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.

Data

Summary

Across top ~1 million sites, ~800 origins account for ~65% of all script execution time with the top 100 entities already accounting for ~59%. 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. Other balloons as a category primarily due to Google Tag Manager which is used to deliver scripts in multiple categories. Google Tag Manager script execution alone is responsible for more than half of the "Mixed / Other" category.

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	Gemius	6,998	69 ms
4	BlueKai	2,548	71 ms
5	Crowd Control	2,553	74 ms
6	MailMunch	4,315	77 ms
7	fluct	6,732	79 ms
8	Geniee	2,226	81 ms
9	Rakuten Marketing	1,540	83 ms
10	PubNation	2,499	88 ms
11	Scorecard Research	9,088	94 ms
12	Unbounce	2,338	95 ms
13	Outbrain	5,244	98 ms
14	Constant Contact	1,251	101 ms
15	PushCrew	3,335	101 ms
16	SmartAdServer	1,776	102 ms
17	Rubicon Project	3,011	107 ms
18	Amazon Ads	24,660	108 ms
19	OwnerIQ	1,541	110 ms
20	Adroll	3,119	111 ms
21	Digital ad Consortium	3,777	117 ms
22	AudienceSearch	4,389	117 ms
23	Smart AdServer	3,223	121 ms
24	TrafficStars	1,093	122 ms
25	DTSCOUT	7,417	130 ms
26	Adocean	1,319	136 ms
27	Adverline Board	1,307	137 ms
28	Yahoo!	3,830	138 ms
29	Criteo	66,114	139 ms
30	Skimbit	15,074	146 ms
31	Microad	1,328	149 ms
32	Chitika	1,010	150 ms
33	Cxense	3,773	153 ms
34	JustUno	1,944	154 ms
35	Tynt	25,583	154 ms
36	Adform	9,062	155 ms
37	Rocket Fuel	5,755	161 ms
38	MGID	10,481	161 ms
39	JuicyAds	2,935	163 ms
40	Bing Ads	13,332	167 ms
41	Sharethrough	2,195	170 ms
42	sovrn	5,371	172 ms
43	Pubmatic	6,439	173 ms
44	Klaviyo	7,677	181 ms
45	Teads	6,589	187 ms
46	Market GID	3,124	190 ms
47	Index Exchange	3,336	196 ms
48	Taboola	25,671	200 ms
49	LongTail Ad Solutions	2,789	203 ms
50	Google/Doubleclick Ads	1,165,800	221 ms
51	Sortable	1,028	252 ms
52	WordAds	33,392	252 ms
53	Yandex Ads	38,205	266 ms
54	iBillboard	3,258	272 ms
55	Admixer for Publishers	2,597	280 ms
56	AppNexus	14,926	308 ms
57	Sizmek	3,935	321 ms
58	VigLink	5,806	325 ms
59	Privy	9,952	329 ms
60	Media.net	11,818	334 ms
61	Integral Ad Science	25,277	368 ms
62	MediaVine	9,768	520 ms
63	Infolinks	4,090	524 ms
64	DoubleVerify	4,033	537 ms
65	GumGum	4,172	589 ms
66	Between Digital	1,107	600 ms
67	Popads	4,548	681 ms
68	Vidible	1,566	746 ms
69	Moat	18,342	756 ms
70	AdMatic	2,707	759 ms
71	33 Across	15,704	876 ms
72	LKQD	2,090	885 ms
73	OpenX	8,892	954 ms
74	fam	3,505	1086 ms
75	Yieldmo	2,227	1235 ms
76	StickyADS.tv	2,010	1292 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	1,261	52 ms
2	Net Reviews	1,893	59 ms
3	StatCounter	4,693	60 ms
4	Amplitude Mobile Analytics	1,250	68 ms
5	etracker	1,732	71 ms
6	Roxr Software	1,822	73 ms
7	Heap	1,859	75 ms
8	Trust Pilot	2,741	77 ms
9	Google Analytics	1,082,088	78 ms
10	Mixpanel	4,908	79 ms
11	Searchanise	2,459	88 ms
12	Baidu Analytics	8,169	91 ms
13	Hotjar	95,852	95 ms
14	Chartbeat	6,959	96 ms
15	VWO	6,352	102 ms
16	Quantcast	6,607	107 ms
17	CallRail	3,843	109 ms
18	Snowplow	3,615	110 ms
19	Parse.ly	2,616	113 ms
20	Marchex	3,844	113 ms
21	Nosto	2,973	114 ms
22	Crazy Egg	9,881	114 ms
23	Clicktale	2,351	118 ms
24	ForeSee	2,612	124 ms
25	Treasure Data	9,714	131 ms
26	Nielsen NetRatings SiteCensus	15,441	141 ms
27	Evidon	1,208	142 ms
28	Gigya	1,949	176 ms
29	Bazaarvoice	3,285	184 ms
30	Maxymiser	1,139	189 ms
31	Bounce Exchange	1,374	190 ms
32	Segment	6,940	198 ms
33	FullStory	4,996	223 ms
34	Ezoic	3,016	241 ms
35	Optimizely	13,098	249 ms
36	Feefo.com	2,218	251 ms
37	Salesforce	36,481	300 ms
38	Radar	4,912	303 ms
39	Yandex Metrica	218,992	316 ms
40	Inspectlet	4,984	320 ms
41	Keen	2,382	373 ms
42	SessionCam	1,456	380 ms
43	Histats	13,937	408 ms
44	AB Tasty	3,111	455 ms
45	mPulse	2,841	543 ms
46	Mouseflow	1,391	569 ms
47	Lucky Orange	5,987	872 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	VK	6,380	69 ms
2	Kakao	8,746	83 ms
3	Instagram	5,167	85 ms
4	Micropat	22,116	89 ms
5	Pinterest	15,097	102 ms
6	AddShoppers	1,147	109 ms
7	Facebook	1,103,174	120 ms
8	LinkedIn	12,119	122 ms
9	Yandex Share	30,092	133 ms
10	Twitter	260,919	147 ms
11	ShareThis	31,606	246 ms
12	Shareaholic	15,606	253 ms
13	AddThis	177,056	278 ms
14	Disqus	1,376	298 ms
15	Tumblr	38,452	324 ms
16	SocialShopWave	1,023	448 ms
17	PIXNET	48,564	544 ms
18	LiveJournal	6,610	734 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	YouTube	25,349	150 ms
2	Wistia	20,701	272 ms
3	Brightcove	4,737	587 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	4,828	71 ms
4	New Relic	3,183	73 ms
5	OneSignal	18,715	74 ms
6	iubenda	9,614	83 ms
7	GetSiteControl	3,144	84 ms
8	iovation	1,009	85 ms
9	Siteimprove	1,637	86 ms
10	Google Maps	247,910	119 ms
11	Other Google APIs/SDKs	477,821	121 ms
12	AppDynamics	1,841	123 ms
13	Bold Commerce	11,530	127 ms
14	Po.st	1,660	134 ms
15	Sift Science	1,117	145 ms
16	MaxCDN Enterprise	2,325	170 ms
17	Seznam	1,424	173 ms
18	Swiftype	1,300	177 ms
19	Fastly	3,396	225 ms
20	Affirm	1,067	245 ms
21	Rambler	8,226	249 ms
22	Cloudflare	5,861	254 ms
23	PayPal	6,948	325 ms
24	Secomapp	1,062	341 ms
25	Yandex APIs	53,493	393 ms
26	Datacamp	10,609	425 ms
27	Distil Networks	10,392	445 ms
28	Sentry	14,388	515 ms
29	Okas Concepts	1,109	573 ms
30	Mapbox	2,558	1215 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	14,174	48 ms
2	Dealer	28,185	130 ms
3	WordPress	127,601	138 ms
4	Shopify	208,073	176 ms
5	Weebly	35,308	322 ms
6	CDK Dealer Management	12,299	330 ms
7	Hatena Blog	62,215	345 ms
8	Squarespace	88,270	398 ms
9	Wix	164,599	972 ms

Marketing

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

Rank	Name	Usage	Average Impact
1	RD Station	2,819	72 ms
2	Listrak	1,078	127 ms
3	Beeketing	59,838	137 ms
4	Mailchimp	24,237	139 ms
5	Drift	4,126	148 ms
6	Ve	3,415	157 ms
7	Hubspot	22,456	169 ms
8	Yotpo	9,652	206 ms
9	OptinMonster	1,125	248 ms
10	Sumo	55,139	263 ms
11	Bigcommerce	11,802	301 ms
12	Albacross	1,332	732 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	1,084	79 ms
2	iPerceptions	2,648	88 ms
3	LiveChat	16,750	96 ms
4	iAdvize SAS	2,584	100 ms
5	LivePerson	4,547	114 ms
6	Comm100	1,539	119 ms
7	Pure Chat	4,086	162 ms
8	Tidio Live Chat	5,979	309 ms
9	Jivochat	23,555	322 ms
10	Olark	12,238	331 ms
11	Intercom	16,322	334 ms
12	Dynamic Yield	1,773	340 ms
13	Tawk.to	39,669	344 ms
14	LiveTex	2,673	371 ms
15	ZenDesk	84,795	508 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	AMP	58,086	217 ms
5	Embedly	2,686	227 ms
6	Vox Media	1,129	273 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	6,903	95 ms
2	FontAwesome CDN	16,717	126 ms
3	Yandex CDN	1,885	138 ms
4	Microsoft Hosted Libs	4,639	164 ms
5	jQuery CDN	137,421	194 ms
6	Monotype	4,142	194 ms
7	Google CDN	728,840	201 ms
8	Cloudflare CDN	94,162	202 ms
9	Unpkg	2,508	231 ms
10	JSDelivr CDN	21,987	269 ms
11	CreateJS CDN	1,649	3048 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	BrightTag / Signal	7,380	134 ms
3	Adobe Tag Manager	32,414	220 ms
4	Ensighten	7,689	252 ms
5	Tealium	15,237	267 ms
6	Google Tag Manager	1,043,021	471 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	47,840	164 ms
2	Pagely	1,047	234 ms
3	All Other 3rd Parties	922,130	243 ms
4	Parking Crew	5,208	474 ms
5	uLogin	2,353	1170 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	1,043,021	491,642 s	471 ms
Google/Doubleclick Ads	1,165,800	257,973 s	221 ms
All Other 3rd Parties	922,130	223,876 s	243 ms
Wix	164,599	159,967 s	972 ms
Google CDN	728,840	146,739 s	201 ms
Facebook	1,103,174	132,167 s	120 ms
Google Analytics	1,082,088	84,606 s	78 ms
Yandex Metrica	218,992	69,273 s	316 ms
Other Google APIs/SDKs	477,821	57,719 s	121 ms
AddThis	177,056	49,149 s	278 ms
ZenDesk	84,795	43,066 s	508 ms
Twitter	260,919	38,408 s	147 ms
Shopify	208,073	36,713 s	176 ms
Squarespace	88,270	35,142 s	398 ms
Google Maps	247,910	29,396 s	119 ms
jQuery CDN	137,421	26,651 s	194 ms
PIXNET	48,564	26,441 s	544 ms
Hatena Blog	62,215	21,442 s	345 ms
Yandex APIs	53,493	21,000 s	393 ms
Cloudflare CDN	94,162	19,048 s	202 ms
WordPress	127,601	17,664 s	138 ms
Sumo	55,139	14,519 s	263 ms
Moat	18,342	13,860 s	756 ms
33 Across	15,704	13,753 s	876 ms
Tawk.to	39,669	13,636 s	344 ms
AMP	58,086	12,591 s	217 ms
Tumblr	38,452	12,464 s	324 ms
Weebly	35,308	11,363 s	322 ms
Salesforce	36,481	10,938 s	300 ms
Yandex Ads	38,205	10,172 s	266 ms
Integral Ad Science	25,277	9,302 s	368 ms
Criteo	66,114	9,205 s	139 ms
Hotjar	95,852	9,073 s	95 ms
OpenX	8,892	8,483 s	954 ms
WordAds	33,392	8,418 s	252 ms
Beeketing	59,838	8,218 s	137 ms
Amazon Web Services	47,840	7,842 s	164 ms
ShareThis	31,606	7,763 s	246 ms
Jivochat	23,555	7,593 s	322 ms
Sentry	14,388	7,413 s	515 ms
Adobe Tag Manager	32,414	7,117 s	220 ms
JSDelivr CDN	21,987	5,918 s	269 ms
Histats	13,937	5,691 s	408 ms
Wistia	20,701	5,640 s	272 ms
Intercom	16,322	5,453 s	334 ms
Lucky Orange	5,987	5,218 s	872 ms
Taboola	25,671	5,137 s	200 ms
MediaVine	9,768	5,081 s	520 ms
CreateJS CDN	1,649	5,026 s	3048 ms
LiveJournal	6,610	4,850 s	734 ms
Distil Networks	10,392	4,622 s	445 ms
AppNexus	14,926	4,592 s	308 ms
Datacamp	10,609	4,505 s	425 ms
Tealium	15,237	4,062 s	267 ms
CDK Dealer Management	12,299	4,062 s	330 ms
Olark	12,238	4,047 s	331 ms
Yandex Share	30,092	4,008 s	133 ms
Tynt	25,583	3,952 s	154 ms
Media.net	11,818	3,945 s	334 ms
Shareaholic	15,606	3,941 s	253 ms
fam	3,505	3,807 s	1086 ms
Hubspot	22,456	3,805 s	169 ms
YouTube	25,349	3,801 s	150 ms
Dealer	28,185	3,668 s	130 ms
Bigcommerce	11,802	3,550 s	301 ms
Mailchimp	24,237	3,364 s	139 ms
Privy	9,952	3,274 s	329 ms
Optimizely	13,098	3,257 s	249 ms
Mapbox	2,558	3,107 s	1215 ms
Popads	4,548	3,098 s	681 ms
Brightcove	4,737	2,778 s	587 ms
uLogin	2,353	2,754 s	1170 ms
Yieldmo	2,227	2,750 s	1235 ms
Amazon Ads	24,660	2,664 s	108 ms
StickyADS.tv	2,010	2,598 s	1292 ms
Parking Crew	5,208	2,469 s	474 ms
GumGum	4,172	2,455 s	589 ms
PayPal	6,948	2,255 s	325 ms
Bing Ads	13,332	2,224 s	167 ms
Skimbit	15,074	2,207 s	146 ms
Nielsen NetRatings SiteCensus	15,441	2,174 s	141 ms
DoubleVerify	4,033	2,167 s	537 ms
Infolinks	4,090	2,144 s	524 ms
FontAwesome CDN	16,717	2,112 s	126 ms
AdMatic	2,707	2,055 s	759 ms
Rambler	8,226	2,050 s	249 ms
Yotpo	9,652	1,991 s	206 ms
Micropat	22,116	1,965 s	89 ms
Blindado	802	1,954 s	2437 ms
Ensighten	7,689	1,934 s	252 ms
VigLink	5,806	1,886 s	325 ms
LKQD	2,090	1,850 s	885 ms
Tidio Live Chat	5,979	1,849 s	309 ms
MGID	10,481	1,690 s	161 ms
LiveChat	16,750	1,615 s	96 ms
Inspectlet	4,984	1,594 s	320 ms
Pinterest	15,097	1,546 s	102 ms
mPulse	2,841	1,544 s	543 ms
Cloudflare	5,861	1,490 s	254 ms
Radar	4,912	1,489 s	303 ms
LinkedIn	12,119	1,475 s	122 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
OneSignal	18,715	1,389 s	74 ms
Segment	6,940	1,371 s	198 ms
Treasure Data	9,714	1,277 s	131 ms
Sizmek	3,935	1,263 s	321 ms
Teads	6,589	1,235 s	187 ms
Vidible	1,566	1,169 s	746 ms
Crazy Egg	9,881	1,127 s	114 ms
Pubmatic	6,439	1,112 s	173 ms
FullStory	4,996	1,112 s	223 ms
LiveTex	2,673	993 s	371 ms
BrightTag / Signal	7,380	989 s	134 ms
Albacross	1,332	975 s	732 ms
DTSCOUT	7,417	967 s	130 ms
Rocket Fuel	5,755	926 s	161 ms
sovrn	5,371	922 s	172 ms
Keen	2,382	888 s	373 ms
iBillboard	3,258	885 s	272 ms
Scorecard Research	9,088	857 s	94 ms
Monotype	4,142	805 s	194 ms
iubenda	9,614	799 s	83 ms
Mouseflow	1,391	791 s	569 ms
Esri ArcGIS	731	782 s	1070 ms
Fastly	3,396	764 s	225 ms
Microsoft Hosted Libs	4,639	761 s	164 ms
Baidu Analytics	8,169	744 s	91 ms
Ezoic	3,016	727 s	241 ms
Admixer for Publishers	2,597	726 s	280 ms
Kakao	8,746	724 s	83 ms
Quantcast	6,607	705 s	107 ms
Hotmart	855	693 s	811 ms
Blogger	14,174	683 s	48 ms
Chartbeat	6,959	671 s	96 ms
Between Digital	1,107	664 s	600 ms
Pure Chat	4,086	662 s	162 ms
Adobe TypeKit	6,903	657 s	95 ms
Index Exchange	3,336	654 s	196 ms
VWO	6,352	648 s	102 ms
Okas Concepts	1,109	635 s	573 ms
Drift	4,126	611 s	148 ms
Embedly	2,686	611 s	227 ms
Dynamic Yield	1,773	603 s	340 ms
Bazaarvoice	3,285	603 s	184 ms
Market GID	3,124	593 s	190 ms
Unpkg	2,508	579 s	231 ms
Cxense	3,773	579 s	153 ms
LongTail Ad Solutions	2,789	567 s	203 ms
Feefo.com	2,218	556 s	251 ms
SessionCam	1,456	553 s	380 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
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
VK	6,380	439 s	69 ms
Marchex	3,844	435 s	113 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
CallRail	3,843	419 s	109 ms
IBM Digital Analytics	858	414 s	482 ms
Disqus	1,376	410 s	298 ms
Snowplow	3,615	399 s	110 ms
MaxCDN Enterprise	2,325	395 s	170 ms
WebpageFX	329	394 s	1199 ms
Smart AdServer	3,223	390 s	121 ms
Mixpanel	4,908	389 s	79 ms
Sharethrough	2,195	373 s	170 ms
Secomapp	1,062	362 s	341 ms
Sekindo	219	359 s	1640 ms
TrackJS	816	355 s	436 ms
Adroll	3,119	345 s	111 ms
Bugsnag	769	344 s	448 ms
Gigya	1,949	342 s	176 ms
Stripe	4,828	342 s	71 ms
Nosto	2,973	339 s	114 ms
PushCrew	3,335	338 s	101 ms
MailMunch	4,315	331 s	77 ms
ForeSee	2,612	325 s	124 ms
Rubicon Project	3,011	321 s	107 ms
Vox Media	1,129	308 s	273 ms
JustUno	1,944	299 s	154 ms
Parse.ly	2,616	296 s	113 ms
Kaltura Video Platform	440	294 s	668 ms
StatCounter	4,693	283 s	60 ms
Digioh	844	281 s	333 ms
OptinMonster	1,125	279 s	248 ms
Clicktale	2,351	278 s	118 ms
Best Of Media S.A.	254	267 s	1051 ms
GetSiteControl	3,144	263 s	84 ms
Affirm	1,067	262 s	245 ms
Bounce Exchange	1,374	261 s	190 ms
Yandex CDN	1,885	260 s	138 ms
Sortable	1,028	259 s	252 ms
iAdvize SAS	2,584	259 s	100 ms
Hola Networks	151	255 s	1690 ms
Media Math	633	254 s	402 ms
Yieldify	723	250 s	346 ms
Underdog Media	367	247 s	674 ms
Seznam	1,424	247 s	173 ms
Pagely	1,047	245 s	234 ms
piano	698	243 s	348 ms
iPerceptions	2,648	232 s	88 ms
New Relic	3,183	231 s	73 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
AppDynamics	1,841	227 s	123 ms
Po.st	1,660	223 s	134 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
Searchanise	2,459	217 s	88 ms
Ooyala	657	216 s	329 ms
Maxymiser	1,139	216 s	189 ms
GitHub	828	215 s	260 ms
Pixlee	337	212 s	630 ms
Trust Pilot	2,741	211 s	77 ms
ShopiMind	310	209 s	674 ms
PerimeterX Bot Defender	209	208 s	997 ms
Expedia	627	208 s	332 ms
Fraudlogix	974	204 s	209 ms
SearchSpring	529	204 s	385 ms
RD Station	2,819	203 s	72 ms
Trip Advisor	346	198 s	572 ms
Microad	1,328	198 s	149 ms
OpenTable	1,845	197 s	107 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
Opentag	984	172 s	175 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
LoopMe	441	166 s	375 ms
Booking.com	978	165 s	169 ms
Sift Science	1,117	162 s	145 ms
ThreatMetrix	184	158 s	858 ms
Qubit Deliver	343	156 s	455 ms
Chitika	1,010	152 s	150 ms
[24]7	294	149 s	507 ms
Siteimprove	1,637	141 s	86 ms
IPONWEB	929	140 s	151 ms
Heap	1,859	140 s	75 ms
Listrak	1,078	137 s	127 ms
Freshdesk	875	135 s	154 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
Rakuten Marketing	1,540	128 s	83 ms
PERFORM	459	127 s	276 ms
Constant Contact	1,251	126 s	101 ms
AddShoppers	1,147	125 s	109 ms
Monetate	939	124 s	132 ms
etracker	1,732	123 s	71 ms
Zmags	263	123 s	467 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
Help Scout	629	116 s	184 ms
MonetizeMore	109	113 s	1038 ms
Net Reviews	1,893	112 s	59 ms
Fanplayr	144	109 s	754 ms
Technorati	814	108 s	133 ms
Curalate	354	106 s	299 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
Smarter Click	477	102 s	214 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
Marketo	960	93 s	97 ms
Revcontent	819	92 s	113 ms
Bizible	795	92 s	115 ms
Madison Logic	798	89 s	112 ms
iovation	1,009	85 s	85 ms
Amplitude Mobile Analytics	1,250	85 s	68 ms
Foursixty	1,084	85 s	79 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
Sidecar	343	82 s	239 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
Adthink	219	72 s	329 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
Republer	756	68 s	90 ms
Proper Media	121	67 s	557 ms
Permutive	499	67 s	134 ms
Affiliate Window	911	67 s	74 ms
Cloudinary	315	67 s	213 ms
The Hut Group	624	67 s	107 ms
ReTargeter	223	66 s	296 ms
FoxyCart	281	65 s	233 ms
Google Plus	599	65 s	109 ms
Alexa	1,261	65 s	52 ms
PhotoBucket	841	64 s	77 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
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
Reevoo	374	60 s	161 ms
Usabilla	794	58 s	73 ms
Tribal Fusion	1,082	58 s	54 ms
Effective Measure	620	58 s	93 ms
WalkMe	345	56 s	161 ms
Better Business Bureau	177	55 s	311 ms
Gleam	431	55 s	127 ms
Omniconvert	462	54 s	116 ms
Bootstrap Chinese network	276	53 s	192 ms
Kampyle	471	53 s	113 ms
Kaizen Platform	290	53 s	183 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
Bootstrap CDN	928	51 s	55 ms
Profitshare	386	50 s	129 ms
Branch Metrics	730	50 s	68 ms
Yottaa	165	49 s	297 ms
The ADEX	636	48 s	76 ms
Elastic Ad	506	48 s	95 ms
Navegg	559	47 s	84 ms
ClickDesk	510	45 s	89 ms
TruConversion	228	45 s	198 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
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
Nend	945	40 s	42 ms
Clicktripz	118	39 s	331 ms
TripleLift	349	39 s	111 ms
Reflektion	198	39 s	195 ms
Adloox	122	38 s	314 ms
reEmbed	159	38 s	240 ms
Github	426	38 s	88 ms
News	182	37 s	203 ms
LightWidget	444	36 s	80 ms
Weborama	441	35 s	80 ms
unpkg	215	35 s	164 ms
SaleCycle	447	35 s	78 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
Pingdom RUM	184	34 s	182 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
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
The Trade Desk	213	29 s	137 ms
Browsealoud	551	29 s	53 ms
Exponea	298	28 s	95 ms
Unruly Media	273	28 s	102 ms
Fresh Relevance	325	27 s	85 ms
Sajari Pty	202	27 s	135 ms
KISSmetrics	354	27 s	76 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
Feedbackify	300	25 s	83 ms
SnapWidget	599	25 s	41 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
DialogTech	266	23 s	87 ms
ResponseTap	299	23 s	76 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
Transifex	104	20 s	191 ms
Vee24	103	20 s	190 ms
Extole	105	18 s	174 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
Ipify	133	17 s	131 ms
Viacom	124	17 s	138 ms
Sirv	177	17 s	96 ms
Hull.js	117	17 s	142 ms
Customer.io	150	16 s	108 ms
Vibrant Media	153	15 s	101 ms
Polldaddy	150	15 s	103 ms
Resonance Insights	101	15 s	152 ms
MaxMind	119	15 s	128 ms
CleverTap	174	14 s	83 ms
Civic	188	14 s	77 ms
Exactag	129	14 s	111 ms
Sweet Tooth	131	14 s	108 ms
GoSquared	192	14 s	73 ms
Betgenius	133	13 s	101 ms
SlimCut Media Outstream	130	13 s	102 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
Talkable	153	12 s	80 ms
AdRiver	113	12 s	106 ms
CyberSource (Visa)	156	12 s	74 ms
Woopra	172	12 s	67 ms
Opinion Stage	140	11 s	81 ms
Video Media Groep	110	11 s	102 ms
DialogTech SourceTrak	169	11 s	66 ms
Ziff Davis Tech	126	11 s	87 ms
Exponential Interactive	201	11 s	53 ms
AnswerDash	126	11 s	84 ms
Impact Radius	138	10 s	75 ms
Flickr	120	10 s	85 ms
Edge Web Fonts	149	10 s	68 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
Vimeo	110	10 s	89 ms
Drip	204	10 s	48 ms
SecuredVisit	136	10 s	72 ms
Auto Link Maker	111	10 s	87 ms
FreakOut	147	9 s	64 ms
Friendbuy	140	9 s	66 ms
Twitter Online Conversion Tracking	135	9 s	64 ms
Research Online	115	8 s	68 ms
Freespee	102	8 s	75 ms
Delta Projects AB	128	8 s	59 ms
Sailthru	127	7 s	58 ms
Klevu Search	116	7 s	60 ms
Fastly Insights	102	6 s	60 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 at least 100 references to their origin in the dataset.
2. The entity's origins have not yet been identified. See How can I contribute?

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 occurences of those scripts.

Average Impact = Total Execution Time / Total Occurences

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.json 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.json. 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