Third Party Web

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. Libraries
      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. Twice a 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	ExoClick	2,714	34 ms
2	Tribal Fusion	1,082	54 ms
3	Rubicon Project	3,295	62 ms
4	Gemius	6,998	69 ms
5	BlueKai	2,548	71 ms
6	Crowd Control	2,553	74 ms
7	MailMunch	4,315	77 ms
8	fluct	6,732	79 ms
9	Geniee	2,226	81 ms
10	Rakuten Marketing	1,540	83 ms
11	PubNation	2,499	88 ms
12	Unbounce	2,338	95 ms
13	Outbrain	5,244	98 ms
14	Constant Contact	1,251	101 ms
15	Scorecard Research	10,755	101 ms
16	PushCrew	3,335	101 ms
17	SmartAdServer	1,776	102 ms
18	OwnerIQ	1,541	110 ms
19	Digital ad Consortium	3,777	117 ms
20	AudienceSearch	4,389	117 ms
21	Adroll	3,188	119 ms
22	Smart AdServer	3,223	121 ms
23	Popads	4,628	122 ms
24	TrafficStars	1,093	122 ms
25	Amazon Ads	16,853	127 ms
26	DTSCOUT	7,417	130 ms
27	Adocean	1,319	136 ms
28	Adverline Board	1,307	137 ms
29	Yahoo!	3,830	138 ms
30	Pubmatic	3,728	145 ms
31	Skimbit	15,074	146 ms
32	Microad	1,328	149 ms
33	Chitika	1,010	150 ms
34	Cxense	3,773	153 ms
35	JustUno	1,944	154 ms
36	Tynt	25,583	154 ms
37	Adform	9,062	155 ms
38	Criteo	69,887	156 ms
39	Rocket Fuel	5,755	161 ms
40	JuicyAds	2,935	163 ms
41	Sharethrough	2,195	170 ms
42	AOL / Oath / Verizon Media	1,341	171 ms
43	sovrn	5,371	172 ms
44	Klaviyo	7,677	181 ms
45	Teads	6,589	187 ms
46	Index Exchange	3,336	196 ms
47	MGID	3,438	205 ms
48	AppNexus	2,568	221 ms
49	Sortable	1,028	252 ms
50	iBillboard	3,258	272 ms
51	Admixer for Publishers	2,597	280 ms
52	VigLink	5,806	325 ms
53	Privy	9,952	329 ms
54	Sizmek	3,971	428 ms
55	Taboola	13,502	468 ms
56	Yandex Ads	23,195	501 ms
57	Infolinks	4,090	524 ms
58	GumGum	4,172	589 ms
59	Between Digital	1,107	600 ms
60	WordAds	5,559	687 ms
61	Vidible	1,566	746 ms
62	AdMatic	2,707	759 ms
63	OpenX	6,882	855 ms
64	LKQD	2,090	885 ms
65	MediaVine	4,296	961 ms
66	Media.net	3,385	1030 ms
67	Integral Ad Science	8,575	1077 ms
68	Moat	11,662	1134 ms
69	Yieldmo	2,227	1235 ms
70	DoubleVerify	1,372	1248 ms
71	Google/Doubleclick Ads	624,172	1285 ms
72	StickyADS.tv	2,010	1292 ms
73	33 Across	5,937	1736 ms
74	fam	2,326	1783 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	Alexa	1,209	56 ms
2	etracker	1,732	71 ms
3	Roxr Software	1,822	73 ms
4	Heap	1,859	75 ms
5	SessionCam	1,131	77 ms
6	Trust Pilot	2,741	77 ms
7	Mixpanel	4,488	84 ms
8	Google Analytics	1,124,001	86 ms
9	Searchanise	2,752	92 ms
10	Chartbeat	6,959	96 ms
11	Baidu Analytics	7,766	102 ms
12	Hotjar	111,933	104 ms
13	CallRail	3,843	109 ms
14	Quantcast	3,728	111 ms
15	Marchex	3,844	113 ms
16	Nosto	2,973	114 ms
17	Clicktale	2,351	118 ms
18	ForeSee	2,612	124 ms
19	Parse.ly	2,831	126 ms
20	Snowplow	5,357	126 ms
21	Treasure Data	9,714	131 ms
22	Nielsen NetRatings SiteCensus	15,441	141 ms
23	Evidon	1,208	142 ms
24	Gigya	1,949	176 ms
25	Bazaarvoice	3,285	184 ms
26	Snapchat	6,233	186 ms
27	Maxymiser	1,139	189 ms
28	BounceX	1,374	190 ms
29	DigiTrust	4,583	197 ms
30	Segment	7,886	198 ms
31	VWO	3,280	211 ms
32	FullStory	4,063	218 ms
33	Ezoic	3,016	241 ms
34	Feefo.com	2,218	251 ms
35	Optimizely	12,417	267 ms
36	Inspectlet	4,984	320 ms
37	Yandex Metrica	242,224	376 ms
38	Keen	3,241	384 ms
39	mPulse	1,013	415 ms
40	AB Tasty	3,111	455 ms
41	Histats	13,398	467 ms
42	Mouseflow	1,391	569 ms
43	Salesforce	20,689	577 ms
44	Lucky Orange	6,691	903 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	Kakao	8,746	83 ms
2	Instagram	5,167	85 ms
3	VK	7,315	86 ms
4	Micropat	22,116	89 ms
5	Pinterest	15,513	114 ms
6	LinkedIn	13,763	123 ms
7	Facebook	1,014,407	142 ms
8	Twitter	259,833	172 ms
9	Yandex Share	22,930	173 ms
10	ShareThis	18,767	443 ms
11	SocialShopWave	1,023	448 ms
12	Shareaholic	9,988	471 ms
13	AddThis	122,103	497 ms
14	LiveJournal	6,610	734 ms
15	PIXNET	26,582	925 ms
16	Tumblr	8,675	1499 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	YouTube	30,547	156 ms
2	Brightcove	5,100	721 ms
3	Wistia	10,643	761 ms

Developer Utilities

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

Rank	Name	Usage	Average Impact
1	Trusted Shops	1,322	40 ms
2	Symantec	1,246	69 ms
3	Stripe	4,869	81 ms
4	New Relic	3,340	81 ms
5	Siteimprove	1,481	82 ms
6	iubenda	9,614	83 ms
7	GetSiteControl	3,144	84 ms
8	iovation	1,009	85 ms
9	OneSignal	9,567	87 ms
10	Cookiebot	9,516	93 ms
11	Bold Commerce	11,530	127 ms
12	Sift Science	1,117	145 ms
13	AppDynamics	1,496	149 ms
14	MaxCDN Enterprise	2,325	170 ms
15	Seznam	1,424	173 ms
16	Swiftype	1,300	177 ms
17	Other Google APIs/SDKs	279,510	195 ms
18	Fastly	3,396	225 ms
19	Affirm	1,067	245 ms
20	Rambler	8,226	249 ms
21	Cloudflare	8,628	272 ms
22	Google Maps	120,242	312 ms
23	Secomapp	1,062	341 ms
24	PayPal	8,329	384 ms
25	Datacamp	10,609	425 ms
26	Sentry	15,661	462 ms
27	Distil Networks	10,893	486 ms
28	Okas Concepts	1,109	573 ms
29	Mapbox	2,558	1215 ms
30	Yandex APIs	21,677	1231 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	10,705	64 ms
2	WordPress	77,990	125 ms
3	Weebly	35,308	322 ms
4	Dealer	7,762	628 ms
5	Shopify	70,464	637 ms
6	Squarespace	36,919	1133 ms
7	CDK Dealer Management	3,766	1149 ms
8	Hatena Blog	18,689	1315 ms
9	Wix	40,752	5393 ms

Marketing

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

Rank	Name	Usage	Average Impact
1	RD Station	3,457	76 ms
2	Hubspot	14,461	119 ms
3	Listrak	1,070	145 ms
4	Ve	3,415	157 ms
5	Drift	5,072	163 ms
6	Yotpo	9,652	206 ms
7	Mailchimp	17,626	223 ms
8	OptinMonster	6,239	297 ms
9	Bigcommerce	11,802	301 ms
10	Beeketing	19,146	465 ms
11	Albacross	1,737	753 ms
12	Sumo	20,402	798 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	Foursixty	1,129	82 ms
2	iPerceptions	2,648	88 ms
3	iAdvize SAS	2,584	100 ms
4	LivePerson	4,547	114 ms
5	Comm100	1,539	119 ms
6	LiveChat	10,423	154 ms
7	Pure Chat	4,086	162 ms
8	Tidio Live Chat	5,979	309 ms
9	Dynamic Yield	1,773	340 ms
10	Tawk.to	46,981	343 ms
11	Jivochat	28,139	360 ms
12	LiveTex	2,673	371 ms
13	Help Scout	1,626	372 ms
14	Intercom	13,452	500 ms
15	Olark	7,372	636 ms
16	ZenDesk	68,127	698 ms

Content & Publishing

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

Rank	Name	Usage	Average Impact
1	Accuweather	1,279	77 ms
2	OpenTable	1,845	107 ms
3	Medium	2,491	171 ms
4	Embedly	2,686	227 ms
5	AMP	46,495	349 ms

Libraries

These are mostly open source libraries (e.g. jQuery) served over different public CDNs. 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 libraries being served from that origin are lighter/heavier than the ones served by another.

Rank	Name	Usage	Average Impact
1	Adobe TypeKit	10,409	92 ms
2	Yandex CDN	1,939	155 ms
3	FontAwesome CDN	18,935	162 ms
4	Microsoft Hosted Libs	4,876	185 ms
5	Monotype	4,142	194 ms
6	jQuery CDN	147,162	227 ms
7	Google CDN	749,555	247 ms
8	Unpkg	2,947	251 ms
9	Cloudflare CDN	90,131	260 ms
10	JSDelivr CDN	23,200	336 ms
11	CreateJS CDN	1,713	3617 ms

Tag Management

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

Rank	Name	Usage	Average Impact
1	TagCommander	1,213	96 ms
2	Google Tag Manager	481,374	115 ms
3	BrightTag / Signal	7,380	134 ms
4	Tealium	11,573	305 ms
5	Adobe Tag Manager	27,224	334 ms
6	Ensighten	5,840	390 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	Amazon Web Services	27,904	165 ms
2	Pagely	1,047	234 ms
3	All Other 3rd Parties	913,172	332 ms
4	Parking Crew	4,690	425 ms
5	uLogin	2,451	1211 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	624,172	801,894 s	1285 ms
All Other 3rd Parties	913,172	302,947 s	332 ms
Wix	40,752	219,788 s	5393 ms
Google CDN	749,555	184,832 s	247 ms
Facebook	1,014,407	144,422 s	142 ms
Google Analytics	1,124,001	96,913 s	86 ms
Yandex Metrica	242,224	91,128 s	376 ms
AddThis	122,103	60,692 s	497 ms
Google Tag Manager	481,374	55,417 s	115 ms
Other Google APIs/SDKs	279,510	54,369 s	195 ms
ZenDesk	68,127	47,535 s	698 ms
Shopify	70,464	44,901 s	637 ms
Twitter	259,833	44,660 s	172 ms
Squarespace	36,919	41,812 s	1133 ms
Google Maps	120,242	37,497 s	312 ms
jQuery CDN	147,162	33,468 s	227 ms
Yandex APIs	21,677	26,687 s	1231 ms
PIXNET	26,582	24,586 s	925 ms
Hatena Blog	18,689	24,584 s	1315 ms
Cloudflare CDN	90,131	23,395 s	260 ms
Sumo	20,402	16,274 s	798 ms
AMP	46,495	16,225 s	349 ms
Tawk.to	46,981	16,092 s	343 ms
Moat	11,662	13,229 s	1134 ms
Tumblr	8,675	13,004 s	1499 ms
Salesforce	20,689	11,934 s	577 ms
Hotjar	111,933	11,672 s	104 ms
Yandex Ads	23,195	11,612 s	501 ms
Weebly	35,308	11,363 s	322 ms
Criteo	69,887	10,883 s	156 ms
33 Across	5,937	10,306 s	1736 ms
Jivochat	28,139	10,136 s	360 ms
WordPress	77,990	9,710 s	125 ms
Integral Ad Science	8,575	9,236 s	1077 ms
Adobe Tag Manager	27,224	9,105 s	334 ms
Beeketing	19,146	8,897 s	465 ms
ShareThis	18,767	8,309 s	443 ms
Wistia	10,643	8,098 s	761 ms
JSDelivr CDN	23,200	7,801 s	336 ms
Sentry	15,661	7,237 s	462 ms
Intercom	13,452	6,729 s	500 ms
Taboola	13,502	6,317 s	468 ms
Histats	13,398	6,255 s	467 ms
CreateJS CDN	1,713	6,196 s	3617 ms
Lucky Orange	6,691	6,042 s	903 ms
OpenX	6,882	5,886 s	855 ms
Distil Networks	10,893	5,291 s	486 ms
Dealer	7,762	4,873 s	628 ms
LiveJournal	6,610	4,850 s	734 ms
YouTube	30,547	4,769 s	156 ms
Shareaholic	9,988	4,704 s	471 ms
Olark	7,372	4,690 s	636 ms
Amazon Web Services	27,904	4,618 s	165 ms
Datacamp	10,609	4,505 s	425 ms
CDK Dealer Management	3,766	4,327 s	1149 ms
fam	2,326	4,146 s	1783 ms
MediaVine	4,296	4,127 s	961 ms
Yandex Share	22,930	3,965 s	173 ms
Tynt	25,583	3,952 s	154 ms
Mailchimp	17,626	3,924 s	223 ms
WordAds	5,559	3,817 s	687 ms
Brightcove	5,100	3,677 s	721 ms
Bigcommerce	11,802	3,550 s	301 ms
Tealium	11,573	3,526 s	305 ms
Media.net	3,385	3,485 s	1030 ms
Optimizely	12,417	3,314 s	267 ms
Privy	9,952	3,274 s	329 ms
PayPal	8,329	3,197 s	384 ms
Mapbox	2,558	3,107 s	1215 ms
FontAwesome CDN	18,935	3,059 s	162 ms
uLogin	2,451	2,969 s	1211 ms
Yieldmo	2,227	2,750 s	1235 ms
StickyADS.tv	2,010	2,598 s	1292 ms
GumGum	4,172	2,455 s	589 ms
Cloudflare	8,628	2,343 s	272 ms
Ensighten	5,840	2,280 s	390 ms
Skimbit	15,074	2,207 s	146 ms
Nielsen NetRatings SiteCensus	15,441	2,174 s	141 ms
Infolinks	4,090	2,144 s	524 ms
Amazon Ads	16,853	2,142 s	127 ms
AdMatic	2,707	2,055 s	759 ms
Rambler	8,226	2,050 s	249 ms
Parking Crew	4,690	1,992 s	425 ms
Yotpo	9,652	1,991 s	206 ms
Micropat	22,116	1,965 s	89 ms
Blindado	802	1,954 s	2437 ms
VigLink	5,806	1,886 s	325 ms
OptinMonster	6,239	1,855 s	297 ms
LKQD	2,090	1,850 s	885 ms
Tidio Live Chat	5,979	1,849 s	309 ms
Pinterest	15,513	1,762 s	114 ms
Hubspot	14,461	1,722 s	119 ms
DoubleVerify	1,372	1,712 s	1248 ms
Sizmek	3,971	1,700 s	428 ms
LinkedIn	13,763	1,695 s	123 ms
LiveChat	10,423	1,602 s	154 ms
Inspectlet	4,984	1,594 s	320 ms
Segment	7,886	1,562 s	198 ms
Bold Commerce	11,530	1,465 s	127 ms
AB Tasty	3,111	1,416 s	455 ms
Adform	9,062	1,408 s	155 ms
Klaviyo	7,677	1,391 s	181 ms
Albacross	1,737	1,308 s	753 ms
Treasure Data	9,714	1,277 s	131 ms
Keen	3,241	1,245 s	384 ms
Teads	6,589	1,235 s	187 ms
Vidible	1,566	1,169 s	746 ms
Snapchat	6,233	1,162 s	186 ms
Scorecard Research	10,755	1,090 s	101 ms
LiveTex	2,673	993 s	371 ms
BrightTag / Signal	7,380	989 s	134 ms
DTSCOUT	7,417	967 s	130 ms
Adobe TypeKit	10,409	955 s	92 ms
Rocket Fuel	5,755	926 s	161 ms
sovrn	5,371	922 s	172 ms
DigiTrust	4,583	903 s	197 ms
Microsoft Hosted Libs	4,876	901 s	185 ms
FullStory	4,063	887 s	218 ms
Cookiebot	9,516	886 s	93 ms
iBillboard	3,258	885 s	272 ms
OneSignal	9,567	835 s	87 ms
Drift	5,072	827 s	163 ms
Monotype	4,142	805 s	194 ms
iubenda	9,614	799 s	83 ms
Baidu Analytics	7,766	792 s	102 ms
Mouseflow	1,391	791 s	569 ms
Esri ArcGIS	731	782 s	1070 ms
Fastly	3,396	764 s	225 ms
Unpkg	2,947	740 s	251 ms
Ezoic	3,016	727 s	241 ms
Admixer for Publishers	2,597	726 s	280 ms
Kakao	8,746	724 s	83 ms
MGID	3,438	704 s	205 ms
Hotmart	855	693 s	811 ms
VWO	3,280	690 s	211 ms
Blogger	10,705	690 s	64 ms
Snowplow	5,357	676 s	126 ms
Chartbeat	6,959	671 s	96 ms
Between Digital	1,107	664 s	600 ms
Pure Chat	4,086	662 s	162 ms
Index Exchange	3,336	654 s	196 ms
Okas Concepts	1,109	635 s	573 ms
VK	7,315	629 s	86 ms
Embedly	2,686	611 s	227 ms
Help Scout	1,626	605 s	372 ms
Dynamic Yield	1,773	603 s	340 ms
Bazaarvoice	3,285	603 s	184 ms
Cxense	3,773	579 s	153 ms
AppNexus	2,568	568 s	221 ms
Popads	4,628	564 s	122 ms
Feefo.com	2,218	556 s	251 ms
Pubmatic	3,728	541 s	145 ms
Ve	3,415	538 s	157 ms
fluct	6,732	532 s	79 ms
Yahoo!	3,830	527 s	138 ms
LivePerson	4,547	517 s	114 ms
Outbrain	5,244	514 s	98 ms
AudienceSearch	4,389	514 s	117 ms
IBM Digital Analytics	873	513 s	587 ms
Meetrics	881	506 s	575 ms
Gemius	6,998	485 s	69 ms
JuicyAds	2,935	478 s	163 ms
SocialShopWave	1,023	459 s	448 ms
Digital ad Consortium	3,777	440 s	117 ms
Instagram	5,167	440 s	85 ms
Marchex	3,844	435 s	113 ms
Market GID	966	432 s	447 ms
Pictela (AOL)	785	431 s	550 ms
Medium	2,491	427 s	171 ms
Audience 360	413	423 s	1024 ms
Adtech (AOL)	509	421 s	828 ms
mPulse	1,013	420 s	415 ms
CallRail	3,843	419 s	109 ms
Quantcast	3,728	415 s	111 ms
MaxCDN Enterprise	2,325	395 s	170 ms
Stripe	4,869	394 s	81 ms
WebpageFX	329	394 s	1199 ms
Smart AdServer	3,223	390 s	121 ms
Adroll	3,188	381 s	119 ms
Mixpanel	4,488	378 s	84 ms
Sharethrough	2,195	373 s	170 ms
Radar	670	367 s	548 ms
Secomapp	1,062	362 s	341 ms
Sekindo	219	359 s	1640 ms
Parse.ly	2,831	356 s	126 ms
Gigya	1,949	342 s	176 ms
Disqus	785	340 s	434 ms
Nosto	2,973	339 s	114 ms
PushCrew	3,335	338 s	101 ms
MailMunch	4,315	331 s	77 ms
Bugsnag	843	331 s	393 ms
ForeSee	2,612	325 s	124 ms
Yandex CDN	1,939	300 s	155 ms
JustUno	1,944	299 s	154 ms
Kaltura Video Platform	440	294 s	668 ms
Digioh	844	281 s	333 ms
Clicktale	2,351	278 s	118 ms
New Relic	3,340	272 s	81 ms
Best Of Media S.A.	254	267 s	1051 ms
GetSiteControl	3,144	263 s	84 ms
RD Station	3,457	262 s	76 ms
Affirm	1,067	262 s	245 ms
BounceX	1,374	261 s	190 ms
Sortable	1,028	259 s	252 ms
iAdvize SAS	2,584	259 s	100 ms
Hola Networks	151	255 s	1690 ms
Vox Media	340	254 s	747 ms
Searchanise	2,752	252 s	92 ms
Seznam	1,424	247 s	173 ms
Pagely	1,047	245 s	234 ms
iPerceptions	2,648	232 s	88 ms
Perfect Market	781	230 s	295 ms
Swiftype	1,300	230 s	177 ms
UserReport	987	230 s	233 ms
Ecwid	609	229 s	377 ms
AOL / Oath / Verizon Media	1,341	229 s	171 ms
PhotoBucket	737	226 s	306 ms
AppDynamics	1,496	224 s	149 ms
Cedato	103	222 s	2159 ms
Unbounce	2,338	222 s	95 ms
PubNation	2,499	221 s	88 ms
Decibel Insight	521	217 s	417 ms
Ooyala	657	216 s	329 ms
Maxymiser	1,139	216 s	189 ms
Pixlee	337	212 s	630 ms
Trust Pilot	2,741	211 s	77 ms
Media Math	604	210 s	348 ms
ShopiMind	310	209 s	674 ms
PerimeterX Bot Defender	209	208 s	997 ms
Expedia	627	208 s	332 ms
Rubicon Project	3,295	204 s	62 ms
Fraudlogix	974	204 s	209 ms
SearchSpring	529	204 s	385 ms
Trip Advisor	346	198 s	572 ms
Microad	1,328	198 s	149 ms
OpenTable	1,845	197 s	107 ms
Opentag	976	197 s	202 ms
Signyfyd	233	195 s	835 ms
Celtra	565	191 s	339 ms
Media Management Technologies	533	191 s	358 ms
Crowd Control	2,553	188 s	74 ms
Comm100	1,539	184 s	119 ms
BlueKai	2,548	181 s	71 ms
Wishpond Technologies	432	181 s	419 ms
SmartAdServer	1,776	181 s	102 ms
Geniee	2,226	181 s	81 ms
Adocean	1,319	180 s	136 ms
Adverline Board	1,307	179 s	137 ms
Evidon	1,208	171 s	142 ms
smartclip	367	171 s	465 ms
Connatix	191	170 s	891 ms
OwnerIQ	1,541	170 s	110 ms
Opta	294	169 s	575 ms
GitHub	731	167 s	228 ms
LoopMe	441	166 s	375 ms
Booking.com	978	165 s	169 ms
Sift Science	1,117	162 s	145 ms
Qubit Deliver	354	159 s	450 ms
ThreatMetrix	184	158 s	858 ms
Listrak	1,070	155 s	145 ms
Chitika	1,010	152 s	150 ms
[24]7	137	151 s	1100 ms
Freshdesk	898	141 s	157 ms
IPONWEB	929	140 s	151 ms
Heap	1,859	140 s	75 ms
TrafficStars	1,093	134 s	122 ms
Digital Media Exchange	271	133 s	490 ms
Roxr Software	1,822	132 s	73 ms
SpotXchange	593	129 s	218 ms
AddShoppers	841	128 s	153 ms
Rakuten Marketing	1,540	128 s	83 ms
PERFORM	459	127 s	276 ms
Constant Contact	1,251	126 s	101 ms
Monetate	939	124 s	132 ms
etracker	1,732	123 s	71 ms
Zmags	263	123 s	467 ms
Siteimprove	1,481	122 s	82 ms
Fort Awesome	529	122 s	230 ms
Stackla PTY	537	120 s	224 ms
One by AOL	801	119 s	149 ms
PowerReviews	675	119 s	177 ms
FirstImpression	278	119 s	428 ms
Clerk.io ApS	736	117 s	159 ms
Flowplayer	492	117 s	237 ms
TagCommander	1,213	116 s	96 ms
Smarter Click	430	116 s	269 ms
MonetizeMore	109	113 s	1038 ms
Fanplayr	144	109 s	754 ms
Technorati	814	108 s	133 ms
AvantLink	126	106 s	837 ms
OptiMonk	930	105 s	113 ms
Mather Economics	558	104 s	187 ms
eBay	615	104 s	169 ms
Mobify	327	103 s	316 ms
Convert Insights	917	103 s	112 ms
Adnium	432	102 s	237 ms
ZEDO	401	102 s	254 ms
Picreel	547	101 s	185 ms
Bronto Software	900	100 s	112 ms
Accuweather	1,279	99 s	77 ms
WisePops	417	98 s	236 ms
Interpublic Group	486	98 s	202 ms
Shopgate	772	98 s	127 ms
Livefyre	481	97 s	201 ms
Polar Mobile Group	497	95 s	192 ms
Skype	740	95 s	128 ms
Adyoulike	696	95 s	136 ms
Pixalate	327	94 s	286 ms
ExoClick	2,714	93 s	34 ms
Revcontent	819	92 s	113 ms
Foursixty	1,129	92 s	82 ms
Bizible	795	92 s	115 ms
Sidecar	334	91 s	272 ms
SessionCam	1,131	87 s	77 ms
Po.st	818	86 s	105 ms
iovation	1,009	85 s	85 ms
Survicate	515	85 s	166 ms
Symantec	1,246	85 s	69 ms
Refersion	830	85 s	102 ms
Dailymotion	256	84 s	327 ms
Time	245	83 s	339 ms
plista	681	83 s	121 ms
StreamRail	127	82 s	644 ms
Global-e	269	80 s	296 ms
Marketplace Web Service	305	79 s	260 ms
Forensiq	419	78 s	185 ms
Sparkflow	317	77 s	243 ms
Pardot	221	75 s	341 ms
WebEngage	603	74 s	123 ms
Cross Pixel Media	479	73 s	153 ms
Snacktools	296	73 s	248 ms
Smart Insight Tracking	794	71 s	89 ms
Lytics	556	70 s	126 ms
Adkontekst	384	70 s	182 ms
Cachefly	139	70 s	502 ms
Tail Target	852	69 s	81 ms
Usabilla	850	69 s	81 ms
Alexa	1,209	68 s	56 ms
Proper Media	121	67 s	557 ms
Affiliate Window	911	67 s	74 ms
Cloudinary	315	67 s	213 ms
The Hut Group	624	67 s	107 ms
Google Plus	567	66 s	117 ms
ReTargeter	223	66 s	296 ms
FoxyCart	281	65 s	233 ms
Yieldify	180	65 s	360 ms
Madison Logic	513	64 s	124 ms
SnapEngage	931	63 s	68 ms
Rackspace	166	63 s	377 ms
Adscale	799	62 s	78 ms
issuu	686	62 s	91 ms
JustPremium Ads	459	62 s	135 ms
Bing Ads	410	62 s	151 ms
rewardStyle.com	590	62 s	105 ms
GetResponse	699	62 s	88 ms
SoundCloud	226	61 s	270 ms
TRUSTe	669	61 s	91 ms
TrackJS	187	61 s	324 ms
ClickDesk	589	61 s	103 ms
Reevoo	374	60 s	161 ms
Tribal Fusion	1,082	58 s	54 ms
Effective Measure	620	58 s	93 ms
Underdog Media	146	56 s	382 ms
WalkMe	345	56 s	161 ms
Vimeo	183	55 s	301 ms
Better Business Bureau	177	55 s	311 ms
Gleam	431	55 s	127 ms
Bootstrap Chinese network	276	53 s	192 ms
Kampyle	471	53 s	113 ms
Tencent	522	53 s	101 ms
Nativo	562	53 s	94 ms
Tradelab	699	53 s	75 ms
Evergage	235	53 s	224 ms
Trusted Shops	1,322	52 s	40 ms
Keywee	269	52 s	192 ms
Clicktripz	200	50 s	251 ms
Profitshare	386	50 s	129 ms
Branch Metrics	730	50 s	68 ms
Yottaa	165	49 s	297 ms
Kaizen Platform	252	49 s	193 ms
The ADEX	636	48 s	76 ms
Elastic Ad	506	48 s	95 ms
Bootstrap CDN	712	48 s	67 ms
Navegg	559	47 s	84 ms
Crazy Egg	348	46 s	133 ms
TruConversion	228	45 s	198 ms
CNET Content Solutions	74	45 s	602 ms
SpringServer	103	44 s	425 ms
ShopRunner	149	44 s	293 ms
WebSpectator	218	43 s	198 ms
bRealTime	105	43 s	408 ms
Zanox	370	43 s	115 ms
unpkg	243	42 s	174 ms
Reflektion	135	42 s	313 ms
LinkedIn Ads	541	42 s	78 ms
CDN.net	113	42 s	368 ms
BoldChat	443	41 s	93 ms
Socialphotos	242	40 s	165 ms
Onet	109	40 s	364 ms
Pingdom RUM	202	40 s	196 ms
Nend	945	40 s	42 ms
TripleLift	349	39 s	111 ms
DMD Marketing	235	39 s	165 ms
Adloox	122	38 s	314 ms
reEmbed	159	38 s	240 ms
Fresh Relevance	384	38 s	98 ms
Github	426	38 s	88 ms
News	182	37 s	203 ms
Concert	297	37 s	123 ms
The Trade Desk	234	36 s	156 ms
Permutive	202	36 s	177 ms
LightWidget	444	36 s	80 ms
Weborama	441	35 s	80 ms
Snack Media	118	35 s	295 ms
Typepad	181	34 s	190 ms
Captify Media	292	34 s	116 ms
Neodata	429	34 s	79 ms
Conversant Tag Manager	191	33 s	175 ms
Petametrics	223	33 s	149 ms
LiveHelpNow	348	33 s	94 ms
Postcode Anywhere (Holdings)	142	33 s	230 ms
fifty-five	225	33 s	145 ms
Highcharts	281	32 s	115 ms
Conversant	129	32 s	249 ms
Steelhouse	296	32 s	108 ms
Intercept Interactive	284	32 s	113 ms
Riskified	438	32 s	72 ms
Playbuzz	209	32 s	151 ms
ReadSpeaker	400	31 s	79 ms
Sooqr Search	408	31 s	76 ms
MLveda	78	31 s	399 ms
DemandBase	376	31 s	82 ms
Ghostery Enterprise	234	30 s	129 ms
AdSniper	123	30 s	242 ms
Key CDN	170	30 s	175 ms
Appier	347	29 s	85 ms
SaleCycle	336	29 s	87 ms
Adition	324	29 s	88 ms
Exponea	298	28 s	95 ms
Unruly Media	273	28 s	102 ms
Sajari Pty	202	27 s	135 ms
SublimeSkinz	407	27 s	65 ms
Ambassador	204	26 s	130 ms
Advance Magazine Group	160	26 s	165 ms
Zarget	216	25 s	118 ms
Ipify	227	25 s	110 ms
Feedbackify	300	25 s	83 ms
NetAffiliation	212	24 s	116 ms
linkpulse	332	24 s	74 ms
Webtrekk	189	24 s	127 ms
eXelate	263	24 s	91 ms
CPEx	299	24 s	80 ms
SnapWidget	624	23 s	37 ms
DialogTech	266	23 s	87 ms
ResponseTap	299	23 s	76 ms
Sourcepoint	104	23 s	217 ms
Republer	187	22 s	117 ms
TechTarget	131	22 s	166 ms
FLXone	164	22 s	132 ms
VoiceFive	188	22 s	115 ms
Byside	162	21 s	131 ms
ResponsiveVoice	258	20 s	78 ms
Browsealoud	368	20 s	54 ms
Transifex	104	20 s	191 ms
Vee24	103	20 s	190 ms
Edge Web Fonts	243	19 s	78 ms
Accordant Media	196	18 s	92 ms
Hupso Website Analyzer	251	18 s	70 ms
Aggregate Knowledge	246	18 s	72 ms
BannerFlow	222	18 s	80 ms
Viacom	124	17 s	138 ms
Sirv	177	17 s	96 ms
Hull.js	117	17 s	142 ms
LoyaltyLion	61	16 s	270 ms
Customer.io	150	16 s	108 ms
Talkable	198	16 s	81 ms
Fonecall	67	16 s	236 ms
Vibrant Media	153	15 s	101 ms
Resonance Insights	101	15 s	152 ms
MaxMind	119	15 s	128 ms
GoSquared	193	15 s	76 ms
Civic	188	14 s	77 ms
Marketo	114	14 s	126 ms
Exactag	129	14 s	111 ms
Sweet Tooth	131	14 s	108 ms
CleverTap	168	14 s	83 ms
KISSmetrics	94	14 s	144 ms
Betgenius	133	13 s	101 ms
Omniconvert	159	13 s	83 ms
SlimCut Media Outstream	130	13 s	102 ms
AnswerDash	90	13 s	145 ms
Extole	92	13 s	139 ms
Apester	153	12 s	81 ms
Simpli.fi	147	12 s	85 ms
Infinity Tracking	151	12 s	82 ms
OnScroll	145	12 s	85 ms
Adobe Marketing Cloud	141	12 s	87 ms
Auto Link Maker	134	12 s	91 ms
AdRiver	113	12 s	106 ms
DialogTech SourceTrak	177	12 s	67 ms
CyberSource (Visa)	156	12 s	74 ms
Woopra	172	12 s	67 ms
Opinion Stage	127	11 s	88 ms
Video Media Groep	110	11 s	102 ms
Adthink	92	11 s	121 ms
Ziff Davis Tech	126	11 s	87 ms
Triblio	68	11 s	157 ms
Exponential Interactive	201	11 s	53 ms
Friendbuy	131	11 s	80 ms
Twitter Online Conversion Tracking	169	10 s	62 ms
Impact Radius	138	10 s	75 ms
Flickr	120	10 s	85 ms
Covert Pics	139	10 s	73 ms
Swoop	133	10 s	76 ms
Pagefair	144	10 s	70 ms
AWeber	147	10 s	67 ms
Drip	204	10 s	48 ms
SecuredVisit	136	10 s	72 ms
Polldaddy	97	10 s	99 ms
Widespace	118	9 s	80 ms
FreakOut	147	9 s	64 ms
LongTail Ad Solutions	124	9 s	74 ms
Tag Inspector	100	9 s	90 ms
Cookie-Script.com	87	9 s	98 ms
Net Reviews	101	8 s	79 ms
Freespee	96	8 s	83 ms
Research Online	115	8 s	68 ms
Delta Projects AB	128	8 s	59 ms
Sailthru	127	7 s	58 ms
Klevu Search	116	7 s	60 ms
Amplitude Mobile Analytics	83	6 s	72 ms
UpSellit	56	6 s	104 ms
Fastly Insights	86	5 s	60 ms
Browser-Update.org	73	5 s	70 ms
StatCounter	59	4 s	73 ms
Soundest	55	4 s	76 ms
Curalate	58	4 s	71 ms
piano	57	2 s	36 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": [
        "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 query used to compute the origin-level data is in sql/origin-execution-time-query.sql, running this against the latest Lighthouse HTTP Archive should give you a JSON export of the latest data that can be checked in at data/YYYY-MM-DD-origin-scripting.json.

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

Updating the website

The web code is located in www/ directory of this repository. Open a PR to make changes.