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. 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 inititiave 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

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.

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.

2019-05-06 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.

2019-05-13 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

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	GumGum	2,887	19 ms
2	ExoClick	1,212	43 ms
3	SublimeSkinz	1,094	58 ms
4	MailMunch	5,095	60 ms
5	Geniee	1,161	68 ms
6	Salesforce.com	1,017	70 ms
7	District M	2,606	72 ms
8	Rakuten Marketing	1,208	72 ms
9	BlueKai	2,302	75 ms
10	PushCrew	2,926	76 ms
11	FreakOut	3,826	76 ms
12	Constant Contact	1,314	80 ms
13	Scorecard Research	6,956	86 ms
14	Gemius	4,535	87 ms
15	Tynt	22,558	87 ms
16	Rubicon Project	39,353	90 ms
17	Popads	2,896	103 ms
18	Nativo	1,091	103 ms
19	Outbrain	8,189	104 ms
20	AppNexus	1,248	105 ms
21	Unbounce	3,591	105 ms
22	Amazon Ads	25,338	107 ms
23	i-mobile	3,227	110 ms
24	LINE Corporation	5,182	113 ms
25	Sharethrough	1,655	114 ms
26	Intent Media	8,019	116 ms
27	Bing Ads	15,786	116 ms
28	Adroll	47,959	117 ms
29	JuicyAds	1,498	125 ms
30	Smart AdServer	5,189	126 ms
31	DTSCOUT	12,679	132 ms
32	Index Exchange	4,946	133 ms
33	Attentive	1,205	146 ms
34	WordAds	18,478	149 ms
35	Skimbit	15,819	167 ms
36	Yahoo!	6,183	172 ms
37	OptiMonk	1,601	173 ms
38	Teads	3,457	177 ms
39	Cxense	4,374	179 ms
40	TrafficStars	2,040	187 ms
41	Adform	6,772	189 ms
42	sovrn	4,673	190 ms
43	Tribal Fusion	1,050	191 ms
44	Unruly Media	1,189	193 ms
45	OpenX	3,015	193 ms
46	Bizible	1,300	194 ms
47	Perfect Market	1,595	219 ms
48	GetResponse	1,073	219 ms
49	Sortable	1,551	220 ms
50	Criteo	62,125	237 ms
51	Adyoulike	1,234	239 ms
52	Permutive	9,556	243 ms
53	Refersion	1,320	249 ms
54	VigLink	7,097	309 ms
55	Privy	13,047	309 ms
56	Yandex Ads	25,906	313 ms
57	Pubmatic	52,613	315 ms
58	Media.net	14,529	341 ms
59	Taboola	24,583	364 ms
60	LongTail Ad Solutions	3,433	365 ms
61	Klaviyo	14,593	392 ms
62	piano	1,183	459 ms
63	DoubleVerify	1,772	548 ms
64	RevJet	1,210	550 ms
65	MGID	8,210	574 ms
66	Infolinks	3,699	579 ms
67	33 Across	1,188	615 ms
68	Vidible	1,146	625 ms
69	Admixer for Publishers	1,043	642 ms
70	MediaVine	6,490	655 ms
71	Bridgewell DSP	14,079	791 ms
72	Moat	6,862	817 ms
73	LoyaltyLion	1,300	830 ms
74	Adloox	5,759	921 ms
75	Integral Ad Science	8,013	1028 ms
76	Sizmek	1,484	1047 ms
77	LKQD	1,335	1449 ms
78	Google/Doubleclick Ads	680,948	1456 ms
79	fam	2,135	1807 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	StatCounter	3,403	59 ms
2	Treasure Data	4,833	62 ms
3	WordPress Site Stats	3,732	64 ms
4	Roxr Software	1,623	66 ms
5	Amplitude Mobile Analytics	2,429	69 ms
6	Heap	2,605	72 ms
7	Mixpanel	7,513	75 ms
8	Google Analytics	1,200,666	77 ms
9	Chartbeat	4,492	79 ms
10	Quantcast	3,787	80 ms
11	Hotjar	177,468	84 ms
12	Parse.ly	3,278	91 ms
13	Searchanise	4,302	91 ms
14	Smart Insight Tracking	1,161	93 ms
15	etracker	1,643	94 ms
16	Snowplow	5,845	95 ms
17	CallRail	7,019	101 ms
18	Nielsen NetRatings SiteCensus	11,805	102 ms
19	Marchex	2,503	104 ms
20	Baidu Analytics	10,739	106 ms
21	Crazy Egg	4,988	110 ms
22	Evidon	1,061	111 ms
23	ContentSquare	1,367	130 ms
24	VWO	4,724	158 ms
25	Trust Pilot	15,202	164 ms
26	Net Reviews	2,537	176 ms
27	PageSense	1,294	180 ms
28	FullStory	7,654	184 ms
29	Segment	9,541	191 ms
30	Kampyle	1,094	206 ms
31	Optimizely	19,583	223 ms
32	Nosto	1,946	225 ms
33	UserReport	1,300	228 ms
34	BounceX	1,386	233 ms
35	mPulse	13,177	246 ms
36	PowerReviews	1,043	261 ms
37	Marketo	1,336	359 ms
38	Inspectlet	5,605	361 ms
39	Histats	13,537	361 ms
40	Bazaarvoice	1,845	397 ms
41	Snapchat	13,344	410 ms
42	Salesforce	10,892	478 ms
43	Lucky Orange	7,529	491 ms
44	Feefo.com	1,686	502 ms
45	Gigya	2,261	579 ms
46	Yandex Metrica	292,542	580 ms
47	Ezoic	1,329	582 ms
48	Revolver Maps	1,144	609 ms
49	AB Tasty	3,010	1594 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	AddToAny	24,490	87 ms
2	Pinterest	17,218	89 ms
3	LinkedIn	14,038	111 ms
4	VK	13,473	121 ms
5	Twitter	213,911	139 ms
6	Kakao	18,109	158 ms
7	Instagram	9,441	184 ms
8	Yandex Share	24,181	184 ms
9	Facebook	1,461,331	229 ms
10	ShareThis	40,133	234 ms
11	SocialShopWave	2,044	302 ms
12	AddThis	118,289	403 ms
13	Disqus	1,252	994 ms
14	LiveJournal	3,680	1327 ms
15	PIXNET	15,434	1508 ms
16	Tumblr	7,972	2048 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	Vimeo	10,403	355 ms
2	Brightcove	6,615	809 ms
3	YouTube	408,326	849 ms
4	Wistia	13,083	928 ms
5	Twitch	1,068	1896 ms

Developer Utilities

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

Rank	Name	Usage	Average Impact
1	Key CDN	1,468	55 ms
2	LightWidget	2,325	66 ms
3	Siteimprove	1,510	76 ms
4	Trusted Shops	5,639	79 ms
5	New Relic	13,062	95 ms
6	Accessibe	3,561	99 ms
7	GetSiteControl	1,812	99 ms
8	Riskified	1,074	106 ms
9	Affirm	2,500	113 ms
10	iubenda	12,781	124 ms
11	Optanon	8,025	128 ms
12	Swiftype	1,544	135 ms
13	Seznam	1,654	135 ms
14	Bold Commerce	13,095	144 ms
15	Cookiebot	20,838	147 ms
16	Sift Science	1,080	148 ms
17	Other Google APIs/SDKs	580,415	168 ms
18	Amazon Pay	5,751	169 ms
19	TrustArc	1,370	180 ms
20	MaxCDN Enterprise	2,394	198 ms
21	GitHub	1,653	232 ms
22	Fraudlogix	2,244	258 ms
23	Fastly	6,694	275 ms
24	PayPal	15,436	342 ms
25	Stripe	23,538	388 ms
26	Cloudflare	53,319	465 ms
27	Google Maps	267,417	520 ms
28	AppDynamics	1,281	527 ms
29	Secomapp	2,150	546 ms
30	Bugsnag	8,686	569 ms
31	Rambler	7,698	691 ms
32	GoDaddy	6,687	700 ms
33	Sentry	9,061	715 ms
34	Signyfyd	1,691	867 ms
35	Mapbox	5,206	877 ms
36	Yandex APIs	27,480	1080 ms
37	POWr	16,407	1364 ms
38	Esri ArcGIS	1,692	4750 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	23,674	327 ms
2	Salesforce Commerce Cloud	2,623	342 ms
3	WordPress	92,546	404 ms
4	Dealer	8,637	433 ms
5	Ecwid	1,399	739 ms
6	Tilda	7,842	747 ms
7	Squarespace	39,492	911 ms
8	Adobe Business Catalyst	3,181	971 ms
9	Shopify	107,323	1058 ms
10	Weebly	13,271	1433 ms
11	CDK Dealer Management	3,429	1568 ms
12	Hatena Blog	13,205	1579 ms
13	Wix	54,909	5962 ms

Marketing

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

Rank	Name	Usage	Average Impact
1	Beeketing	3,984	74 ms
2	RD Station	6,545	76 ms
3	iZooto	1,370	83 ms
4	Ve	1,848	149 ms
5	Listrak	1,073	154 ms
6	Hubspot	33,125	181 ms
7	Yotpo	13,629	202 ms
8	Mailchimp	23,373	204 ms
9	OptinMonster	7,493	260 ms
10	Bronto Software	1,056	262 ms
11	Pardot	1,435	404 ms
12	Albacross	1,920	490 ms
13	Sumo	18,438	686 ms
14	Bigcommerce	10,096	976 ms
15	Drift	6,565	1279 ms
16	Judge.me	8,307	1375 ms
17	PureCars	2,697	1901 ms
18	Tray Commerce	3,173	2328 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	1,083	59 ms
2	Pure Chat	4,661	70 ms
3	Foursixty	1,411	81 ms
4	LivePerson	4,302	112 ms
5	iPerceptions	1,992	132 ms
6	Comm100	1,321	134 ms
7	Intercom	15,656	245 ms
8	Help Scout	2,183	258 ms
9	Tidio Live Chat	12,655	383 ms
10	Tawk.to	63,460	405 ms
11	LiveChat	19,468	411 ms
12	ContactAtOnce	3,247	491 ms
13	Jivochat	45,110	553 ms
14	Olark	6,903	656 ms
15	Smartsupp	14,862	782 ms
16	ZenDesk	69,488	892 ms

Content & Publishing

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

Rank	Name	Usage	Average Impact
1	Research Online	2,222	62 ms
2	Accuweather	1,491	72 ms
3	Booking.com	1,656	157 ms
4	Tencent	2,257	163 ms
5	OpenTable	1,563	165 ms
6	SnapWidget	2,607	174 ms
7	Covert Pics	1,007	184 ms
8	AMP	74,549	308 ms
9	Medium	1,157	474 ms
10	Embedly	5,513	514 ms
11	Spotify	3,225	602 ms
12	issuu	1,934	670 ms
13	SoundCloud	4,464	986 ms
14	Dailymotion	1,838	1244 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	Bootstrap CDN	1,445	55 ms
2	Adobe TypeKit	18,274	94 ms
3	Yandex CDN	1,572	184 ms
4	JSDelivr CDN	97,319	193 ms
5	Microsoft Hosted Libs	4,941	204 ms
6	Monotype	4,073	212 ms
7	Azure Web Services	10,575	225 ms
8	jQuery CDN	167,533	269 ms
9	Unpkg	6,922	274 ms
10	Google CDN	947,402	288 ms
11	Akamai	7,316	336 ms
12	Cloudflare CDN	117,287	339 ms
13	FontAwesome CDN	47,278	413 ms
14	CreateJS CDN	3,516	2323 ms

Tag Management

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

Rank	Name	Usage	Average Impact
1	Google Tag Manager	721,295	115 ms
2	TagCommander	1,072	145 ms
3	BrightTag / Signal	3,666	158 ms
4	Adobe Tag Manager	32,466	311 ms
5	Tealium	12,103	362 ms
6	Ensighten	3,761	444 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	1,241	70 ms
2	Amazon Web Services	38,265	161 ms
3	All Other 3rd Parties	1,380,545	318 ms
4	Parking Crew	5,147	326 ms
5	Heroku	2,002	607 ms
6	uLogin	2,316	1223 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/Doubleclick Ads	680,948	991,570 s	1456 ms
All Other 3rd Parties	1,380,545	438,448 s	318 ms
YouTube	408,326	346,661 s	849 ms
Facebook	1,461,331	334,392 s	229 ms
Wix	54,909	327,376 s	5962 ms
Google CDN	947,402	272,512 s	288 ms
Yandex Metrica	292,542	169,622 s	580 ms
Google Maps	267,417	138,999 s	520 ms
Shopify	107,323	113,506 s	1058 ms
Other Google APIs/SDKs	580,415	97,529 s	168 ms
Google Analytics	1,200,666	92,871 s	77 ms
Google Tag Manager	721,295	83,294 s	115 ms
ZenDesk	69,488	62,011 s	892 ms
AddThis	118,289	47,729 s	403 ms
jQuery CDN	167,533	45,063 s	269 ms
Cloudflare CDN	117,287	39,767 s	339 ms
WordPress	92,546	37,424 s	404 ms
Squarespace	39,492	35,967 s	911 ms
Twitter	213,911	29,771 s	139 ms
Yandex APIs	27,480	29,681 s	1080 ms
Tawk.to	63,460	25,679 s	405 ms
Jivochat	45,110	24,937 s	553 ms
Cloudflare	53,319	24,772 s	465 ms
PIXNET	15,434	23,272 s	1508 ms
AMP	74,549	22,928 s	308 ms
POWr	16,407	22,375 s	1364 ms
Hatena Blog	13,205	20,853 s	1579 ms
FontAwesome CDN	47,278	19,542 s	413 ms
Weebly	13,271	19,021 s	1433 ms
JSDelivr CDN	97,319	18,827 s	193 ms
Pubmatic	52,613	16,557 s	315 ms
Tumblr	7,972	16,326 s	2048 ms
Hotjar	177,468	14,877 s	84 ms
Criteo	62,125	14,701 s	237 ms
Sumo	18,438	12,647 s	686 ms
Wistia	13,083	12,145 s	928 ms
Smartsupp	14,862	11,628 s	782 ms
Judge.me	8,307	11,424 s	1375 ms
Bridgewell DSP	14,079	11,133 s	791 ms
Adobe Tag Manager	32,466	10,104 s	311 ms
Bigcommerce	10,096	9,854 s	976 ms
ShareThis	40,133	9,398 s	234 ms
Stripe	23,538	9,143 s	388 ms
Taboola	24,583	8,950 s	364 ms
Drift	6,565	8,400 s	1279 ms
Integral Ad Science	8,013	8,241 s	1028 ms
CreateJS CDN	3,516	8,169 s	2323 ms
Yandex Ads	25,906	8,113 s	313 ms
Esri ArcGIS	1,692	8,036 s	4750 ms
LiveChat	19,468	8,001 s	411 ms
Blogger	23,674	7,742 s	327 ms
Tray Commerce	3,173	7,388 s	2328 ms
Sentry	9,061	6,480 s	715 ms
Amazon Web Services	38,265	6,159 s	161 ms
Hubspot	33,125	6,001 s	181 ms
Tilda	7,842	5,858 s	747 ms
Klaviyo	14,593	5,713 s	392 ms
Adroll	47,959	5,625 s	117 ms
Moat	6,862	5,604 s	817 ms
Snapchat	13,344	5,466 s	410 ms
CDK Dealer Management	3,429	5,376 s	1568 ms
Brightcove	6,615	5,352 s	809 ms
Rambler	7,698	5,318 s	691 ms
Adloox	5,759	5,306 s	921 ms
PayPal	15,436	5,286 s	342 ms
Salesforce	10,892	5,206 s	478 ms
PureCars	2,697	5,127 s	1901 ms
Media.net	14,529	4,949 s	341 ms
Bugsnag	8,686	4,945 s	569 ms
Histats	13,537	4,884 s	361 ms
LiveJournal	3,680	4,882 s	1327 ms
Tidio Live Chat	12,655	4,849 s	383 ms
AB Tasty	3,010	4,798 s	1594 ms
Mailchimp	23,373	4,766 s	204 ms
MGID	8,210	4,716 s	574 ms
GoDaddy	6,687	4,678 s	700 ms
Mapbox	5,206	4,568 s	877 ms
Olark	6,903	4,528 s	656 ms
Yandex Share	24,181	4,455 s	184 ms
SoundCloud	4,464	4,404 s	986 ms
Tealium	12,103	4,385 s	362 ms
Optimizely	19,583	4,375 s	223 ms
MediaVine	6,490	4,251 s	655 ms
Privy	13,047	4,036 s	309 ms
fam	2,135	3,857 s	1807 ms
Intercom	15,656	3,829 s	245 ms
Dealer	8,637	3,737 s	433 ms
Lucky Orange	7,529	3,699 s	491 ms
Vimeo	10,403	3,689 s	355 ms
Rubicon Project	39,353	3,558 s	90 ms
WebsiteBuilder.com	738	3,441 s	4663 ms
mPulse	13,177	3,243 s	246 ms
Adobe Business Catalyst	3,181	3,089 s	971 ms
Cookiebot	20,838	3,062 s	147 ms
Kakao	18,109	2,853 s	158 ms
uLogin	2,316	2,832 s	1223 ms
Embedly	5,513	2,831 s	514 ms
Yotpo	13,629	2,754 s	202 ms
WordAds	18,478	2,745 s	149 ms
Amazon Ads	25,338	2,710 s	107 ms
Skimbit	15,819	2,647 s	167 ms
Trust Pilot	15,202	2,488 s	164 ms
Akamai	7,316	2,455 s	336 ms
Azure Web Services	10,575	2,377 s	225 ms
Permutive	9,556	2,326 s	243 ms
Dailymotion	1,838	2,287 s	1244 ms
VigLink	7,097	2,191 s	309 ms
Infolinks	3,699	2,143 s	579 ms
AddToAny	24,490	2,119 s	87 ms
Twitch	1,068	2,025 s	1896 ms
Inspectlet	5,605	2,022 s	361 ms
Tynt	22,558	1,960 s	87 ms
OptinMonster	7,493	1,950 s	260 ms
Spotify	3,225	1,943 s	602 ms
LKQD	1,335	1,935 s	1449 ms
Unpkg	6,922	1,896 s	274 ms
Bold Commerce	13,095	1,885 s	144 ms
Hotmart	810	1,878 s	2318 ms
Fastly	6,694	1,841 s	275 ms
Bing Ads	15,786	1,838 s	116 ms
Segment	9,541	1,825 s	191 ms
Instagram	9,441	1,734 s	184 ms
Adobe TypeKit	18,274	1,723 s	94 ms
DTSCOUT	12,679	1,678 s	132 ms
Parking Crew	5,147	1,677 s	326 ms
Ensighten	3,761	1,668 s	444 ms
VK	13,473	1,631 s	121 ms
ContactAtOnce	3,247	1,594 s	491 ms
iubenda	12,781	1,586 s	124 ms
LinkedIn	14,038	1,559 s	111 ms
Sizmek	1,484	1,554 s	1047 ms
Pinterest	17,218	1,536 s	89 ms
Signyfyd	1,691	1,466 s	867 ms
FullStory	7,654	1,408 s	184 ms
Gigya	2,261	1,310 s	579 ms
issuu	1,934	1,295 s	670 ms
Adform	6,772	1,279 s	189 ms
LongTail Ad Solutions	3,433	1,252 s	365 ms
Disqus	1,252	1,245 s	994 ms
New Relic	13,062	1,242 s	95 ms
Heroku	2,002	1,216 s	607 ms
Nielsen NetRatings SiteCensus	11,805	1,204 s	102 ms
Secomapp	2,150	1,174 s	546 ms
Baidu Analytics	10,739	1,141 s	106 ms
Okas Concepts	673	1,112 s	1652 ms
Dynamic Yield	964	1,095 s	1136 ms
LoyaltyLion	1,300	1,079 s	830 ms
Yahoo!	6,183	1,062 s	172 ms
Sekindo	376	1,054 s	2804 ms
Ecwid	1,399	1,033 s	739 ms
Optanon	8,025	1,028 s	128 ms
Microsoft Hosted Libs	4,941	1,006 s	204 ms
Amazon Pay	5,751	974 s	169 ms
DoubleVerify	1,772	970 s	548 ms
DigiTrust	485	969 s	1999 ms
Albacross	1,920	941 s	490 ms
Intent Media	8,019	931 s	116 ms
Salesforce Commerce Cloud	2,623	897 s	342 ms
sovrn	4,673	890 s	190 ms
Monotype	4,073	862 s	212 ms
Outbrain	8,189	854 s	104 ms
Kaltura Video Platform	506	852 s	1684 ms
Feefo.com	1,686	846 s	502 ms
Technorati	830	822 s	991 ms
Cxense	4,374	783 s	179 ms
Ezoic	1,329	773 s	582 ms
VWO	4,724	748 s	158 ms
Bazaarvoice	1,845	732 s	397 ms
33 Across	1,188	730 s	615 ms
AdMatic	793	719 s	906 ms
Vidible	1,146	716 s	625 ms
CallRail	7,019	710 s	101 ms
Revolver Maps	1,144	697 s	609 ms
Yieldify	513	683 s	1332 ms
AppDynamics	1,281	675 s	527 ms
Admixer for Publishers	1,043	669 s	642 ms
RevJet	1,210	665 s	550 ms
Index Exchange	4,946	655 s	133 ms
Smart AdServer	5,189	654 s	126 ms
StickyADS.tv	838	650 s	776 ms
SocialShopWave	2,044	617 s	302 ms
Teads	3,457	612 s	177 ms
Scorecard Research	6,956	600 s	86 ms
Vidyard	536	587 s	1094 ms
LINE Corporation	5,182	585 s	113 ms
OpenX	3,015	583 s	193 ms
Fraudlogix	2,244	580 s	258 ms
Pardot	1,435	579 s	404 ms
BrightTag / Signal	3,666	578 s	158 ms
ZEDO	794	576 s	726 ms
Mixpanel	7,513	567 s	75 ms
Help Scout	2,183	563 s	258 ms
Snowplow	5,845	555 s	95 ms
TINT	224	553 s	2470 ms
Crazy Egg	4,988	551 s	110 ms
Medium	1,157	549 s	474 ms
IBM Digital Analytics	806	546 s	677 ms
piano	1,183	543 s	459 ms
RD Station	6,545	496 s	76 ms
LivePerson	4,302	484 s	112 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.json5 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.json5. 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

The queries used to compute the data are in the sql/ directory.

1. Edit all-observed-domains-query.sql to query the correct month's HTTPArchive run.
2. Run all-observed-domains-query.sql in BigQuery.
3. Download the results and check them in at data/YYYY-MM-01-observed-domains.json.
4. Edit bootup-time-scripting.partial.sql to query the correct month's HTTPArchive run.
5. Run origin-query.generated.sql in BigQuery.
6. Download the results and check them in at data/YYYY-MM-01-origin-scripting.json.
7. Run yarn build to regenerate the latest canonical domain mapping.
8. Create a new table in lighthouse-infrastructure.third_party_web BigQuery table of the format YYYY_MM_01 with the csv in dist/domain-map.csv with three columns domain, canonicalDomain, and category.
9. Edit bootup-time-scripting.partial.sql to join on the table you just created.
10. Run yarn build to regenerate the queries.
11. Run entity-per-page.generated.sql in BigQuery.
12. Download the results and check them in at data/YYYY-MM-01-entity-scripting.json.
13. Run web-almanac-all-observed-domains-identification.sql in BigQuery.
14. Save the results to a BigQuery table YYYY_MM_01_all_observed_domains.

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.