ms
OpenX	66,689	5,109 s	77 ms
Bugsnag	12,928	5,058 s	391 ms
Heap	13,259	5,043 s	380 ms
StatCounter	48,566	4,912 s	101 ms
issuu	2,637	4,857 s	1842 ms
Bold Commerce	11,260	4,842 s	430 ms
LinkedIn	16,463	4,731 s	287 ms
VWO	7,604	4,715 s	620 ms
Adyen	2,278	4,678 s	2053 ms
Qualtrics	6,872	4,674 s	680 ms
Ecwid	5,357	4,614 s	861 ms
LongTail Ad Solutions	5,663	4,539 s	801 ms
Pendo	12,447	4,409 s	354 ms
Seedtag	2,433	4,392 s	1805 ms
fluct	13,776	4,366 s	317 ms
Attentive	8,692	4,323 s	497 ms
Technorati	22,687	4,257 s	188 ms
Microsoft Hosted Libs	19,220	4,203 s	219 ms
IPONWEB	24,946	4,127 s	165 ms
Index Exchange	30,989	4,119 s	133 ms
DoubleVerify	3,647	4,092 s	1122 ms
Key CDN	9,021	3,970 s	440 ms
Yandex Ads	8,434	3,889 s	461 ms
Akamai	9,598	3,801 s	396 ms
Scorecard Research	45,137	3,736 s	83 ms
Dynatrace	3,389	3,713 s	1096 ms
Signyfyd	2,407	3,630 s	1508 ms
VigLink	6,441	3,629 s	563 ms
Disqus	1,770	3,555 s	2008 ms
AppNexus	150,303	3,479 s	23 ms
LINE Corporation	24,223	3,457 s	143 ms
reddit	16,175	3,451 s	213 ms
Dynamic Yield	1,795	3,422 s	1907 ms
AdScore	4,391	3,349 s	763 ms
LoyaltyLion	3,994	3,109 s	778 ms
WordPress Site Stats	56,462	3,098 s	55 ms
Moat	3,508	3,097 s	883 ms
Affirm	6,276	3,063 s	488 ms
mPulse	30,608	2,998 s	98 ms
Datacamp	1,217	2,948 s	2422 ms
Conversion Labs	1,876	2,907 s	1550 ms
AppDynamics	3,374	2,871 s	851 ms
Mixpanel	17,973	2,828 s	157 ms
GumGum	113,190	2,806 s	25 ms
Intercept Interactive	18,073	2,785 s	154 ms
Matomo	13,769	2,653 s	193 ms
Outbrain	11,336	2,618 s	231 ms
Unbounce	9,031	2,579 s	286 ms
Luigis Box	2,091	2,526 s	1208 ms
Gigya	2,012	2,477 s	1231 ms
Sonobi	48,479	2,437 s	50 ms
sovrn	21,718	2,407 s	111 ms
Gemius	15,845	2,361 s	149 ms
WisePops	1,961	2,354 s	1200 ms
Yahoo!	20,784	2,354 s	113 ms
ContentSquare	2,628	2,342 s	891 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.