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

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/",
//     "categories": ["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	Bidswitch	14,579	5 ms
2	SpotXchange	2,297	5 ms
3	EQ works	4,687	5 ms
4	DeepIntent	24,009	7 ms
5	ContextWeb	13,985	7 ms
6	TripleLift	8,870	8 ms
7	Beachfront Media	8,658	9 ms
8	engage:BDR	4,057	10 ms
9	Yieldmo	7,971	11 ms
10	RTB House AdPilot	8,567	12 ms
11	OpenX	47,625	13 ms
12	OneTag	20,783	14 ms
13	Sonobi	2,075	14 ms
14	33 Across	38,526	15 ms
15	Tribal Fusion	35,913	17 ms
16	Sharethrough	11,944	18 ms
17	District M	22,397	28 ms
18	AppNexus	91,502	40 ms
19	Constant Contact	10,401	43 ms
20	Reklama	3,759	45 ms
21	Adform	57,801	46 ms
22	F@N Communications	3,519	52 ms
23	Quora Ads	1,792	55 ms
24	MailMunch	7,347	55 ms
25	SiteScout	6,643	57 ms
26	Nend	5,297	61 ms
27	GumGum	25,781	62 ms
28	DialogTech SourceTrak	2,956	65 ms
29	Simpli.fi	9,249	66 ms
30	Media Math	6,704	67 ms
31	Twitter Online Conversion Tracking	59,070	73 ms
32	The Trade Desk	21,309	76 ms
33	StackAdapt	6,523	82 ms
34	Scorecard Research	3,697	88 ms
35	Teads	37,270	88 ms
36	Affiliate Window	4,063	95 ms
37	Index Exchange	84,768	96 ms
38	Drip	1,920	102 ms
39	BlueCava	6,148	105 ms
40	Branch Metrics	3,766	110 ms
41	DTSCOUT	32,257	123 ms
42	Tynt	86,165	126 ms
43	Tradelab	1,882	126 ms
44	Between Digital	2,791	142 ms
45	Yahoo!	12,370	143 ms
46	Gemius	19,760	146 ms
47	ExoClick	1,809	149 ms
48	OwnerIQ	2,083	154 ms
49	LinkedIn Ads	8,543	156 ms
50	BlueKai	63,410	163 ms
51	IPONWEB	4,455	165 ms
52	LINE Corporation	18,542	167 ms
53	fluct	14,550	174 ms
54	i-mobile	12,960	181 ms
55	FreakOut	2,659	192 ms
56	Adscale	6,238	194 ms
57	Unbounce	7,630	196 ms
58	Bing Ads	35,530	200 ms
59	Smart AdServer	12,828	201 ms
60	Salesforce.com	2,990	208 ms
61	AudienceSearch	29,110	208 ms
62	Amazon Ads	69,838	213 ms
63	sovrn	10,134	217 ms
64	STINGRAY	6,409	221 ms
65	Intercept Interactive	2,780	255 ms
66	TrafficStars	6,490	271 ms
67	Yahoo! JAPAN Ads	26,721	287 ms
68	JuicyAds	2,891	313 ms
69	Adroll	24,959	320 ms
70	Criteo	126,803	322 ms
71	Geniee	10,631	328 ms
72	Rubicon Project	127,384	333 ms
73	Crowd Control	32,988	334 ms
74	Supership	9,273	367 ms
75	Outbrain	7,160	402 ms
76	VigLink	32,265	410 ms
77	Yandex Ads	19,961	426 ms
78	Skimbit	46,988	450 ms
79	Refersion	2,881	528 ms
80	Mediavine	8,772	540 ms
81	WordAds	50,306	595 ms
82	Sortable	1,937	655 ms
83	Privy	14,399	723 ms
84	Cxense	4,360	732 ms
85	JustUno	1,783	737 ms
86	Taboola	30,613	780 ms
87	Klaviyo	73,353	809 ms
88	LongTail Ad Solutions	5,295	863 ms
89	LoyaltyLion	3,357	1011 ms
90	Pubmatic	148,549	1026 ms
91	Media.net	53,801	1106 ms
92	Moat	7,645	1157 ms
93	Attentive	7,332	1220 ms
94	Infolinks	4,608	1656 ms
95	MGID	9,445	1765 ms
96	Sizmek	5,614	1786 ms
97	Integral Ad Science	6,631	2022 ms
98	Google/Doubleclick Ads	1,053,047	2346 ms
99	Connatix	4,827	2472 ms
100	Bridgewell DSP	13,406	3860 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	SalesLoft	1,158	52 ms
2	Mouseflow	5,449	60 ms
3	Pingdom RUM	1,278	64 ms
4	Alexa	3,256	67 ms
5	WordPress Site Stats	59,245	68 ms
6	Sailthru	4,001	83 ms
7	SpeedCurve LUX	1,418	86 ms
8	Woopra	1,317	97 ms
9	StatCounter	31,848	97 ms
10	Polldaddy	1,221	98 ms
11	Crazy Egg	40,219	102 ms
12	Brandmetrics	1,864	102 ms
13	Conversant	22,057	108 ms
14	Treasure Data	9,438	114 ms
15	Quantcast	85,604	124 ms
16	LiveRamp IdentityLink	22,324	132 ms
17	CleverTap	1,404	146 ms
18	Fastly Insights	4,727	148 ms
19	ResponseTap	1,094	151 ms
20	Roxr Software	12,684	165 ms
21	Snowplow	17,391	167 ms
22	Stamped.io	7,477	167 ms
23	Searchanise	4,482	171 ms
24	Amplitude Mobile Analytics	8,874	174 ms
25	Google Analytics	4,266,204	174 ms
26	Mixpanel	12,896	177 ms
27	Braze	2,075	197 ms
28	Google Optimize	48,878	212 ms
29	Exponea	1,000	219 ms
30	Marchex	8,094	222 ms
31	CallRail	15,422	246 ms
32	Heap	8,210	252 ms
33	Chartbeat	6,654	262 ms
34	Smart Insight Tracking	2,116	265 ms
35	Reviews.io	1,555	276 ms
36	Matomo	2,449	277 ms
37	Marketo	2,090	299 ms
38	Usabilla	1,444	325 ms
39	Qualtrics	4,344	326 ms
40	Trust Pilot	28,680	332 ms
41	etracker	3,577	336 ms
42	Baidu Analytics	21,052	337 ms
43	Parse.ly	3,555	353 ms
44	Reviews.co.uk	2,002	403 ms
45	mPulse	21,808	412 ms
46	Evergage	1,443	432 ms
47	PageSense	2,666	461 ms
48	Convert Insights	1,073	497 ms
49	Net Reviews	3,836	506 ms
50	Evidon	2,690	510 ms
51	BowNow	1,398	571 ms
52	VWO	7,066	571 ms
53	FullStory	10,020	607 ms
54	Segment	16,962	626 ms
55	Optimizely	21,048	652 ms
56	Bazaarvoice	2,660	671 ms
57	Pendo	3,754	686 ms
58	Clerk.io ApS	1,723	690 ms
59	Snapchat	30,754	703 ms
60	Hotjar	251,050	713 ms
61	Nosto	1,464	733 ms
62	PowerReviews	1,397	879 ms
63	Nielsen NetRatings SiteCensus	18,036	921 ms
64	Revolver Maps	1,914	974 ms
65	AB Tasty	3,329	974 ms
66	Feefo.com	1,831	1049 ms
67	ContentSquare	2,407	1067 ms
68	Histats	26,133	1087 ms
69	Lucky Orange	13,549	1096 ms
70	TrackJS	1,615	1115 ms
71	Yandex Metrica	343,926	1287 ms
72	SessionCam	1,005	1392 ms
73	Salesforce	6,064	1424 ms
74	Gigya	2,249	1458 ms
75	Dynatrace	2,579	1530 ms
76	Inspectlet	4,894	1577 ms
77	KARTE	1,345	1865 ms
78	Ezoic	2,171	3472 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	Shareaholic	1,660	92 ms
2	AddToAny	59,970	111 ms
3	Pinterest	134,837	115 ms
4	reddit	2,134	121 ms
5	LinkedIn	13,936	342 ms
6	Facebook	2,088,175	397 ms
7	AddShoppers	2,228	500 ms
8	ShareThis	91,265	501 ms
9	Twitter	278,674	509 ms
10	TikTok	84,074	536 ms
11	Kakao	34,851	576 ms
12	Instagram	6,703	1298 ms
13	AddThis	105,805	1341 ms
14	SocialShopWave	3,277	1678 ms
15	VK	44,217	1991 ms
16	PIXNET	13,661	3422 ms
17	Tumblr	14,939	3944 ms
18	LiveJournal	4,500	4773 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	Twitch	1,015	66 ms
2	Vimeo	70,795	1278 ms
3	Brightcove	12,344	1774 ms
4	Wistia	14,847	3256 ms
5	YouTube	646,588	5219 ms

Developer Utilities

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

Rank	Name	Usage	Average Impact
1	Siteimprove	10,874	87 ms
2	Accessibe Accessibility Overlay	5,260	88 ms
3	Rollbar	1,557	112 ms
4	Bitly	1,464	121 ms
5	Key CDN	6,083	125 ms
6	iovation	1,833	139 ms
7	New Relic	177,167	139 ms
8	Ipify	1,440	150 ms
9	Seznam	12,648	155 ms
10	Cloudflare	118,065	158 ms
11	iubenda	40,114	200 ms
12	Highcharts	1,774	216 ms
13	Signyfyd	1,110	221 ms
14	Foxentry	1,514	223 ms
15	TrustArc	3,912	258 ms
16	Klevu Search	1,562	260 ms
17	GitHub	4,283	264 ms
18	LightWidget	8,122	280 ms
19	Cookiebot	65,170	337 ms
20	Hexton	24,872	345 ms
21	Riskified	1,108	358 ms
22	Other Google APIs/SDKs	1,560,923	361 ms
23	OneSignal	60,077	367 ms
24	Cookie-Script.com	7,668	393 ms
25	Bold Commerce	13,898	427 ms
26	Swiftype	1,180	430 ms
27	Sentry	112,112	433 ms
28	Amazon Pay	3,825	456 ms
29	Fastly	26,320	461 ms
30	Affirm	4,621	492 ms
31	Google reCAPTCHA	10,996	509 ms
32	Trusted Shops	14,150	512 ms
33	GetSiteControl	2,949	552 ms
34	Forter	1,564	634 ms
35	Bugsnag	6,485	647 ms
36	PayPal	31,520	721 ms
37	WisePops	2,821	743 ms
38	Mapbox	10,421	774 ms
39	AppDynamics	2,077	828 ms
40	GoDaddy	31,084	932 ms
41	MaxCDN Enterprise	2,506	957 ms
42	Google Maps	695,922	982 ms
43	Stripe	47,361	1024 ms
44	Luigis Box	1,423	1156 ms
45	Vidyard	1,006	1168 ms
46	Secomapp	3,770	1420 ms
47	Adyen	1,080	2026 ms
48	Yandex APIs	21,729	2138 ms
49	Rambler	9,956	3307 ms
50	Esri ArcGIS	1,686	5162 ms
51	POWr	22,940	5560 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	164,511	139 ms
2	Civic	3,352	409 ms
3	Dealer	1,323	592 ms
4	WordPress	195,967	731 ms
5	Rackspace	1,175	839 ms
6	Ecwid	3,196	1104 ms
7	Tilda	20,717	1636 ms
8	Salesforce Commerce Cloud	3,385	1836 ms
9	Shopify	219,487	2665 ms
10	Squarespace	75,862	3172 ms
11	Hatena Blog	26,353	3512 ms
12	Weebly	23,439	3818 ms
13	WebsiteBuilder.com	2,221	4810 ms
14	Wix	156,804	5156 ms

Marketing

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

Rank	Name	Usage	Average Impact
1	Podsights	1,786	71 ms
2	Madison Logic	2,494	82 ms
3	DemandBase	2,656	116 ms
4	Pardot	2,370	136 ms
5	Wicked Reports	1,085	191 ms
6	Albacross	1,949	209 ms
7	Beeketing	2,342	234 ms
8	iZooto	1,616	240 ms
9	Sojern	1,934	276 ms
10	RD Station	16,159	322 ms
11	Listrak	1,215	466 ms
12	Mailchimp	33,456	495 ms
13	Hubspot	82,097	568 ms
14	Judge.me	21,829	609 ms
15	OptinMonster	4,073	700 ms
16	Yotpo	17,730	748 ms
17	Wunderkind	1,660	1425 ms
18	PureCars	2,761	1787 ms
19	Sumo	12,847	1958 ms
20	Bigcommerce	12,501	2864 ms
21	Drift	5,810	4994 ms
22	Tray Commerce	7,028	5707 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	SnapEngage	1,391	104 ms
2	BoldChat	1,350	235 ms
3	Foursixty	1,644	238 ms
4	LiveTex	1,656	321 ms
5	Tidio Live Chat	23,673	326 ms
6	Tawk.to	75,335	427 ms
7	Pure Chat	4,065	447 ms
8	Help Scout	3,286	453 ms
9	iPerceptions	4,768	638 ms
10	Jivochat	48,455	831 ms
11	LivePerson	3,706	848 ms
12	Intercom	17,238	1026 ms
13	Smartsupp	18,378	1111 ms
14	LiveChat	25,143	1182 ms
15	ContactAtOnce	1,235	1566 ms
16	Olark	6,778	1793 ms
17	ZenDesk	65,420	1837 ms
18	Dynamic Yield	1,404	3072 ms
19	Freshchat	5,474	4054 ms

Content & Publishing

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

Rank	Name	Usage	Average Impact
1	Accuweather	1,095	194 ms
2	CPEx	1,455	264 ms
3	Tencent	6,969	309 ms
4	SnapWidget	10,483	328 ms
5	Covert Pics	2,341	390 ms
6	Booking.com	2,001	455 ms
7	Cloudinary	1,242	591 ms
8	OpenTable	2,298	604 ms
9	Hotmart	2,013	1106 ms
10	AMP	37,003	1292 ms
11	Embedly	4,567	1581 ms
12	issuu	2,031	2035 ms
13	Spotify	5,662	2479 ms
14	SoundCloud	4,242	2816 ms
15	Medium	1,511	10371 ms
16	Dailymotion	3,233	12872 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	92,818	0 ms
2	Bootstrap CDN	32,415	37 ms
3	Edge Web Fonts	1,047	94 ms
4	FontAwesome CDN	173,075	192 ms
5	Microsoft Hosted Libs	19,907	247 ms
6	Monotype	5,303	265 ms
7	Adobe TypeKit	57,451	311 ms
8	jQuery CDN	388,629	433 ms
9	Cloudflare CDN	328,568	498 ms
10	Azure Web Services	31,257	561 ms
11	JSDelivr CDN	137,639	591 ms
12	Unpkg	59,972	598 ms
13	Fort Awesome	1,369	602 ms
14	Akamai	9,698	619 ms
15	Google CDN	1,910,663	794 ms
16	Yandex CDN	99,930	1511 ms
17	CreateJS CDN	3,083	3793 ms

Tag Management

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

Rank	Name	Usage	Average Impact
1	BrightTag / Signal	4,531	225 ms
2	Yahoo! Tag Manager	10,825	232 ms
3	Google Tag Manager	3,497,756	356 ms
4	TagCommander	1,411	360 ms
5	Adobe Tag Manager	88,773	493 ms
6	Tealium	19,194	811 ms
7	Ensighten	4,223	910 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	1,304	211 ms
2	Optanon	58,633	477 ms
3	Consent Manager CMP	3,468	505 ms
4	Quantcast Choice	26,540	650 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	3,121	88 ms
2	ReadSpeaker	4,301	106 ms
3	Skype	1,246	258 ms
4	Parking Crew	5,284	359 ms
5	Browsealoud	1,591	363 ms
6	Amazon Web Services	71,864	402 ms
7	Calendly	3,870	755 ms
8	Polyfill service	1,796	1433 ms
9	Heroku	11,879	2701 ms
10	uLogin	1,416	3666 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	646,588	3,374,534 s	5219 ms
Google/Doubleclick Ads	1,053,047	2,470,668 s	2346 ms
Google CDN	1,910,663	1,516,436 s	794 ms
Google Tag Manager	3,497,756	1,244,461 s	356 ms
Facebook	2,088,175	828,544 s	397 ms
Wix	156,804	808,543 s	5156 ms
Google Analytics	4,266,204	743,844 s	174 ms
Google Maps	695,922	683,561 s	982 ms
Shopify	219,487	584,831 s	2665 ms
Other Google APIs/SDKs	1,560,923	564,037 s	361 ms
Yandex Metrica	343,926	442,545 s	1287 ms
Squarespace	75,862	240,608 s	3172 ms
Hotjar	251,050	178,945 s	713 ms
jQuery CDN	388,629	168,145 s	433 ms
Cloudflare CDN	328,568	163,750 s	498 ms
Pubmatic	148,549	152,383 s	1026 ms
Yandex CDN	99,930	151,020 s	1511 ms
WordPress	195,967	143,217 s	731 ms
AddThis	105,805	141,919 s	1341 ms
Twitter	278,674	141,724 s	509 ms
POWr	22,940	127,545 s	5560 ms
ZenDesk	65,420	120,195 s	1837 ms
Hatena Blog	26,353	92,559 s	3512 ms
Vimeo	70,795	90,507 s	1278 ms
Weebly	23,439	89,486 s	3818 ms
VK	44,217	88,026 s	1991 ms
JSDelivr CDN	137,639	81,408 s	591 ms
Media.net	53,801	59,528 s	1106 ms
Klaviyo	73,353	59,363 s	809 ms
Tumblr	14,939	58,920 s	3944 ms
Bridgewell DSP	13,406	51,744 s	3860 ms
Sentry	112,112	48,572 s	433 ms
Stripe	47,361	48,484 s	1024 ms
Wistia	14,847	48,344 s	3256 ms
AMP	37,003	47,795 s	1292 ms
PIXNET	13,661	46,746 s	3422 ms
Hubspot	82,097	46,601 s	568 ms
Yandex APIs	21,729	46,466 s	2138 ms
ShareThis	91,265	45,763 s	501 ms
TikTok	84,074	45,068 s	536 ms
Adobe Tag Manager	88,773	43,725 s	493 ms
Rubicon Project	127,384	42,372 s	333 ms
Dailymotion	3,233	41,615 s	12872 ms
Criteo	126,803	40,777 s	322 ms
Jivochat	48,455	40,277 s	831 ms
Tray Commerce	7,028	40,107 s	5707 ms
Unpkg	59,972	35,871 s	598 ms
Bigcommerce	12,501	35,804 s	2864 ms
Tilda	20,717	33,885 s	1636 ms
FontAwesome CDN	173,075	33,250 s	192 ms
Rambler	9,956	32,929 s	3307 ms
Tawk.to	75,335	32,135 s	427 ms
Heroku	11,879	32,084 s	2701 ms
WordAds	50,306	29,944 s	595 ms
LiveChat	25,143	29,719 s	1182 ms
Drift	5,810	29,012 s	4994 ms
GoDaddy	31,084	28,968 s	932 ms
Amazon Web Services	71,864	28,910 s	402 ms
Histats	26,133	28,403 s	1087 ms
Optanon	58,633	27,966 s	477 ms
Sumo	12,847	25,158 s	1958 ms
New Relic	177,167	24,608 s	139 ms
Taboola	30,613	23,889 s	780 ms
Blogger	164,511	22,934 s	139 ms
PayPal	31,520	22,720 s	721 ms
Freshchat	5,474	22,191 s	4054 ms
OneSignal	60,077	22,033 s	367 ms
Cookiebot	65,170	21,960 s	337 ms
Brightcove	12,344	21,894 s	1774 ms
Snapchat	30,754	21,621 s	703 ms
LiveJournal	4,500	21,480 s	4773 ms
Skimbit	46,988	21,148 s	450 ms
Smartsupp	18,378	20,413 s	1111 ms
Kakao	34,851	20,074 s	576 ms
Cloudflare	118,065	18,692 s	158 ms
Adobe TypeKit	57,451	17,871 s	311 ms
Intercom	17,238	17,684 s	1026 ms
Azure Web Services	31,257	17,539 s	561 ms
Quantcast Choice	26,540	17,248 s	650 ms
MGID	9,445	16,674 s	1765 ms
Nielsen NetRatings SiteCensus	18,036	16,611 s	921 ms
Mailchimp	33,456	16,567 s	495 ms
Medium	1,511	15,671 s	10371 ms
Tealium	19,194	15,569 s	811 ms
Pinterest	134,837	15,503 s	115 ms
Amazon Ads	69,838	14,889 s	213 ms
Lucky Orange	13,549	14,846 s	1096 ms
Spotify	5,662	14,038 s	2479 ms
Optimizely	21,048	13,713 s	652 ms
Integral Ad Science	6,631	13,409 s	2022 ms
Judge.me	21,829	13,286 s	609 ms
Yotpo	17,730	13,264 s	748 ms
VigLink	32,265	13,242 s	410 ms
Olark	6,778	12,150 s	1793 ms
Fastly	26,320	12,138 s	461 ms
SoundCloud	4,242	11,947 s	2816 ms
Connatix	4,827	11,934 s	2472 ms
CreateJS CDN	3,083	11,694 s	3793 ms
Crowd Control	32,988	11,016 s	334 ms
Tynt	86,165	10,863 s	126 ms
WebsiteBuilder.com	2,221	10,684 s	4810 ms
Quantcast	85,604	10,623 s	124 ms
Segment	16,962	10,616 s	626 ms
Privy	14,399	10,414 s	723 ms
Google Optimize	48,878	10,362 s	212 ms
BlueKai	63,410	10,314 s	163 ms
Sizmek	5,614	10,026 s	1786 ms
Trust Pilot	28,680	9,521 s	332 ms
mPulse	21,808	8,979 s	412 ms
Attentive	7,332	8,947 s	1220 ms
Moat	7,645	8,845 s	1157 ms
Esri ArcGIS	1,686	8,703 s	5162 ms
Instagram	6,703	8,702 s	1298 ms
Salesforce	6,064	8,636 s	1424 ms
Hexton	24,872	8,590 s	345 ms
Yandex Ads	19,961	8,512 s	426 ms
Index Exchange	84,768	8,152 s	96 ms
Mapbox	10,421	8,066 s	774 ms
iubenda	40,114	8,006 s	200 ms
Adroll	24,959	7,983 s	320 ms
Inspectlet	4,894	7,717 s	1577 ms
Tidio Live Chat	23,673	7,715 s	326 ms
Yahoo! JAPAN Ads	26,721	7,681 s	287 ms
Infolinks	4,608	7,630 s	1656 ms
Ezoic	2,171	7,539 s	3472 ms
Trusted Shops	14,150	7,240 s	512 ms
Embedly	4,567	7,221 s	1581 ms
Bing Ads	35,530	7,114 s	200 ms
Baidu Analytics	21,052	7,089 s	337 ms
AddToAny	59,970	6,685 s	111 ms
Salesforce Commerce Cloud	3,385	6,214 s	1836 ms
FullStory	10,020	6,080 s	607 ms
AudienceSearch	29,110	6,060 s	208 ms
Akamai	9,698	6,001 s	619 ms
Bold Commerce	13,898	5,929 s	427 ms
Google reCAPTCHA	10,996	5,592 s	509 ms
SocialShopWave	3,277	5,498 s	1678 ms
Secomapp	3,770	5,352 s	1420 ms
RD Station	16,159	5,210 s	322 ms
uLogin	1,416	5,191 s	3666 ms
PureCars	2,761	4,934 s	1787 ms
Microsoft Hosted Libs	19,907	4,914 s	247 ms
LinkedIn	13,936	4,763 s	342 ms
Mediavine	8,772	4,740 s	540 ms
LongTail Ad Solutions	5,295	4,569 s	863 ms
Dynamic Yield	1,404	4,313 s	3072 ms
Twitter Online Conversion Tracking	59,070	4,313 s	73 ms
Bugsnag	6,485	4,198 s	647 ms
issuu	2,031	4,134 s	2035 ms
Crazy Egg	40,219	4,115 s	102 ms
VWO	7,066	4,038 s	571 ms
WordPress Site Stats	59,245	4,012 s	68 ms
DTSCOUT	32,257	3,954 s	123 ms
Dynatrace	2,579	3,946 s	1530 ms
Ensighten	4,223	3,841 s	910 ms
CallRail	15,422	3,793 s	246 ms
AppNexus	91,502	3,703 s	40 ms
Ecwid	3,196	3,530 s	1104 ms
Geniee	10,631	3,491 s	328 ms
SnapWidget	10,483	3,442 s	328 ms
Supership	9,273	3,399 s	367 ms
LoyaltyLion	3,357	3,394 s	1011 ms
Teads	37,270	3,293 s	88 ms
Gigya	2,249	3,278 s	1458 ms
AB Tasty	3,329	3,244 s	974 ms
Cxense	4,360	3,191 s	732 ms
fam	935	3,157 s	3377 ms
LivePerson	3,706	3,142 s	848 ms
LINE Corporation	18,542	3,093 s	167 ms
StatCounter	31,848	3,092 s	97 ms
iPerceptions	4,768	3,040 s	638 ms
Cookie-Script.com	7,668	3,014 s	393 ms
Disqus	896	2,941 s	3282 ms
LiveRamp IdentityLink	22,324	2,938 s	132 ms
Calendly	3,870	2,922 s	755 ms
Snowplow	17,391	2,905 s	167 ms
Gemius	19,760	2,884 s	146 ms
Outbrain	7,160	2,882 s	402 ms
OptinMonster	4,073	2,852 s	700 ms
Admixer for Publishers	1,169	2,851 s	2439 ms
Yieldify	414	2,700 s	6522 ms
LoopMe	522	2,657 s	5090 ms
Adform	57,801	2,650 s	46 ms
SearchSpring	616	2,600 s	4221 ms
Smart AdServer	12,828	2,582 s	201 ms
Pendo	3,754	2,575 s	686 ms
Polyfill service	1,796	2,574 s	1433 ms
ContentSquare	2,407	2,567 s	1067 ms
fluct	14,550	2,534 s	174 ms
Yahoo! Tag Manager	10,825	2,509 s	232 ms
KARTE	1,345	2,508 s	1865 ms
MaxCDN Enterprise	2,506	2,398 s	957 ms
Conversant	22,057	2,382 s	108 ms
Wunderkind	1,660	2,365 s	1425 ms
i-mobile	12,960	2,341 s	181 ms
Mixpanel	12,896	2,278 s	177 ms
LightWidget	8,122	2,274 s	280 ms
Affirm	4,621	2,272 s	492 ms
Hotmart	2,013	2,227 s	1106 ms
sovrn	10,134	2,198 s	217 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",
    "categories": ["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.