third-party-web

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	2,486	40 ms
2	BlueKai	2,526	74 ms
3	Gemius	7,900	75 ms
4	Affiliate Window	1,043	77 ms
5	MailMunch	4,637	78 ms
6	Crowd Control	2,118	81 ms
7	Rakuten Marketing	1,817	85 ms
8	Tribal Fusion	1,022	88 ms
9	PubNation	2,511	100 ms
10	Scorecard Research	13,146	100 ms
11	PushCrew	3,460	104 ms
12	Constant Contact	1,324	108 ms
13	Outbrain	6,123	108 ms
14	OptiMonk	1,030	116 ms
15	Unbounce	2,102	117 ms
16	Adroll	3,188	119 ms
17	Popads	4,628	122 ms
18	TrafficStars	1,010	122 ms
19	Rubicon Project	4,624	127 ms
20	Amazon Ads	21,711	129 ms
21	DTSCOUT	8,256	131 ms
22	Adyoulike	1,119	132 ms
23	Skimbit	9,803	136 ms
24	fluct	6,482	137 ms
25	Refersion	1,021	144 ms
26	Digital ad Consortium	3,959	144 ms
27	Criteo	73,060	153 ms
28	SmartAdServer	1,996	155 ms
29	AudienceSearch	6,156	156 ms
30	Cxense	4,274	165 ms
31	AOL / Oath / Verizon Media	1,341	171 ms
32	Sharethrough	2,350	177 ms
33	Tynt	18,437	182 ms
34	Microad	2,015	183 ms
35	Adform	8,099	187 ms
36	JuicyAds	2,448	192 ms
37	Pubmatic	4,639	193 ms
38	Bing Ads	13,461	197 ms
39	Index Exchange	3,383	197 ms
40	Smart AdServer	2,965	219 ms
41	Adloox	1,996	226 ms
42	Yahoo!	2,421	227 ms
43	Klaviyo	6,646	257 ms
44	MGID	7,964	266 ms
45	Sortable	1,094	269 ms
46	LongTail Ad Solutions	2,749	271 ms
47	VigLink	7,925	283 ms
48	AppNexus	8,478	289 ms
49	Privy	11,207	305 ms
50	iBillboard	3,265	322 ms
51	Market GID	1,421	369 ms
52	Teads	5,502	384 ms
53	Sizmek	3,971	428 ms
54	Taboola	13,612	465 ms
55	Yandex Ads	23,195	501 ms
56	sovrn	3,202	503 ms
57	Infolinks	4,759	594 ms
58	GumGum	3,776	641 ms
59	Admixer for Publishers	1,319	686 ms
60	WordAds	5,559	687 ms
61	OpenX	7,275	821 ms
62	DoubleVerify	1,929	933 ms
63	Media.net	3,825	956 ms
64	MediaVine	4,296	961 ms
65	Vidible	1,264	987 ms
66	Integral Ad Science	8,575	1077 ms
67	Moat	11,906	1141 ms
68	Google/Doubleclick Ads	624,172	1285 ms
69	AdMatic	1,410	1329 ms
70	LKQD	1,115	1485 ms
71	StickyADS.tv	3,382	1666 ms
72	33 Across	5,937	1736 ms
73	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	StatCounter	5,047	63 ms
3	Amplitude Mobile Analytics	1,327	72 ms
4	etracker	1,907	78 ms
5	Roxr Software	2,185	78 ms
6	Net Reviews	1,462	79 ms
7	Heap	1,845	80 ms
8	Trust Pilot	3,102	84 ms
9	Mixpanel	5,305	85 ms
10	Google Analytics	1,124,001	86 ms
11	Searchanise	2,752	92 ms
12	Chartbeat	6,874	100 ms
13	Hotjar	111,933	104 ms
14	Baidu Analytics	9,153	107 ms
15	Quantcast	6,539	112 ms
16	Marchex	4,382	119 ms
17	CallRail	5,021	120 ms
18	Parse.ly	3,070	126 ms
19	Snowplow	5,357	126 ms
20	Crazy Egg	11,926	130 ms
21	Marketo	1,427	140 ms
22	Monetate	1,009	158 ms
23	Treasure Data	12,262	162 ms
24	Nielsen NetRatings SiteCensus	11,322	166 ms
25	Evidon	1,311	170 ms
26	Snapchat	6,233	186 ms
27	Gigya	1,994	192 ms
28	BounceX	1,459	194 ms
29	Nosto	1,901	197 ms
30	DigiTrust	4,583	197 ms
31	Segment	8,047	198 ms
32	VWO	3,280	211 ms
33	FullStory	5,563	227 ms
34	ForeSee	1,441	255 ms
35	Optimizely	12,417	267 ms
36	Bazaarvoice	2,546	271 ms
37	Ezoic	2,968	271 ms
38	mPulse	5,332	348 ms
39	Inspectlet	5,646	362 ms
40	Yandex Metrica	242,224	376 ms
41	Radar	4,886	383 ms
42	Keen	3,241	384 ms
43	SessionCam	1,564	385 ms
44	Histats	13,523	463 ms
45	Feefo.com	1,430	472 ms
46	AB Tasty	3,435	559 ms
47	Salesforce	20,689	577 ms
48	Mouseflow	1,545	595 ms
49	Lucky Orange	6,691	903 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	VK	7,315	86 ms
2	Instagram	6,195	92 ms
3	Micropat	21,584	105 ms
4	Pinterest	16,532	112 ms
5	Kakao	8,325	117 ms
6	LinkedIn	14,000	122 ms
7	Facebook	1,025,971	144 ms
8	Twitter	259,833	172 ms
9	Yandex Share	22,930	173 ms
10	ShareThis	28,888	313 ms
11	Shareaholic	11,846	412 ms
12	AddThis	134,999	458 ms
13	SocialShopWave	1,250	472 ms
14	PIXNET	26,582	925 ms
15	Tumblr	9,015	1445 ms
16	LiveJournal	3,811	1464 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	1,328	45 ms
2	Stripe	5,020	81 ms
3	New Relic	3,340	81 ms
4	OneSignal	12,191	84 ms
5	Siteimprove	1,855	89 ms
6	Cookiebot	9,516	93 ms
7	GetSiteControl	2,901	94 ms
8	iubenda	10,528	111 ms
9	Bold Commerce	11,282	145 ms
10	Po.st	1,677	146 ms
11	AppDynamics	1,496	149 ms
12	Sift Science	1,232	149 ms
13	Swiftype	1,519	170 ms
14	Other Google APIs/SDKs	279,510	195 ms
15	Seznam	1,854	246 ms
16	MaxCDN Enterprise	1,785	265 ms
17	Fastly	6,187	269 ms
18	Rambler	9,145	270 ms
19	Cloudflare	8,628	272 ms
20	Affirm	1,188	285 ms
21	Google Maps	120,242	312 ms
22	PayPal	9,816	341 ms
23	Secomapp	1,103	428 ms
24	Datacamp	12,603	434 ms
25	Sentry	15,661	462 ms
26	Distil Networks	10,893	486 ms
27	Yandex APIs	21,677	1231 ms
28	Mapbox	3,686	1384 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	105,874	177 ms
3	Dealer	9,877	515 ms
4	Shopify	71,063	633 ms
5	CDK Dealer Management	4,210	1036 ms
6	Squarespace	36,919	1133 ms
7	Hatena Blog	19,231	1282 ms
8	Weebly	14,462	1305 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	Bronto Software	1,110	132 ms
3	Listrak	1,070	145 ms
4	Hubspot	24,759	156 ms
5	Drift	5,072	163 ms
6	Ve	3,307	168 ms
7	Mailchimp	17,626	223 ms
8	Yotpo	10,307	238 ms
9	OptinMonster	7,556	300 ms
10	Beeketing	20,117	449 ms
11	Bigcommerce	7,846	537 ms
12	Albacross	1,737	753 ms
13	Sumo	20,502	794 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	2,822	92 ms
3	LivePerson	4,405	129 ms
4	Comm100	1,643	141 ms
5	LiveChat	10,498	154 ms
6	Pure Chat	4,029	169 ms
7	iAdvize SAS	1,060	251 ms
8	Tawk.to	46,981	343 ms
9	Jivochat	28,194	360 ms
10	Tidio Live Chat	6,518	368 ms
11	Help Scout	1,626	372 ms
12	Dynamic Yield	1,658	459 ms
13	Intercom	13,452	500 ms
14	LiveTex	2,337	510 ms
15	Olark	7,513	626 ms
16	ZenDesk	68,198	697 ms

Content & Publishing

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

Rank	Name	Usage	Average Impact
1	Accuweather	1,510	75 ms
2	OpenTable	2,179	134 ms
3	Embedly	3,082	212 ms
4	AMP	46,495	349 ms
5	Medium	1,329	376 ms
6	Hotmart	1,113	828 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	10,620	91 ms
2	Yandex CDN	1,939	155 ms
3	FontAwesome CDN	19,326	160 ms
4	Microsoft Hosted Libs	4,876	185 ms
5	Monotype	4,640	200 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	Google Tag Manager	481,506	115 ms
2	BrightTag / Signal	6,968	115 ms
3	Adobe Tag Manager	27,224	334 ms
4	Tealium	12,175	353 ms
5	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	47,656	181 ms
2	All Other 3rd Parties	913,172	332 ms
3	Pagely	1,018	346 ms
4	Parking Crew	5,762	484 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	1,025,971	147,647 s	144 ms
Google Analytics	1,124,001	96,913 s	86 ms
Yandex Metrica	242,224	91,128 s	376 ms
AddThis	134,999	61,857 s	458 ms
Google Tag Manager	481,506	55,435 s	115 ms
Other Google APIs/SDKs	279,510	54,369 s	195 ms
ZenDesk	68,198	47,548 s	697 ms
Shopify	71,063	44,957 s	633 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
Hatena Blog	19,231	24,654 s	1282 ms
PIXNET	26,582	24,586 s	925 ms
Cloudflare CDN	90,131	23,395 s	260 ms
Weebly	14,462	18,877 s	1305 ms
WordPress	105,874	18,740 s	177 ms
Sumo	20,502	16,288 s	794 ms
AMP	46,495	16,225 s	349 ms
Tawk.to	46,981	16,092 s	343 ms
Moat	11,906	13,589 s	1141 ms
Tumblr	9,015	13,030 s	1445 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
Criteo	73,060	11,206 s	153 ms
33 Across	5,937	10,306 s	1736 ms
Jivochat	28,194	10,150 s	360 ms
Integral Ad Science	8,575	9,236 s	1077 ms
Adobe Tag Manager	27,224	9,105 s	334 ms
ShareThis	28,888	9,040 s	313 ms
Beeketing	20,117	9,034 s	449 ms
Amazon Web Services	47,656	8,624 s	181 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	13,612	6,328 s	465 ms
Histats	13,523	6,264 s	463 ms
CreateJS CDN	1,713	6,196 s	3617 ms
Lucky Orange	6,691	6,042 s	903 ms
OpenX	7,275	5,971 s	821 ms
StickyADS.tv	3,382	5,634 s	1666 ms
LiveJournal	3,811	5,578 s	1464 ms
Datacamp	12,603	5,465 s	434 ms
Distil Networks	10,893	5,291 s	486 ms
Mapbox	3,686	5,100 s	1384 ms
Dealer	9,877	5,087 s	515 ms
Shareaholic	11,846	4,876 s	412 ms
YouTube	30,547	4,769 s	156 ms
Olark	7,513	4,702 s	626 ms
CDK Dealer Management	4,210	4,362 s	1036 ms
Tealium	12,175	4,301 s	353 ms
Bigcommerce	7,846	4,217 s	537 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
Mailchimp	17,626	3,924 s	223 ms
Hubspot	24,759	3,870 s	156 ms
WordAds	5,559	3,817 s	687 ms
Brightcove	5,100	3,677 s	721 ms
Media.net	3,825	3,658 s	956 ms
Privy	11,207	3,421 s	305 ms
Tynt	18,437	3,351 s	182 ms
PayPal	9,816	3,343 s	341 ms
Optimizely	12,417	3,314 s	267 ms
FontAwesome CDN	19,326	3,102 s	160 ms
uLogin	2,451	2,969 s	1211 ms
Infolinks	4,759	2,828 s	594 ms
Amazon Ads	21,711	2,793 s	129 ms
Parking Crew	5,762	2,788 s	484 ms
Bing Ads	13,461	2,657 s	197 ms
Rambler	9,145	2,466 s	270 ms
Yotpo	10,307	2,454 s	238 ms
AppNexus	8,478	2,448 s	289 ms
GumGum	3,776	2,421 s	641 ms
Tidio Live Chat	6,518	2,398 s	368 ms
Cloudflare	8,628	2,343 s	272 ms
Ensighten	5,840	2,280 s	390 ms
Micropat	21,584	2,270 s	105 ms
OptinMonster	7,556	2,264 s	300 ms
VigLink	7,925	2,243 s	283 ms
MGID	7,964	2,122 s	266 ms
Teads	5,502	2,113 s	384 ms
Inspectlet	5,646	2,042 s	362 ms
Treasure Data	12,262	1,987 s	162 ms
AB Tasty	3,435	1,920 s	559 ms
Nielsen NetRatings SiteCensus	11,322	1,885 s	166 ms
AdMatic	1,410	1,873 s	1329 ms
Radar	4,886	1,871 s	383 ms
Blindado	760	1,859 s	2446 ms
Pinterest	16,532	1,855 s	112 ms
mPulse	5,332	1,853 s	348 ms
DoubleVerify	1,929	1,800 s	933 ms
LinkedIn	14,000	1,710 s	122 ms
Klaviyo	6,646	1,708 s	257 ms
Sizmek	3,971	1,700 s	428 ms
Fastly	6,187	1,667 s	269 ms
LKQD	1,115	1,655 s	1485 ms
Bold Commerce	11,282	1,635 s	145 ms
LiveChat	10,498	1,613 s	154 ms
sovrn	3,202	1,610 s	503 ms
Segment	8,047	1,593 s	198 ms
Crazy Egg	11,926	1,555 s	130 ms
Adform	8,099	1,512 s	187 ms
Skimbit	9,803	1,335 s	136 ms
Scorecard Research	13,146	1,316 s	100 ms
Albacross	1,737	1,308 s	753 ms
FullStory	5,563	1,264 s	227 ms
Vidible	1,264	1,248 s	987 ms
Keen	3,241	1,245 s	384 ms
LiveTex	2,337	1,192 s	510 ms
iubenda	10,528	1,170 s	111 ms
Snapchat	6,233	1,162 s	186 ms
Esri ArcGIS	978	1,150 s	1176 ms
DTSCOUT	8,256	1,085 s	131 ms
iBillboard	3,265	1,050 s	322 ms
Between Digital	915	1,036 s	1132 ms
OneSignal	12,191	1,025 s	84 ms
Yieldmo	934	984 s	1053 ms
Baidu Analytics	9,153	978 s	107 ms
Kakao	8,325	971 s	117 ms
Adobe TypeKit	10,620	971 s	91 ms
AudienceSearch	6,156	958 s	156 ms
Monotype	4,640	930 s	200 ms
Hotmart	1,113	922 s	828 ms
Mouseflow	1,545	919 s	595 ms
Admixer for Publishers	1,319	905 s	686 ms
DigiTrust	4,583	903 s	197 ms
Microsoft Hosted Libs	4,876	901 s	185 ms
Pubmatic	4,639	894 s	193 ms
Cookiebot	9,516	886 s	93 ms
fluct	6,482	886 s	137 ms
Drift	5,072	827 s	163 ms
Sekindo	457	806 s	1763 ms
Ezoic	2,968	805 s	271 ms
BrightTag / Signal	6,968	804 s	115 ms
Dynamic Yield	1,658	762 s	459 ms
LongTail Ad Solutions	2,749	746 s	271 ms
Unpkg	2,947	740 s	251 ms
Quantcast	6,539	730 s	112 ms
Cxense	4,274	704 s	165 ms
VWO	3,280	690 s	211 ms
Blogger	10,705	690 s	64 ms
Chartbeat	6,874	689 s	100 ms
Bazaarvoice	2,546	689 s	271 ms
Pure Chat	4,029	682 s	169 ms
Snowplow	5,357	676 s	126 ms
Feefo.com	1,430	675 s	472 ms
Okas Concepts	598	672 s	1124 ms
Index Exchange	3,383	668 s	197 ms
Outbrain	6,123	662 s	108 ms
Embedly	3,082	653 s	212 ms
WebpageFX	376	648 s	1724 ms
Smart AdServer	2,965	648 s	219 ms
VK	7,315	629 s	86 ms
Help Scout	1,626	605 s	372 ms
SessionCam	1,564	603 s	385 ms
CallRail	5,021	602 s	120 ms
Gemius	7,900	596 s	75 ms
SocialShopWave	1,250	590 s	472 ms
Rubicon Project	4,624	589 s	127 ms
Instagram	6,195	572 s	92 ms
Digital ad Consortium	3,959	570 s	144 ms
LivePerson	4,405	566 s	129 ms
Popads	4,628	564 s	122 ms
IBM Digital Analytics	925	557 s	602 ms
Ve	3,307	555 s	168 ms
Yahoo!	2,421	549 s	227 ms
Market GID	1,421	524 s	369 ms
Marchex	4,382	521 s	119 ms
Kaltura Video Platform	551	503 s	913 ms
Medium	1,329	500 s	376 ms
Meetrics	774	499 s	645 ms
Secomapp	1,103	473 s	428 ms
MaxCDN Enterprise	1,785	472 s	265 ms
JuicyAds	2,448	471 s	192 ms
Seznam	1,854	456 s	246 ms
Adloox	1,996	451 s	226 ms
Mixpanel	5,305	451 s	85 ms
LeasdBoxer	116	440 s	3792 ms
Sharethrough	2,350	416 s	177 ms
Stripe	5,020	405 s	81 ms
Digioh	768	395 s	515 ms
PerimeterX Bot Defender	297	392 s	1320 ms
Parse.ly	3,070	385 s	126 ms
Gigya	1,994	384 s	192 ms
Adroll	3,188	381 s	119 ms
Nosto	1,901	374 s	197 ms
Microad	2,015	368 s	183 ms
ForeSee	1,441	367 s	255 ms
MailMunch	4,637	363 s	78 ms
PushCrew	3,460	359 s	104 ms
Hola Networks	175	357 s	2038 ms
Ecwid	703	354 s	504 ms
Audience 360	420	353 s	842 ms
Pagely	1,018	353 s	346 ms
Disqus	855	352 s	412 ms
Cedato	100	351 s	3513 ms
TrackJS	860	347 s	404 ms
Affirm	1,188	339 s	285 ms
Bugsnag	843	331 s	393 ms
Clicktale	936	328 s	351 ms
Underdog Media	359	324 s	904 ms
StatCounter	5,047	320 s	63 ms
Pixlee	371	313 s	843 ms
Zmags	182	309 s	1699 ms
SmartAdServer	1,996	309 s	155 ms
Perfect Market	889	303 s	341 ms
Best Of Media S.A.	237	301 s	1271 ms
Yandex CDN	1,939	300 s	155 ms
Vox Media	708	296 s	418 ms
Sortable	1,094	294 s	269 ms
OpenTable	2,179	291 s	134 ms
BounceX	1,459	283 s	194 ms
GetSiteControl	2,901	273 s	94 ms
New Relic	3,340	272 s	81 ms
iAdvize SAS	1,060	267 s	251 ms
Wishpond Technologies	518	265 s	512 ms
piano	856	264 s	309 ms
Adthink	486	264 s	543 ms
RD Station	3,457	262 s	76 ms
Trust Pilot	3,102	262 s	84 ms
iPerceptions	2,822	261 s	92 ms
Swiftype	1,519	258 s	170 ms
UserReport	884	255 s	288 ms
Yieldify	729	255 s	350 ms
Searchanise	2,752	252 s	92 ms
PubNation	2,511	251 s	100 ms
Media Management Technologies	596	249 s	417 ms
Ooyala	337	247 s	734 ms
Unbounce	2,102	246 s	117 ms
Decibel Insight	551	246 s	447 ms
Po.st	1,677	245 s	146 ms
Fort Awesome	740	244 s	330 ms
Fraudlogix	872	239 s	274 ms
Expedia	299	235 s	786 ms
Comm100	1,643	231 s	141 ms
AOL / Oath / Verizon Media	1,341	229 s	171 ms
Maxymiser	831	226 s	272 ms
PhotoBucket	737	226 s	306 ms
AppDynamics	1,496	224 s	149 ms
Evidon	1,311	223 s	170 ms
Trip Advisor	177	221 s	1250 ms
Opta	337	221 s	655 ms
Celtra	568	218 s	383 ms
Technorati	478	215 s	451 ms
ShopiMind	324	212 s	655 ms
Media Math	604	210 s	348 ms
Signyfyd	202	209 s	1033 ms
GitHub	818	208 s	254 ms
Adocean	900	207 s	230 ms
Marketo	1,427	200 s	140 ms
Opentag	976	197 s	202 ms
SearchSpring	299	195 s	653 ms
Booking.com	685	190 s	277 ms
Connatix	201	187 s	932 ms
BlueKai	2,526	186 s	74 ms
Sift Science	1,232	184 s	149 ms
Janrain	153	178 s	1167 ms
Crowd Control	2,118	172 s	81 ms
ThreatMetrix	165	171 s	1039 ms
FirstImpression	302	171 s	566 ms
Roxr Software	2,185	170 s	78 ms
Rackspace	561	168 s	299 ms
Adtech (AOL)	214	168 s	783 ms
Siteimprove	1,855	164 s	89 ms
Adverline Board	565	164 s	291 ms
smartclip	393	163 s	415 ms
LoopMe	487	160 s	329 ms
IPONWEB	899	160 s	178 ms
Qubit Deliver	354	159 s	450 ms
Monetate	1,009	159 s	158 ms
Listrak	1,070	155 s	145 ms
Rakuten Marketing	1,817	155 s	85 ms
[24]7	137	151 s	1100 ms
Chitika	711	150 s	211 ms
etracker	1,907	148 s	78 ms
Heap	1,845	147 s	80 ms
Adyoulike	1,119	147 s	132 ms
Flowplayer	418	147 s	352 ms
Refersion	1,021	147 s	144 ms
Bronto Software	1,110	146 s	132 ms
PERFORM	96	144 s	1505 ms
Constant Contact	1,324	142 s	108 ms
Freshdesk	898	141 s	157 ms
SpotXchange	464	139 s	300 ms
AvantLink	156	139 s	888 ms
TagCommander	962	132 s	138 ms
MonetizeMore	111	129 s	1165 ms
AddShoppers	841	128 s	153 ms
eBay	681	128 s	188 ms
Picreel	569	127 s	223 ms
One by AOL	592	125 s	212 ms
WisePops	501	125 s	250 ms
PowerReviews	612	125 s	205 ms
Clerk.io ApS	738	124 s	169 ms
TrafficStars	1,010	123 s	122 ms
Convert Insights	955	123 s	129 ms
Pardot	381	121 s	318 ms
OptiMonk	1,030	120 s	116 ms
Marketplace Web Service	211	119 s	562 ms
StreamRail	72	117 s	1631 ms
Curalate	392	116 s	297 ms
Smarter Click	430	116 s	269 ms
Skype	669	115 s	172 ms
Net Reviews	1,462	115 s	79 ms
Bizible	858	114 s	133 ms
Accuweather	1,510	113 s	75 ms
Interpublic Group	459	111 s	242 ms
Revcontent	961	111 s	116 ms
Mather Economics	554	110 s	199 ms
Global-e	228	108 s	473 ms
Cloudinary	379	107 s	283 ms
Forensiq	494	105 s	212 ms
plista	903	105 s	116 ms
Sparkflow	353	104 s	294 ms
Pictela (AOL)	209	103 s	495 ms
Adnium	333	102 s	307 ms
Snacktools	337	101 s	301 ms
Survicate	540	101 s	187 ms
LinkedIn Ads	633	100 s	158 ms
ExoClick	2,486	100 s	40 ms
Symantec	863	99 s	114 ms
Dailymotion	232	98 s	424 ms
Amplitude Mobile Analytics	1,327	96 s	72 ms
Mobify	222	96 s	431 ms
Polar Mobile Group	477	95 s	200 ms
ZEDO	302	95 s	316 ms
Playbuzz	343	95 s	278 ms
OwnerIQ	749	95 s	127 ms
Livefyre	258	94 s	365 ms
Kargo	77	94 s	1219 ms
Shopgate	395	93 s	235 ms
Foursixty	1,129	92 s	82 ms
ReTargeter	256	92 s	358 ms
Tail Target	877	91 s	104 ms
issuu	797	91 s	114 ms
WebEngage	744	91 s	122 ms
Sidecar	334	91 s	272 ms
Tribal Fusion	1,022	90 s	88 ms
iovation	949	89 s	94 ms
SpringServer	95	89 s	935 ms
Adkontekst	226	88 s	388 ms
The Trade Desk	308	87 s	281 ms
Touch Commerce	131	86 s	660 ms
Cross Pixel Media	449	85 s	190 ms
The Hut Group	290	83 s	287 ms
Geniee	884	82 s	93 ms
Republer	580	82 s	141 ms
Reevoo	380	81 s	214 ms
Affiliate Window	1,043	81 s	77 ms
Bootstrap Chinese network	280	81 s	289 ms
Permutive	587	81 s	137 ms
Gleam	423	79 s	187 ms
Fanplayr	107	79 s	735 ms
Lytics	593	78 s	132 ms
GetResponse	750	78 s	104 ms
Kameleoon	170	77 s	452 ms
Tradelab	807	75 s	92 ms
FoxyCart	321	74 s	232 ms
JustPremium Ads	499	74 s	148 ms
LoyaltyLion	188	73 s	390 ms
Time	252	73 s	290 ms
SnapEngage	985	72 s	73 ms
Profitshare	326	71 s	218 ms
WalkMe	113	71 s	627 ms
PlayAd Media Group	126	71 s	561 ms
Keywee	271	70 s	257 ms
rewardStyle.com	640	69 s	109 ms
Typepad	277	69 s	249 ms
Usabilla	850	69 s	81 ms
Alexa	1,209	68 s	56 ms
WebSpectator	152	68 s	447 ms
Stackla PTY	331	68 s	205 ms
Nativo	588	68 s	115 ms
Adobe Test & Target	51	67 s	1312 ms
Google Plus	567	66 s	117 ms
Yottaa	163	66 s	404 ms
Smart Insight Tracking	700	65 s	93 ms
RebelMouse	56	65 s	1157 ms
Effective Measure	661	65 s	98 ms
Forter	91	64 s	706 ms
Navegg	687	64 s	93 ms
Madison Logic	513	64 s	124 ms
reEmbed	185	63 s	340 ms
Pixalate	186	61 s	330 ms
Branch Metrics	825	61 s	74 ms
ClickDesk	589	61 s	103 ms
ShopRunner	178	60 s	339 ms
Trusted Shops	1,328	59 s	45 ms
Kampyle	438	59 s	135 ms
AdSniper	207	58 s	280 ms
Elastic Ad	612	58 s	94 ms
Simplicity Marketing	150	58 s	385 ms
Evergage	242	56 s	233 ms
Rocket Fuel	668	55 s	83 ms
bRealTime	245	55 s	225 ms
Vimeo	183	55 s	301 ms
Github	373	54 s	145 ms
TRUSTe	492	54 s	110 ms
Autopilot	582	53 s	91 ms
InSkin Media	73	53 s	720 ms
Tencent	409	52 s	128 ms
TruConversion	256	52 s	201 ms
SoundCloud	222	51 s	231 ms
Clicktripz	200	50 s	251 ms
BoldChat	518	49 s	95 ms
Adscale	534	49 s	91 ms
KISSmetrics	529	49 s	92 ms
Kaizen Platform	252	49 s	193 ms
Zanox	379	49 s	128 ms
The ADEX	564	48 s	85 ms
Bootstrap CDN	712	48 s	67 ms
Highcharts	304	48 s	157 ms
DMD Marketing	295	47 s	160 ms
News	158	45 s	288 ms
Omniconvert	472	45 s	94 ms
CNET Content Solutions	74	45 s	602 ms
Onet	107	44 s	411 ms
Weborama	485	44 s	90 ms
Key CDN	234	43 s	183 ms
unpkg	243	42 s	174 ms
Reflektion	135	42 s	313 ms
LightWidget	525	42 s	80 ms
Steelhouse	366	42 s	115 ms
SkyScanner	114	42 s	369 ms
Conversant	80	42 s	523 ms
BlueCava	79	41 s	517 ms
Conversant Tag Manager	189	40 s	210 ms
Pingdom RUM	202	40 s	196 ms
Socialphotos	223	40 s	178 ms
User Replay	76	39 s	517 ms
ReadSpeaker	432	39 s	91 ms
Proper Media	105	39 s	371 ms
fifty-five	254	39 s	152 ms
Snack Media	96	38 s	399 ms
Nend	892	38 s	43 ms
SaleCycle	441	38 s	86 ms
Fresh Relevance	384	38 s	98 ms
TripleLift	230	38 s	163 ms
Riskified	499	37 s	74 ms
Concert	297	37 s	123 ms
Adition	389	36 s	93 ms
Ghostery Enterprise	223	36 s	161 ms
Petametrics	189	36 s	189 ms
Neodata	318	34 s	107 ms
DemandBase	376	34 s	89 ms
DialogTech	321	33 s	103 ms
CDN.net	90	33 s	368 ms
Intercept Interactive	247	33 s	132 ms
CPEx	219	32 s	146 ms
LiveHelpNow	301	32 s	106 ms
Sooqr Search	417	32 s	76 ms
Exponea	312	31 s	101 ms
MLveda	78	31 s	399 ms
Advance Magazine Group	168	29 s	175 ms
Knight Lab	59	29 s	497 ms
Ambassador	209	29 s	140 ms
eXelate	309	29 s	94 ms
Appier	331	29 s	87 ms
Feedbackify	316	29 s	91 ms
Sajari Pty	213	28 s	133 ms
Browsealoud	468	27 s	59 ms
BannerFlow	255	27 s	108 ms
Viacom	138	27 s	198 ms
SublimeSkinz	378	27 s	71 ms
ResponseTap	337	27 s	80 ms
Postcode Anywhere (Holdings)	138	27 s	194 ms
Vee24	101	27 s	262 ms
ResponsiveVoice	341	26 s	77 ms
Cachefly	55	26 s	475 ms
linkpulse	336	26 s	77 ms
NetAffiliation	220	26 s	118 ms
Wow Analytics	123	25 s	206 ms
VidPulse	79	25 s	320 ms
Ipify	227	25 s	110 ms
VoiceFive	183	24 s	134 ms
Hupso Website Analyzer	328	24 s	74 ms
Accordant Media	250	24 s	95 ms
Aggregate Knowledge	314	24 s	75 ms
FLXone	154	23 s	152 ms
SnapWidget	624	23 s	37 ms
Transifex	121	23 s	192 ms
TechTarget	64	23 s	361 ms
Alliance for Audited Media	95	23 s	243 ms
Unruly Media	179	23 s	128 ms
Sourcepoint	104	23 s	217 ms
Sweet Tooth	217	22 s	100 ms
Dynamic Converter	65	21 s	326 ms
cloudIQ	146	21 s	144 ms
OCSP	110	21 s	191 ms
Zarget	201	21 s	103 ms
Simpli.fi	181	21 s	114 ms
Borderfree	66	21 s	311 ms
Moovweb	71	20 s	287 ms
Pusher	117	20 s	174 ms
Resonance Insights	112	20 s	180 ms
Customer.io	175	20 s	115 ms
Video Media Groep	177	20 s	112 ms
Silverpop	236	19 s	80 ms
Edge Web Fonts	243	19 s	78 ms
Sirv	195	19 s	97 ms
FreakOut	284	19 s	65 ms
Vibrant Media	155	18 s	118 ms
LoginRadius	79	18 s	227 ms
AWeber	182	18 s	98 ms
Infinity Tracking	197	18 s	90 ms
Byside	79	18 s	222 ms
Vertical Mass	81	18 s	217 ms
Webtrends	53	17 s	326 ms
FuelX	96	17 s	179 ms
Council ad Network	142	17 s	120 ms
Rakuten LinkShare	122	17 s	139 ms
Delta Projects AB	225	17 s	75 ms
Civic	213	17 s	80 ms
PebblePost	73	17 s	228 ms
AdvertServe	148	16 s	110 ms
Cookie-Script.com	155	16 s	104 ms
AdSpruce	54	16 s	299 ms
Talkable	198	16 s	81 ms
Revolver Maps	150	16 s	106 ms
Fonecall	67	16 s	236 ms
AdRiver	148	16 s	107 ms
Vergic AB	73	16 s	215 ms
StumbleUpon	103	16 s	152 ms
Impact Radius	183	15 s	83 ms
Exactag	138	15 s	109 ms
CleverDATA	142	15 s	105 ms
MaxMind	118	15 s	126 ms
SlimCut Media Outstream	139	15 s	106 ms
GoSquared	193	15 s	76 ms
Exponential Interactive	242	15 s	61 ms
Hull.js	112	14 s	128 ms
Adobe Marketing Cloud	154	14 s	93 ms
The Publisher Desk	62	14 s	226 ms
Woopra	198	14 s	71 ms
CleverTap	168	14 s	83 ms
Vergic Engage Platform	59	14 s	235 ms
Salesforce.com	193	14 s	72 ms
Optimove	84	14 s	164 ms
Polyfill service	91	14 s	150 ms
AnswerDash	90	13 s	145 ms
Extole	92	13 s	139 ms
Widespace	130	13 s	97 ms
AdTrue	113	12 s	110 ms
Auto Link Maker	134	12 s	91 ms
Apester	145	12 s	83 ms
Betgenius	120	12 s	100 ms
DialogTech SourceTrak	177	12 s	67 ms
Drip	225	12 s	52 ms
Storygize	81	12 s	143 ms
SecuredVisit	141	11 s	81 ms
Vindico	96	11 s	117 ms
Opinion Stage	127	11 s	88 ms
BuySellAds	127	11 s	88 ms
CyberSource (Visa)	155	11 s	69 ms
Triblio	68	11 s	157 ms
C3 Metrics	65	11 s	163 ms
Research Online	131	11 s	81 ms
epoq internet services	90	11 s	117 ms
Friendbuy	131	11 s	80 ms
Twitter Online Conversion Tracking	169	10 s	62 ms
AliveChat	157	10 s	66 ms
Flickr	137	10 s	76 ms
AIR.TV	119	10 s	87 ms
Swoop	131	10 s	78 ms
Covert Pics	142	10 s	72 ms
Ziff Davis Tech	121	10 s	84 ms
HotelsCombined	63	10 s	158 ms
Reactful	81	10 s	120 ms
Polldaddy	97	10 s	99 ms
OnScroll	95	10 s	101 ms
Ad6Media	55	9 s	171 ms
Eyeota	124	9 s	75 ms
Boomtrain	106	9 s	87 ms
Pagefair	124	9 s	73 ms
Tag Inspector	100	9 s	90 ms
Braintree Payments	73	9 s	123 ms
CANDDi	73	9 s	123 ms
Adunity	71	9 s	127 ms
Captify Media	99	9 s	87 ms
ContextWeb	117	8 s	73 ms
Mopinion	75	8 s	112 ms
NaviStone	81	8 s	103 ms
Freespee	96	8 s	83 ms
RichRelevance	54	8 s	147 ms
Flockler	74	8 s	104 ms
Qualtrics	51	8 s	151 ms
Attribution	74	7 s	100 ms
Klevu Search	101	7 s	73 ms
UPS i-parcel	52	7 s	140 ms
Nanorep	55	7 s	132 ms
Catchpoint	76	7 s	96 ms
Improve Digital	54	7 s	131 ms
Sailthru	101	7 s	69 ms
Bookatable	70	7 s	99 ms
ARM	53	7 s	129 ms
MathJax	56	7 s	121 ms
Netlify	77	7 s	87 ms
Oracle Recommendations On Demand	86	7 s	76 ms
content.ad	54	6 s	119 ms
Barilliance	74	6 s	86 ms
Cookie Reports	83	6 s	76 ms
YoYo	72	6 s	82 ms
Raygun	69	6 s	85 ms
UpSellit	56	6 s	104 ms
Conversio	76	6 s	75 ms
Site24x7 Real User Monitoring	72	5 s	74 ms
DistroScale	59	5 s	89 ms
Fastly Insights	86	5 s	60 ms
Browser-Update.org	73	5 s	70 ms
Adobe Scene7	63	5 s	80 ms
eGain	65	5 s	77 ms
Bluecore	55	5 s	90 ms
StackAdapt	63	5 s	78 ms
Sociomantic Labs	68	5 s	70 ms
AdCurve	59	5 s	77 ms
MailPlus	78	4 s	56 ms
Fastest Forward	54	4 s	78 ms
Soundest	55	4 s	76 ms
Click4Assistance	52	4 s	80 ms
Xaxis	52	4 s	79 ms
Realytics	52	4 s	78 ms
SurveyMonkey	77	4 s	51 ms
StackExchange	57	4 s	69 ms
PrintFriendly	76	4 s	49 ms
Ekm Systems	60	4 s	61 ms
ShopStorm	55	3 s	62 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.