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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.

breakdown by 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
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