Third Party Web

Check out the shiny new web UI https://www.thirdpartyweb.today/

Data on third party entities and their impact on the web.

This document is a summary of which third party scripts are most responsible for excessive JavaScript execution on the web today.

Table of Contents

1. Goals
2. Methodology
3. NPM Module
4. Updates
5. Data
   1. Summary
   2. How to Interpret
   3. Third Parties by Category
      1. Advertising
      2. Analytics
      3. Social
      4. Video
      5. Developer Utilities
      6. Hosting Platforms
      7. Marketing
      8. Customer Success
      9. Content & Publishing
      10. CDNs
      11. Tag Management
      12. Mixed / Other
   4. Third Parties by Total Impact
6. Future Work
7. FAQs
8. Contributing

Goals

1. Quantify the impact of third party scripts on the web.
2. Identify the third party scripts on the web that have the greatest performance cost.
3. Give developers the information they need to make informed decisions about which third parties to include on their sites.
4. Incentivize responsible third party script behavior.
5. Make this information accessible and useful.

Methodology

HTTP Archive is an inititiave that tracks how the web is built. Every month, ~4 million sites are crawled with Lighthouse on mobile. Lighthouse breaks down the total script execution time of each page and attributes the execution to a URL. Using BigQuery, this project aggregates the script execution to the origin-level and assigns each origin to the responsible entity.

NPM Module

The entity classification data is available as an NPM module.

const {getEntity} = require('third-party-web')
const entity = getEntity('https://d36mpcpuzc4ztk.cloudfront.net/js/visitor.js')
console.log(entity)
//   {
//     "name": "Freshdesk",
//     "homepage": "https://freshdesk.com/",
//     "categories": ["customer-success"],
//     "domains": ["d36mpcpuzc4ztk.cloudfront.net"]
//   }

Updates

2019-02-01 dataset

Huge props to WordAds for reducing their impact from ~2.5s to ~200ms on average! A few entities are showing considerably less data this cycle (Media Math, Crazy Egg, DoubleVerify, Bootstrap CDN). Perhaps they've added new CDNs/hostnames that we haven't identified or the basket of sites in HTTPArchive has shifted away from their usage.

2019-03-01 dataset

Almost 2,000 entities tracked now across ~3,000+ domains! Huge props to @simonhearne for making this massive increase possible. Tag Managers have now been split out into their own category since they represented such a large percentage of the "Mixed / Other" category.

2019-05-06 dataset

Google Ads clarified that www.googletagservices.com serves more ad scripts than generic tag management, and it has been reclassified accordingly. This has dropped the overall Tag Management share considerably back down to its earlier position.

2019-05-13 dataset

A shortcoming of the attribution approach has been fixed. Total usage is now reported based on the number of pages in the dataset that use the third-party, not the number of scripts. Correspondingly, all average impact times are now reported per page rather than per script. Previously, a third party could appear to have a lower impact or be more popular simply by splitting their work across multiple files.

Third-parties that performed most of their work from a single script should see little to no impact from this change, but some entities have seen significant ranking movement. Hosting providers that host entire pages are, understandably, the most affected.

Some notable changes below:

Third-Party	Previously (per-script)	Now (per-page)
Beeketing	137 ms	465 ms
Sumo	263 ms	798 ms
Tumblr	324 ms	1499 ms
Yandex APIs	393 ms	1231 ms
Google Ads	402 ms	1285 ms
Wix	972 ms	5393 ms

Data

Summary

Across top ~4 million sites, ~2700 origins account for ~57% of all script execution time with the top 50 entities already accounting for ~47%. Third party script execution is the majority chunk of the web today, and it's important to make informed choices.

How to Interpret

Each entity has a number of data points available.

1. Usage (Total Number of Occurrences) - how many scripts from their origins were included on pages
2. Total Impact (Total Execution Time) - how many seconds were spent executing their scripts across the web
3. Average Impact (Average Execution Time) - on average, how many milliseconds were spent executing each script
4. Category - what type of script is this

Third Parties by Category

This section breaks down third parties by category. The third parties in each category are ranked from first to last based on the average impact of their scripts. Perhaps the most important comparisons lie here. You always need to pick an analytics provider, but at least you can pick the most well-behaved analytics provider.

Overall Breakdown

Unsurprisingly, ads account for the largest identifiable chunk of third party script execution.

Advertising

These scripts are part of advertising networks, either serving or measuring.

Rank	Name	Usage	Average Impact
1	Nend	1,251	36 ms
2	ExoClick	1,778	52 ms
3	SublimeSkinz	1,216	53 ms
4	MailMunch	4,654	62 ms
5	Branch Metrics	1,050	64 ms
6	Tynt	25,003	70 ms
7	Adyoulike	1,614	72 ms
8	Rakuten Marketing	1,611	73 ms
9	FreakOut	3,870	76 ms
10	PushCrew	3,621	78 ms
11	BlueKai	3,976	78 ms
12	Constant Contact	1,563	79 ms
13	District M	6,744	81 ms
14	Gemius	7,344	88 ms
15	Nativo	1,124	96 ms
16	i-mobile	4,577	99 ms
17	Adroll	5,404	100 ms
18	Media Math	2,081	104 ms
19	Popads	2,997	105 ms
20	Unbounce	2,684	110 ms
21	DTSCOUT	4,476	113 ms
22	STINGRAY	2,475	113 ms
23	LINE Corporation	4,292	114 ms
24	Sharethrough	2,059	114 ms
25	Outbrain	4,723	116 ms
26	Refersion	1,371	117 ms
27	Intercept Interactive	1,005	117 ms
28	JuicyAds	2,030	120 ms
29	Bizible	1,260	133 ms
30	SmartAdServer	3,396	142 ms
31	Index Exchange	5,008	143 ms
32	Rubicon Project	35,955	145 ms
33	Scorecard Research	28,766	148 ms
34	IPONWEB	1,185	149 ms
35	Bing Ads	16,223	151 ms
36	Skimbit	20,440	159 ms
37	Smart AdServer	2,419	163 ms
38	Yahoo!	9,248	165 ms
39	OptiMonk	1,374	172 ms
40	Sortable	1,580	176 ms
41	Adform	8,220	182 ms
42	Celtra	3,706	184 ms
43	Media.net	25,352	185 ms
44	Cxense	4,788	185 ms
45	Permutive	1,098	186 ms
46	Intent Media	6,992	187 ms
47	Amazon Ads	20,719	188 ms
48	Teads	4,827	201 ms
49	AOL / Oath / Verizon Media	2,073	212 ms
50	AppNexus	3,499	215 ms
51	Pubmatic	63,997	225 ms
52	Perfect Market	1,142	227 ms
53	Criteo	77,325	227 ms
54	TrafficStars	2,707	246 ms
55	WordAds	21,071	251 ms
56	sovrn	2,921	260 ms
57	Adverline Board	1,052	268 ms
58	Privy	11,761	278 ms
59	VigLink	8,175	279 ms
60	LongTail Ad Solutions	3,287	323 ms
61	OpenX	1,759	324 ms
62	Klaviyo	11,891	350 ms
63	Taboola	23,206	360 ms
64	piano	1,123	397 ms
65	Yandex Ads	25,094	399 ms
66	MGID	7,087	403 ms
67	RevJet	4,646	414 ms
68	Digioh	1,102	437 ms
69	HyperInzerce	1,377	455 ms
70	iBillboard	1,020	505 ms
71	Sizmek	3,909	535 ms
72	MediaVine	5,647	625 ms
73	Bridgewell DSP	21,594	638 ms
74	Admixer for Publishers	1,136	643 ms
75	Moat	20,045	666 ms
76	Simplicity Marketing	3,045	687 ms
77	SpringServer	1,385	709 ms
78	DoubleVerify	11,760	746 ms
79	LoyaltyLion	1,104	780 ms
80	Vidible	1,569	936 ms
81	Adloox	5,057	968 ms
82	Infolinks	3,657	983 ms
83	Integral Ad Science	28,273	983 ms
84	LKQD	1,747	1545 ms
85	fam	2,188	1779 ms
86	Google/Doubleclick Ads	650,727	1803 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	1,123	31 ms
2	WordPress Site Stats	2,206	61 ms
3	Treasure Data	4,493	63 ms
4	Roxr Software	2,142	65 ms
5	Amplitude Mobile Analytics	1,808	68 ms
6	StatCounter	10,171	68 ms
7	Searchanise	2,739	70 ms
8	Heap	2,831	74 ms
9	Google Analytics	1,314,344	74 ms
10	Mixpanel	6,235	78 ms
11	Chartbeat	4,901	78 ms
12	Hotjar	157,254	88 ms
13	Quantcast	3,031	89 ms
14	CallRail	7,392	94 ms
15	Parse.ly	3,198	102 ms
16	etracker	1,732	103 ms
17	Snowplow	7,030	112 ms
18	ContentSquare	1,452	115 ms
19	Marchex	4,398	115 ms
20	Nielsen NetRatings SiteCensus	11,993	115 ms
21	Baidu Analytics	12,418	119 ms
22	Net Reviews	2,464	162 ms
23	VWO	4,343	167 ms
24	Evidon	6,074	175 ms
25	Nosto	2,045	183 ms
26	Trust Pilot	13,820	189 ms
27	Crazy Egg	19,547	190 ms
28	Segment	9,598	192 ms
29	ForeSee	1,098	195 ms
30	FullStory	6,815	196 ms
31	BounceX	1,266	202 ms
32	UserReport	1,555	221 ms
33	mPulse	12,514	237 ms
34	Optimizely	11,328	248 ms
35	Histats	10,663	252 ms
36	Marketo	1,315	256 ms
37	Ezoic	4,219	292 ms
38	Gigya	5,826	308 ms
39	Clicktale	1,091	378 ms
40	Bazaarvoice	1,740	380 ms
41	Keen	2,615	405 ms
42	Inspectlet	5,822	411 ms
43	Snapchat	11,148	431 ms
44	Feefo.com	1,674	494 ms
45	Yandex Metrica	270,514	501 ms
46	Lucky Orange	8,042	517 ms
47	DigiTrust	1,701	519 ms
48	Salesforce	19,599	575 ms
49	Revolver Maps	1,106	583 ms
50	Mouseflow	1,743	625 ms
51	IBM Digital Analytics	1,082	875 ms
52	AB Tasty	3,363	1559 ms

Social

These scripts enable social features.

Rank	Name	Usage	Average Impact
1	AddToAny	25,069	69 ms
2	Shareaholic	3,465	82 ms
3	Pinterest	16,302	97 ms
4	VK	15,503	97 ms
5	Kakao	12,590	100 ms
6	LinkedIn	15,987	119 ms
7	Twitter	234,572	134 ms
8	Instagram	9,351	146 ms
9	Facebook	1,444,810	223 ms
10	Yandex Share	29,685	230 ms
11	ShareThis	36,317	279 ms
12	SocialShopWave	1,405	417 ms
13	AddThis	126,104	462 ms
14	Disqus	1,816	822 ms
15	PIXNET	48,146	1088 ms
16	LiveJournal	3,494	1622 ms
17	Tumblr	8,770	2146 ms

Video

These scripts enable video player and streaming functionality.

Rank	Name	Usage	Average Impact
1	Vimeo	14,147	249 ms
2	Brightcove	6,438	693 ms
3	Wistia	12,612	870 ms
4	YouTube	390,054	1618 ms

Developer Utilities

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

Rank	Name	Usage	Average Impact
1	Trusted Shops	2,280	36 ms
2	LightWidget	3,242	57 ms
3	Siteimprove	2,023	82 ms
4	GetSiteControl	1,638	95 ms
5	TRUSTe	1,869	99 ms
6	iubenda	13,029	99 ms
7	Optanon	1,682	101 ms
8	Affirm	1,927	105 ms
9	iovation	1,132	105 ms
10	New Relic	6,954	107 ms
11	Cookiebot	9,126	126 ms
12	Bold Commerce	11,050	138 ms
13	Sift Science	1,043	147 ms
14	Other Google APIs/SDKs	532,252	157 ms
15	AddEvent	1,326	161 ms
16	Swiftype	1,528	161 ms
17	TrustArc	4,796	163 ms
18	Amazon Pay	5,356	184 ms
19	Seznam	1,844	186 ms
20	MaxCDN Enterprise	2,085	223 ms
21	AppDynamics	1,667	223 ms
22	GitHub	1,198	257 ms
23	Distil Networks	10,078	336 ms
24	PayPal	12,485	353 ms
25	Cloudflare	36,203	361 ms
26	Stripe	18,462	397 ms
27	Google Maps	270,086	398 ms
28	Secomapp	1,635	438 ms
29	Bugsnag	1,314	465 ms
30	Sentry	11,033	466 ms
31	Rambler	9,143	612 ms
32	Fastly	5,142	716 ms
33	GoDaddy	6,086	831 ms
34	Mapbox	5,378	1048 ms
35	Yandex APIs	22,971	1057 ms
36	Esri ArcGIS	1,395	3005 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	WordPress	131,777	214 ms
2	Salesforce Commerce Cloud	2,659	357 ms
3	Blogger	24,739	464 ms
4	Squarespace	38,716	888 ms
5	Shopify	81,850	901 ms
6	Adobe Business Catalyst	3,927	1004 ms
7	CDK Dealer Management	3,517	1190 ms
8	Weebly	15,286	1227 ms
9	Dealer	9,017	1427 ms
10	Hatena Blog	16,314	1834 ms
11	Wix	49,666	5321 ms

Marketing

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

Rank	Name	Usage	Average Impact
1	RD Station	4,166	70 ms
2	iZooto	1,057	77 ms
3	Beeketing	3,369	81 ms
4	Listrak	1,132	145 ms
5	Ve	2,795	151 ms
6	Dataxu	3,325	152 ms
7	Hubspot	28,497	169 ms
8	Yotpo	12,756	203 ms
9	Mailchimp	21,068	211 ms
10	OptinMonster	9,053	264 ms
11	Pardot	1,398	436 ms
12	Albacross	1,894	516 ms
13	Bigcommerce	9,546	609 ms
14	Sumo	19,970	682 ms
15	Drift	6,172	1105 ms
16	PureCars	2,660	2017 ms
17	Tray Commerce	2,373	2448 ms

Customer Success

These scripts are from customer support/marketing providers that offer chat and contact solutions. These scripts are generally heavier in weight.

Rank	Name	Usage	Average Impact
1	SnapEngage	1,212	58 ms
2	Pure Chat	3,593	66 ms
3	Foursixty	1,310	70 ms
4	LivePerson	4,447	116 ms
5	iPerceptions	2,237	124 ms
6	Comm100	1,310	141 ms
7	iAdvize SAS	1,023	333 ms
8	Tidio Live Chat	9,086	350 ms
9	ContactAtOnce	3,478	368 ms
10	LiveChat	18,439	381 ms
11	Tawk.to	56,580	385 ms
12	Help Scout	1,949	403 ms
13	Intercom	14,468	411 ms
14	Jivochat	38,980	501 ms
15	Smartsupp	13,932	565 ms
16	Olark	7,205	653 ms
17	ZenDesk	69,743	756 ms

Content & Publishing

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

Rank	Name	Usage	Average Impact
1	Research Online	1,261	60 ms
2	Accuweather	1,783	117 ms
3	Tencent	1,258	137 ms
4	SnapWidget	3,085	157 ms
5	OpenTable	2,442	160 ms
6	Booking.com	2,472	170 ms
7	AMP	57,906	243 ms
8	Embedly	3,778	428 ms
9	Medium	1,238	429 ms
10	issuu	2,069	627 ms
11	Spotify	2,930	751 ms
12	SoundCloud	4,276	956 ms
13	Dailymotion	2,390	1258 ms
14	diplomawin.com	2,391	1259 ms
15	wudecops.com	2,395	1261 ms
16	skyeedu.com	2,398	1268 ms
17	diplomakuu.com	2,399	1269 ms

CDNs

These are a mixture of publicly hosted open source libraries (e.g. jQuery) served over different public CDNs and private CDN usage. This category is unique in that the origin may have no responsibility for the performance of what's being served. Note that rank here does not imply one CDN is better than the other. It simply indicates that the scripts being served from that origin are lighter/heavier than the ones served by another.

Rank	Name	Usage	Average Impact
1	Adobe TypeKit	11,673	105 ms
2	Yandex CDN	2,037	150 ms
3	Microsoft Hosted Libs	5,218	164 ms
4	jQuery CDN	169,655	197 ms
5	Unpkg	4,845	212 ms
6	Google CDN	903,117	236 ms
7	Azure Web Services	8,410	260 ms
8	Cloudflare CDN	110,489	275 ms
9	JSDelivr CDN	37,062	328 ms
10	Akamai	10,541	336 ms
11	FontAwesome CDN	37,844	357 ms
12	Monotype	4,992	552 ms
13	CreateJS CDN	8,992	2674 ms

Tag Management

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

Rank	Name	Usage	Average Impact
1	BrightTag / Signal	7,780	114 ms
2	TagCommander	1,205	119 ms
3	Google Tag Manager	612,837	120 ms
4	Adobe Tag Manager	32,900	309 ms
5	Tealium	13,033	340 ms
6	Ensighten	5,412	476 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	40,733	153 ms
2	ResponsiveVoice	1,039	290 ms
3	All Other 3rd Parties	1,359,375	298 ms
4	Parking Crew	11,470	362 ms
5	uLogin	2,312	1192 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	650,727	1,173,204 s	1803 ms
YouTube	390,054	631,295 s	1618 ms
All Other 3rd Parties	1,359,375	404,459 s	298 ms
Facebook	1,444,810	322,129 s	223 ms
Wix	49,666	264,250 s	5321 ms
Google CDN	903,117	212,688 s	236 ms
Yandex Metrica	270,514	135,500 s	501 ms
Google Maps	270,086	107,550 s	398 ms
Google Analytics	1,314,344	97,492 s	74 ms
Other Google APIs/SDKs	532,252	83,662 s	157 ms
Shopify	81,850	73,774 s	901 ms
Google Tag Manager	612,837	73,394 s	120 ms
AddThis	126,104	58,199 s	462 ms
ZenDesk	69,743	52,694 s	756 ms
PIXNET	48,146	52,368 s	1088 ms
Squarespace	38,716	34,398 s	888 ms
jQuery CDN	169,655	33,429 s	197 ms
Twitter	234,572	31,320 s	134 ms
Cloudflare CDN	110,489	30,408 s	275 ms
Hatena Blog	16,314	29,919 s	1834 ms
WordPress	131,777	28,140 s	214 ms
Integral Ad Science	28,273	27,793 s	983 ms
Yandex APIs	22,971	24,273 s	1057 ms
CreateJS CDN	8,992	24,041 s	2674 ms
Tawk.to	56,580	21,773 s	385 ms
Jivochat	38,980	19,527 s	501 ms
Tumblr	8,770	18,816 s	2146 ms
Weebly	15,286	18,754 s	1227 ms
Criteo	77,325	17,566 s	227 ms
Pubmatic	63,997	14,390 s	225 ms
AMP	57,906	14,063 s	243 ms
Hotjar	157,254	13,817 s	88 ms
Bridgewell DSP	21,594	13,785 s	638 ms
Sumo	19,970	13,627 s	682 ms
FontAwesome CDN	37,844	13,505 s	357 ms
Moat	20,045	13,350 s	666 ms
Cloudflare	36,203	13,058 s	361 ms
Dealer	9,017	12,870 s	1427 ms
JSDelivr CDN	37,062	12,163 s	328 ms
Blogger	24,739	11,482 s	464 ms
Salesforce	19,599	11,270 s	575 ms
Wistia	12,612	10,968 s	870 ms
Adobe Tag Manager	32,900	10,173 s	309 ms
ShareThis	36,317	10,135 s	279 ms
Yandex Ads	25,094	10,005 s	399 ms
DoubleVerify	11,760	8,768 s	746 ms
Taboola	23,206	8,344 s	360 ms
Smartsupp	13,932	7,872 s	565 ms
Stripe	18,462	7,329 s	397 ms
LiveChat	18,439	7,029 s	381 ms
Yandex Share	29,685	6,834 s	230 ms
Drift	6,172	6,821 s	1105 ms
Amazon Web Services	40,733	6,235 s	153 ms
Intercom	14,468	5,945 s	411 ms
Bigcommerce	9,546	5,812 s	609 ms
Tray Commerce	2,373	5,809 s	2448 ms
LiveJournal	3,494	5,669 s	1622 ms
Mapbox	5,378	5,634 s	1048 ms
Rambler	9,143	5,597 s	612 ms
PureCars	2,660	5,366 s	2017 ms
WordAds	21,071	5,297 s	251 ms
AB Tasty	3,363	5,243 s	1559 ms
Rubicon Project	35,955	5,229 s	145 ms
Sentry	11,033	5,144 s	466 ms
GoDaddy	6,086	5,055 s	831 ms
Adloox	5,057	4,895 s	968 ms
Hubspot	28,497	4,829 s	169 ms
Snapchat	11,148	4,808 s	431 ms
Olark	7,205	4,708 s	653 ms
Media.net	25,352	4,691 s	185 ms
Brightcove	6,438	4,459 s	693 ms
Mailchimp	21,068	4,441 s	211 ms
Tealium	13,033	4,425 s	340 ms
PayPal	12,485	4,412 s	353 ms
Scorecard Research	28,766	4,267 s	148 ms
Esri ArcGIS	1,395	4,191 s	3005 ms
CDK Dealer Management	3,517	4,184 s	1190 ms
Klaviyo	11,891	4,160 s	350 ms
Lucky Orange	8,042	4,154 s	517 ms
Parking Crew	11,470	4,151 s	362 ms
SoundCloud	4,276	4,086 s	956 ms
Adobe Business Catalyst	3,927	3,942 s	1004 ms
fam	2,188	3,892 s	1779 ms
Amazon Ads	20,719	3,889 s	188 ms
Crazy Egg	19,547	3,721 s	190 ms
Fastly	5,142	3,680 s	716 ms
Infolinks	3,657	3,594 s	983 ms
Akamai	10,541	3,543 s	336 ms
MediaVine	5,647	3,528 s	625 ms
Vimeo	14,147	3,520 s	249 ms
Distil Networks	10,078	3,391 s	336 ms
Privy	11,761	3,266 s	278 ms
Skimbit	20,440	3,259 s	159 ms
Tidio Live Chat	9,086	3,179 s	350 ms
Dailymotion	2,390	3,007 s	1258 ms
mPulse	12,514	2,962 s	237 ms
MGID	7,087	2,853 s	403 ms
Optimizely	11,328	2,808 s	248 ms
Monotype	4,992	2,757 s	552 ms
uLogin	2,312	2,755 s	1192 ms
LKQD	1,747	2,700 s	1545 ms
Histats	10,663	2,684 s	252 ms
Trust Pilot	13,820	2,606 s	189 ms
Yotpo	12,756	2,591 s	203 ms
Ensighten	5,412	2,577 s	476 ms
Bing Ads	16,223	2,442 s	151 ms
Inspectlet	5,822	2,393 s	411 ms
OptinMonster	9,053	2,386 s	264 ms
VigLink	8,175	2,284 s	279 ms
Spotify	2,930	2,200 s	751 ms
文凭购买	2,930	2,200 s	751 ms
购买毕业证	2,930	2,200 s	751 ms
毕业证购买	2,930	2,200 s	751 ms
大学文凭	2,930	2,200 s	751 ms
留信网认证	2,930	2,200 s	751 ms
留信认证	2,930	2,200 s	751 ms
留信认证办理	2,930	2,200 s	751 ms
留信网	2,930	2,200 s	751 ms
Azure Web Services	8,410	2,186 s	260 ms
WebsiteBuilder.com	672	2,146 s	3194 ms
Sizmek	3,909	2,091 s	535 ms
Simplicity Marketing	3,045	2,091 s	687 ms
RevJet	4,646	1,924 s	414 ms
LinkedIn	15,987	1,902 s	119 ms
Segment	9,598	1,840 s	192 ms
Gigya	5,826	1,792 s	308 ms
Tynt	25,003	1,748 s	70 ms
AddToAny	25,069	1,721 s	69 ms
Embedly	3,778	1,615 s	428 ms
Pinterest	16,302	1,576 s	97 ms
Bold Commerce	11,050	1,527 s	138 ms
Yahoo!	9,248	1,521 s	165 ms
VK	15,503	1,501 s	97 ms
Adform	8,220	1,495 s	182 ms
Twitch	823	1,494 s	1816 ms
Blindado	681	1,494 s	2193 ms
Disqus	1,816	1,492 s	822 ms
Baidu Analytics	12,418	1,482 s	119 ms
Vidible	1,569	1,469 s	936 ms
Nielsen NetRatings SiteCensus	11,993	1,382 s	115 ms
Instagram	9,351	1,370 s	146 ms
FullStory	6,815	1,335 s	196 ms
Intent Media	6,992	1,307 s	187 ms
issuu	2,069	1,297 s	627 ms
iubenda	13,029	1,296 s	99 ms
ContactAtOnce	3,478	1,278 s	368 ms
Kakao	12,590	1,259 s	100 ms
Ezoic	4,219	1,234 s	292 ms
Adobe TypeKit	11,673	1,230 s	105 ms
Cookiebot	9,126	1,149 s	126 ms
Mouseflow	1,743	1,090 s	625 ms
AdMatic	996	1,074 s	1079 ms
LongTail Ad Solutions	3,287	1,062 s	323 ms
Evidon	6,074	1,060 s	175 ms
Keen	2,615	1,059 s	405 ms
Dynamic Yield	942	1,028 s	1091 ms
Unpkg	4,845	1,026 s	212 ms
Amazon Pay	5,356	983 s	184 ms
SpringServer	1,385	982 s	709 ms
Albacross	1,894	978 s	516 ms
Teads	4,827	971 s	201 ms
Salesforce Commerce Cloud	2,659	950 s	357 ms
IBM Digital Analytics	1,082	946 s	875 ms
Cxense	4,788	887 s	185 ms
BrightTag / Signal	7,780	885 s	114 ms
DigiTrust	1,701	884 s	519 ms
LoyaltyLion	1,104	861 s	780 ms
Microsoft Hosted Libs	5,218	854 s	164 ms
Feefo.com	1,674	827 s	494 ms
Help Scout	1,949	786 s	403 ms
Snowplow	7,030	785 s	112 ms
TrustArc	4,796	781 s	163 ms
StickyADS.tv	858	775 s	904 ms
sovrn	2,921	759 s	260 ms
AppNexus	3,499	752 s	215 ms
New Relic	6,954	746 s	107 ms
Yieldify	566	735 s	1299 ms
Admixer for Publishers	1,136	730 s	643 ms
VWO	4,343	727 s	167 ms
Ecwid	973	716 s	735 ms
Secomapp	1,635	715 s	438 ms
Index Exchange	5,008	714 s	143 ms
Kaltura Video Platform	487	697 s	1432 ms
CallRail	7,392	697 s	94 ms
StatCounter	10,171	697 s	68 ms
SessionCam	888	683 s	769 ms
Celtra	3,706	681 s	184 ms
TINT	288	680 s	2363 ms
TrafficStars	2,707	666 s	246 ms
Bazaarvoice	1,740	660 s	380 ms
Gemius	7,344	650 s	88 ms
Revolver Maps	1,106	645 s	583 ms
Okas Concepts	622	642 s	1032 ms
HyperInzerce	1,377	627 s	455 ms
Heroku	949	626 s	659 ms
Bugsnag	1,314	611 s	465 ms
Pardot	1,398	610 s	436 ms
SocialShopWave	1,405	586 s	417 ms
33 Across	744	574 s	772 ms
OpenX	1,759	570 s	324 ms
Wicked Reports	657	567 s	863 ms
Quantum Metric	536	559 s	1043 ms
Outbrain	4,723	550 s	116 ms
District M	6,744	545 s	81 ms
Adroll	5,404	538 s	100 ms
Medium	1,238	531 s	429 ms
Sekindo	296	526 s	1775 ms
LivePerson	4,447	516 s	116 ms
iBillboard	1,020	515 s	505 ms
Hotmart	239	507 s	2119 ms
Marchex	4,398	506 s	115 ms
Dataxu	3,325	504 s	152 ms
DTSCOUT	4,476	504 s	113 ms
LINE Corporation	4,292	490 s	114 ms
SnapWidget	3,085	486 s	157 ms
Mixpanel	6,235	485 s	78 ms
SmartAdServer	3,396	481 s	142 ms
Digioh	1,102	481 s	437 ms
Meetrics	780	472 s	605 ms
MaxCDN Enterprise	2,085	464 s	223 ms
BannerFlow	828	454 s	549 ms
i-mobile	4,577	451 s	99 ms
Supership	697	447 s	642 ms
piano	1,123	446 s	397 ms
AOL / Oath / Verizon Media	2,073	440 s	212 ms
Adocean	818	427 s	521 ms
Fort Awesome	825	426 s	516 ms
Ve	2,795	421 s	151 ms
Vidyard	412	420 s	1020 ms
Booking.com	2,472	419 s	170 ms
Clicktale	1,091	412 s	378 ms
Net Reviews	2,464	400 s	162 ms
Smart AdServer	2,419	393 s	163 ms
OpenTable	2,442	392 s	160 ms
Zmags	159	385 s	2422 ms
Chartbeat	4,901	384 s	78 ms
Media Management Technologies	663	377 s	569 ms
Nosto	2,045	374 s	183 ms
AppDynamics	1,667	372 s	223 ms
TrackJS	840	365 s	434 ms
Tribal Fusion	915	353 s	386 ms
LoopMe	510	344 s	675 ms
UserReport	1,555	343 s	221 ms
Seznam	1,844	342 s	186 ms
iAdvize SAS	1,023	341 s	333 ms
StreamRail	223	340 s	1526 ms
Marketo	1,315	337 s	256 ms
Parse.ly	3,198	327 s	102 ms
Signyfyd	282	321 s	1137 ms
Audience 360	432	320 s	741 ms
Technorati	637	315 s	495 ms
Popads	2,997	314 s	105 ms
BlueKai	3,976	309 s	78 ms
ThreatMetrix	253	308 s	1219 ms
GitHub	1,198	307 s	257 ms
Yandex CDN	2,037	306 s	150 ms
Dynatrace	397	305 s	767 ms
ResponsiveVoice	1,039	301 s	290 ms
Wishpond Technologies	667	300 s	449 ms
Unbounce	2,684	296 s	110 ms
FreakOut	3,870	295 s	76 ms
RD Station	4,166	292 s	70 ms
MailMunch	4,654	288 s	62 ms
Treasure Data	4,493	285 s	63 ms
Shareaholic	3,465	282 s	82 ms
Adverline Board	1,052	282 s	268 ms
PushCrew	3,621	281 s	78 ms
STINGRAY	2,475	280 s	113 ms
Between Digital	516	279 s	541 ms
Sortable	1,580	279 s	176 ms
iPerceptions	2,237	278 s	124 ms
Verizon Digital Media CDN	272	278 s	1020 ms
Decibel Insight	567	275 s	485 ms
Beeketing	3,369	274 s	81 ms
Ooyala	367	273 s	745 ms
Quantcast	3,031	269 s	89 ms
Maxymiser	899	264 s	294 ms
Perfect Market	1,142	259 s	227 ms
Yieldmo	748	257 s	344 ms
BounceX	1,266	256 s	202 ms
Auto Link Maker	891	252 s	283 ms
ZEDO	418	250 s	598 ms
Pixlee	447	247 s	553 ms
Swiftype	1,528	247 s	161 ms
Opta	407	245 s	603 ms
FirstImpression	465	244 s	524 ms
JuicyAds	2,030	244 s	120 ms
Reviews.co.uk	622	242 s	390 ms
Pure Chat	3,593	238 s	66 ms
SearchSpring	383	238 s	621 ms
Market GID	731	237 s	324 ms
OptiMonk	1,374	236 s	172 ms
Sharethrough	2,059	236 s	114 ms
Experian Cross-Channel Marketing Platform	139	233 s	1679 ms
Polar	841	229 s	272 ms
GIPHY	187	223 s	1195 ms
Media Math	2,081	217 s	104 ms
AddEvent	1,326	214 s	161 ms
ForeSee	1,098	214 s	195 ms
Accuweather	1,783	209 s	117 ms
Heap	2,831	208 s	74 ms
Knight Lab	172	206 s	1200 ms
Permutive	1,098	205 s	186 ms
Connatix	223	205 s	918 ms
Affirm	1,927	202 s	105 ms
Kampyle	882	196 s	222 ms
Po.st	815	193 s	237 ms
Snacktools	644	192 s	298 ms
Searchanise	2,739	191 s	70 ms
LightWidget	3,242	186 s	57 ms
TRUSTe	1,869	186 s	99 ms
Comm100	1,310	185 s	141 ms
Pagely	757	182 s	240 ms
etracker	1,732	179 s	103 ms
Stackla PTY	297	179 s	602 ms
IPONWEB	1,185	176 s	149 ms
Monetate	870	175 s	201 ms
Opentag	869	174 s	200 ms
Rackspace	801	173 s	216 ms
Tencent	1,258	172 s	137 ms
Optanon	1,682	169 s	101 ms
Expedia	131	169 s	1289 ms
Bizible	1,260	168 s	133 ms
ContentSquare	1,452	166 s	115 ms
Siteimprove	2,023	166 s	82 ms
Listrak	1,132	164 s	145 ms
LiveTex	751	163 s	217 ms
Clerk.io ApS	884	162 s	183 ms
PowerReviews	906	161 s	177 ms
SpotXchange	537	160 s	298 ms
Refersion	1,371	160 s	117 ms
eBay	819	157 s	192 ms
WisePops	649	157 s	242 ms
Fraudlogix	628	156 s	249 ms
GetSiteControl	1,638	156 s	95 ms
Convert Insights	977	155 s	159 ms
Sift Science	1,043	153 s	147 ms
Click Guardian	265	153 s	577 ms
MonetizeMore	256	152 s	593 ms
Touch Commerce	154	151 s	978 ms
Vox Media	355	149 s	419 ms
Hola Networks	200	148 s	741 ms
PageSense	903	148 s	164 ms
Forter	471	146 s	310 ms
Bronto Software	954	145 s	152 ms
TagCommander	1,205	144 s	119 ms
Investis	74	140 s	1895 ms
Roxr Software	2,142	139 s	65 ms
Reviews.io	217	137 s	630 ms
WordPress Site Stats	2,206	134 s	61 ms
Calendly	196	134 s	683 ms
Global-e	291	133 s	459 ms
mParticle	349	132 s	378 ms
PerimeterX Bot Defender	248	130 s	526 ms
Qubit Deliver	318	130 s	410 ms
Forensiq	524	130 s	248 ms
Marketplace Web Service	273	128 s	468 ms
Constant Contact	1,563	123 s	79 ms
Amplitude Mobile Analytics	1,808	122 s	68 ms
plista	726	122 s	168 ms
Moovweb	58	121 s	2086 ms
Curalate	379	120 s	317 ms
Skype	709	120 s	170 ms
iovation	1,132	119 s	105 ms
Intercept Interactive	1,005	118 s	117 ms
Cloudinary	395	117 s	297 ms
Rakuten Marketing	1,611	117 s	73 ms
AvantLink	181	116 s	643 ms
Adyoulike	1,614	116 s	72 ms
Underdog Media	303	116 s	381 ms
WebpageFX	405	113 s	279 ms
Evergage	493	112 s	227 ms
Gfycat	66	108 s	1634 ms
Nativo	1,124	107 s	96 ms
Auth0	252	107 s	423 ms
TripAdvisor	603	106 s	176 ms
Freshdesk	738	105 s	143 ms
Flickr	240	105 s	436 ms
GetIntent RTBSuite	173	103 s	594 ms
Yottaa	263	102 s	388 ms
[24]7	131	100 s	760 ms
Unruly Media	449	99 s	221 ms
Bootstrap Chinese network	378	99 s	263 ms
Symantec	978	99 s	101 ms
Mather Economics	711	98 s	138 ms
Github	803	98 s	122 ms
Revcontent	478	96 s	201 ms
Flowplayer	396	96 s	242 ms
Apester	378	95 s	253 ms
ExoClick	1,778	93 s	52 ms
Covert Pics	378	92 s	242 ms
Foursixty	1,310	92 s	70 ms
Adthink	77	88 s	1142 ms
Concert	356	87 s	245 ms
Usabilla	850	87 s	103 ms
WebEngage	590	85 s	144 ms
Trusted Shops	2,280	83 s	36 ms
Playbuzz	193	82 s	426 ms
iZooto	1,057	81 s	77 ms
Lytics	609	81 s	133 ms
Livefyre	238	81 s	340 ms
infogr.am	66	81 s	1220 ms
WalkMe	149	79 s	528 ms
Interpublic Group	449	78 s	173 ms
Attentive	649	78 s	120 ms
GetResponse	886	78 s	87 ms
Onet	150	77 s	515 ms
Smart Insight Tracking	895	76 s	85 ms
Research Online	1,261	76 s	60 ms
Sidecar	256	75 s	293 ms
BoldChat	451	74 s	163 ms
Geniee	901	73 s	81 ms
AIR.TV	692	73 s	106 ms
Shopgate	324	71 s	221 ms
Janrain	122	71 s	583 ms
SnapEngage	1,212	71 s	58 ms
DMD Marketing	320	71 s	221 ms
Snack Media	294	71 s	240 ms
rewardStyle.com	491	71 s	144 ms
AddShoppers	467	69 s	148 ms
Kameleoon	182	69 s	377 ms
Keywee	435	68 s	156 ms
Typepad	333	68 s	204 ms
Arbor	357	68 s	189 ms
Picreel	511	67 s	132 ms
FoxyCart	329	67 s	205 ms
Branch Metrics	1,050	67 s	64 ms
Adkontekst	238	67 s	281 ms
Weborama	505	64 s	127 ms
SublimeSkinz	1,216	64 s	53 ms
AdSniper	160	63 s	394 ms
Mobify	120	63 s	523 ms
Adobe Test & Target	92	62 s	670 ms
Adition	300	62 s	205 ms
News	192	61 s	320 ms
Wufoo	777	61 s	79 ms
The Hut Group	236	61 s	258 ms
InSkin Media	82	61 s	739 ms
MaxMind	330	60 s	182 ms
Simpli.fi	347	59 s	170 ms
Radar	607	59 s	97 ms
Impact Radius	211	58 s	274 ms
ClickDesk	664	58 s	87 ms
Ambassador	210	57 s	271 ms
Affiliate Window	907	56 s	61 ms
PlayAd Media Group	111	56 s	501 ms
unpkg	295	55 s	187 ms
Reevoo	195	55 s	280 ms
Pendo	512	53 s	104 ms
Cachefly	154	52 s	336 ms
Tail Target	517	51 s	99 ms
Bootstrap CDN	936	51 s	54 ms
Best Of Media S.A.	202	51 s	250 ms
ReachForce	56	50 s	888 ms
RebelMouse	50	49 s	987 ms
Postcode Anywhere (Holdings)	159	49 s	308 ms
OneSignal	428	48 s	112 ms
Adobe Scene7	525	48 s	91 ms
Autopilot	554	48 s	86 ms
ReCollect	69	48 s	690 ms
WebSpectator	205	47 s	230 ms
LinkedIn Ads	397	47 s	118 ms
AdsWizz	183	46 s	253 ms
Highcharts	353	46 s	130 ms
ShopRunner	96	46 s	479 ms
Profitshare	258	45 s	175 ms
Nend	1,251	45 s	36 ms
JustPremium Ads	378	45 s	118 ms
Google Plus	494	44 s	89 ms
Reflektion	129	43 s	333 ms
Kaizen Platform	197	43 s	216 ms
Pusher	128	42 s	332 ms
Sajari Pty	244	42 s	173 ms
Ad6Media	144	42 s	292 ms
LiveHelpNow	352	42 s	119 ms
reEmbed	206	42 s	204 ms
Moxie	119	42 s	352 ms
Adnium	229	41 s	181 ms
SurveyMonkey	256	41 s	161 ms
Crowd Control	582	41 s	71 ms
Spot.IM	112	41 s	366 ms
ReadSpeaker	382	41 s	107 ms
Survicate	235	41 s	174 ms
CPEx	275	41 s	149 ms
SaleCycle	580	41 s	70 ms
Zanox	311	41 s	131 ms
Appier	473	40 s	86 ms
Adyen	56	40 s	715 ms
Fresh Relevance	430	40 s	92 ms
Adscale	331	40 s	120 ms
Usersnap	128	39 s	305 ms
The Trade Desk	440	39 s	89 ms
AdRiver	200	39 s	195 ms
Riskified	548	37 s	68 ms
Conversant Tag Manager	147	37 s	254 ms
Gleam	397	37 s	94 ms
Clicktripz	365	37 s	102 ms
Tradelab	451	37 s	82 ms
Dynamic Converter	85	37 s	430 ms
IBM Acoustic Campaign	520	36 s	70 ms
Petametrics	246	36 s	148 ms
AudienceSearch	546	36 s	66 ms
Talkable	382	36 s	93 ms
Rocket Fuel	450	35 s	78 ms
Key CDN	288	35 s	122 ms
Alexa	1,123	35 s	31 ms
Socialphotos	207	35 s	169 ms
Effective Measure	458	34 s	74 ms
Madison Logic	465	34 s	73 ms
Braze	313	34 s	108 ms
Kargo	54	34 s	623 ms
Ipify	307	34 s	110 ms
Salesforce Live Agent	56	33 s	596 ms
Fastly Insights	563	33 s	58 ms
Vibrant Media	269	32 s	120 ms
Alchemy	81	32 s	397 ms
TruConversion	216	32 s	148 ms
ZergNet	54	32 s	591 ms
Sooqr Search	481	31 s	65 ms
fluct	747	31 s	42 ms
SkyScanner	126	31 s	246 ms
Vergic AB	106	30 s	285 ms
Tagboard	134	30 s	222 ms
MLveda	74	30 s	401 ms
Omniconvert	332	30 s	89 ms
Browsealoud	577	29 s	50 ms
DemandBase	339	28 s	83 ms
Salesforce.com	463	28 s	61 ms
Expedia USA	84	28 s	333 ms
Resonance Insights	122	28 s	229 ms
Advance Magazine Group	191	28 s	145 ms
Luigi’s Box	227	28 s	122 ms
Viacom	169	28 s	163 ms
Proper Media	124	27 s	220 ms
VoiceFive	283	27 s	96 ms
GumGum	524	27 s	51 ms
Transifex	126	26 s	207 ms
Conversion Labs	67	26 s	390 ms
Sparkflow	213	26 s	122 ms
KISSmetrics	396	26 s	66 ms
CNET Content Solutions	77	25 s	329 ms
Mediahawk	86	25 s	294 ms
User Replay	67	25 s	377 ms
Zarget	172	25 s	146 ms
Steelhouse	266	25 s	94 ms
Delta Projects AB	294	25 s	85 ms
Turn	305	25 s	82 ms
Reklama	211	24 s	115 ms
Qualaroo	366	24 s	66 ms
Customer.io	206	24 s	116 ms
Feedbackify	290	24 s	82 ms
Fanplayr	213	23 s	110 ms
FLXone	148	23 s	158 ms
Pingdom RUM	82	23 s	276 ms
Mopinion	136	22 s	164 ms
Sirv	250	22 s	89 ms
SlimCut Media Outstream	130	22 s	170 ms
Rakuten LinkShare	150	22 s	146 ms
Vivocha S.p.A	156	22 s	139 ms
Expedia Australia	55	22 s	395 ms
Edge Web Fonts	266	22 s	81 ms
bRealTime	161	22 s	134 ms
Vee24	73	21 s	294 ms
linkpulse	317	21 s	67 ms
Wow Analytics	118	21 s	175 ms
DialogTech	213	21 s	97 ms
Polldaddy	120	20 s	171 ms
Infinity Tracking	257	20 s	80 ms
AI Media Group	103	20 s	198 ms
Travelocity USA	54	20 s	377 ms
Vergic Engage Platform	80	20 s	250 ms
Sweet Tooth	230	20 s	87 ms
Opinion Stage	152	20 s	131 ms
Iterate	70	19 s	274 ms
Storygize	144	19 s	132 ms
PebblePost	65	19 s	291 ms
Civic	293	19 s	64 ms
Triblio	98	19 s	189 ms
epoq internet services	177	18 s	103 ms
Userzoom	103	18 s	176 ms
TechTarget	57	18 s	316 ms
CleverTap	228	18 s	78 ms
Barilliance	126	18 s	141 ms
AWeber	169	17 s	101 ms
LoginRadius	83	17 s	206 ms
Flockler	103	17 s	166 ms
ResponseTap	247	17 s	69 ms
Conversio	224	17 s	75 ms
Acceptable Ads	149	17 s	112 ms
NetAffiliation	174	17 s	96 ms
Dropbox	54	17 s	308 ms
Borderfree	57	16 s	286 ms
VidPulse	79	16 s	205 ms
RichRelevance	65	16 s	249 ms
Ghostery Enterprise	72	16 s	219 ms
Hull.js	92	16 s	170 ms
Republer	167	15 s	93 ms
Elastic Ad	176	15 s	87 ms
Alliance for Audited Media	61	15 s	250 ms
The Publisher Desk	55	15 s	275 ms
Cookie-Script.com	163	15 s	93 ms
Smartlook	51	15 s	295 ms
Accordant Media	211	15 s	71 ms
Hupso Website Analyzer	251	15 s	60 ms
OnScroll	140	15 s	106 ms
Bookatable	148	14 s	95 ms
Widespace	140	13 s	96 ms
Twitter Online Conversion Tracking	95	13 s	141 ms
Meltwater Group	84	13 s	158 ms
cloudIQ	117	13 s	113 ms
Qualtrics	112	13 s	118 ms
Klevu Search	218	13 s	59 ms
Friendbuy	116	13 s	111 ms
reddit	118	13 s	108 ms
Bluecore	159	12 s	78 ms
Fonecall	74	12 s	168 ms
The ADEX	213	12 s	58 ms
Pixalate	80	12 s	152 ms
Netlify	166	12 s	73 ms
Vertical Mass	69	12 s	171 ms
GoSquared	186	12 s	64 ms
Cookie Reports	119	12 s	97 ms
Elecard StreamEye	56	11 s	201 ms
CANDDi	80	11 s	141 ms
Woopra	151	11 s	74 ms
Optimove	102	11 s	109 ms
Prezi	59	11 s	187 ms
Tag Inspector	99	11 s	111 ms
One by AOL	51	11 s	215 ms
Rakuten MediaForge	69	11 s	155 ms
Drip	258	11 s	41 ms
Site24x7 Real User Monitoring	124	11 s	85 ms
CyberSource (Visa)	167	11 s	63 ms
Adobe Marketing Cloud	150	11 s	70 ms
Byside	62	10 s	166 ms
PowerFront	54	10 s	185 ms
Navegg	192	10 s	52 ms
Web Dissector	67	10 s	145 ms
MaxPoint Interactive	89	9 s	105 ms
TripleLift	81	9 s	115 ms
Datonics	128	9 s	72 ms
Exponea	146	9 s	63 ms
AnswerDash	72	9 s	127 ms
Microad	113	9 s	80 ms
Sonobi	75	9 s	121 ms
Reactful	83	9 s	107 ms
MailPlus	80	9 s	111 ms
Polyfill service	91	9 s	95 ms
Oracle Recommendations On Demand	96	8 s	88 ms
OwnerIQ	152	8 s	55 ms
JingDong	57	8 s	145 ms
HotelsCombined	69	8 s	119 ms
Raygun	83	8 s	97 ms
UPS i-parcel	65	8 s	121 ms
Exactag	80	8 s	98 ms
Betgenius	110	8 s	68 ms
Braintree Payments	77	7 s	97 ms
Remintrex	91	7 s	81 ms
AdTrue	64	7 s	115 ms
Attribution	112	7 s	65 ms
SecuredVisit	114	7 s	64 ms
StackAdapt	61	7 s	117 ms
Filestack	68	7 s	104 ms
CleverDATA	87	7 s	79 ms
Exponential Interactive	171	7 s	40 ms
ShopStorm	73	7 s	92 ms
Netmining	134	7 s	49 ms
Extole	60	7 s	109 ms
Ziff Davis Tech	100	7 s	65 ms
DistroScale	54	7 s	121 ms
Swoop	110	6 s	59 ms
TurnTo	59	6 s	108 ms
RightNow Service Cloud	60	6 s	105 ms
Council ad Network	91	6 s	69 ms
Freespee	77	6 s	81 ms
AdvertServe	72	6 s	85 ms
Sojern	92	6 s	64 ms
Realytics	91	6 s	65 ms
Video Media Groep	66	6 s	88 ms
Ekm Systems	113	6 s	50 ms
Mux	60	6 s	93 ms
UpSellit	64	5 s	86 ms
emetriq	92	5 s	59 ms
NaviStone	63	5 s	83 ms
Datacamp	65	5 s	80 ms
OneSoon	72	5 s	71 ms
AdSupply	51	5 s	95 ms
Intilery	62	5 s	78 ms
Sailthru	77	5 s	61 ms
Holimetrix	71	5 s	66 ms
Boomtrain	63	4 s	70 ms
Cardosa Enterprises	61	4 s	72 ms
Neodata	70	4 s	61 ms
DialogTech SourceTrak	77	4 s	55 ms
Aggregate Knowledge	65	4 s	63 ms
Perfect Audience	55	4 s	72 ms
Klarna	56	4 s	65 ms
Hawk Search	63	4 s	57 ms
JustUno	153	3 s	20 ms
Xaxis	54	3 s	56 ms
Catchpoint	56	3 s	53 ms
Fastest Forward	55	2 s	43 ms
Gravatar	52	2 s	38 ms
Reach Group	67	1 s	18 ms

Future Work

1. Introduce URL-level data for more fine-grained analysis, i.e. which libraries from Cloudflare/Google CDNs are most expensive.
2. Expand the scope, i.e. include more third parties and have greater entity/category coverage.

FAQs

I don't see entity X in the list. What's up with that?

This can be for one of several reasons:

1. The entity does not have references to their origin on at least 50 pages in the dataset.
2. The entity's origins have not yet been identified. See How can I contribute?

What is "Total Occurences"?

Total Occurrences is the number of pages on which the entity is included.

How is the "Average Impact" determined?

The HTTP Archive dataset includes Lighthouse reports for each URL on mobile. Lighthouse has an audit called "bootup-time" that summarizes the amount of time that each script spent on the main thread. The "Average Impact" for an entity is the total execution time of scripts whose domain matches one of the entity's domains divided by the total number of pages that included the entity.

Average Impact = Total Execution Time / Total Occurrences

How does Lighthouse determine the execution time of each script?

Lighthouse's bootup time audit attempts to attribute all toplevel main-thread tasks to a URL. A main thread task is attributed to the first script URL found in the stack. If you're interested in helping us improve this logic, see Contributing for details.

The data for entity X seems wrong. How can it be corrected?

Verify that the origins in data/entities.json5 are correct. Most issues will simply be the result of mislabelling of shared origins. If everything checks out, there is likely no further action and the data is valid. If you still believe there's errors, file an issue to discuss futher.

How can I contribute?

Only about 90% of the third party script execution has been assigned to an entity. We could use your help identifying the rest! See Contributing for details.

Contributing

Thanks

A huge thanks to @simonhearne and @soulgalore for their assistance in classifying additional domains!

Updating the Entities

The domain->entity mapping can be found in data/entities.json5. Adding a new entity is as simple as adding a new array item with the following form.

{
    "name": "Facebook",
    "homepage": "https://www.facebook.com",
    "categories": ["social"],
    "domains": [
        "*.facebook.com",
        "*.fbcdn.net"
    ],
    "examples": [
        "www.facebook.com",
        "connect.facebook.net",
        "staticxx.facebook.com",
        "static.xx.fbcdn.net",
        "m.facebook.com"
    ]
}

Updating Attribution Logic

The logic for attribution to individual script URLs can be found in the Lighthouse repo. File an issue over there to discuss further.

Updating the Data

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

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

Updating this README

This README is auto-generated from the templates lib/ and the computed data. In order to update the charts, you'll need to make sure you have cairo installed locally in addition to yarn install.

# Install `cairo` and dependencies for node-canvas
brew install pkg-config cairo pango libpng jpeg giflib
# Build the requirements in this repo
yarn build
# Regenerate the README
yarn start

Updating the website

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