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https://alistapart.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
0
REVIEW
5
PASS
10
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
97
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.70 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.41 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

62 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.011

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.70 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

4.13 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
10 PASS 5 REVIEW
B
Third-Party Impact
47% third-party, 0 ms blocking
REVIEW
47% third-party, 0 ms blocking
Info::
Third-party code accounts for 47% of page weight (192.8 KiB of 408.8 KiB)
Info::
Third-party blocking time is low (0 ms)
53%
47%
First-party Third-party
C
Image Optimization
Action
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://alistapart.com/wp-content/uploads/2026/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://i0.wp.com/alistapart.com/wp-content/upload... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://alistapart.com/wp-content/uploads/2019/03/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 78 KB
0 oversized -0 KB
10 legacy format
3 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
757ms total JS execution
REVIEW
757ms total JS execution
Info::
https://www.googletagmanager.com/gtag/js?id=G-F1JX...: 233ms CPU time
Info::
https://alistapart.com/: 232ms CPU time
Info::
Unattributable: 169ms CPU time
Info::
https://alistapart.com/wp-includes/js/jquery/jquer...: 65ms CPU time
Info::
https://www.google-analytics.com/analytics.js: 58ms CPU time
Warning::
Third-party scripts: 460ms (61% of total)

Main Thread Breakdown

Script Evaluation 42% Other 25% Style & Layout 18% Script Parsing & Compilation 7% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtag/js?id=G-F1JXXVHTDV233ms191ms39ms3rd
https://alistapart.com/232ms6ms3ms1st
Unattributable169ms5ms0ms3rd
https://alistapart.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.165ms48ms9ms1st
https://www.google-analytics.com/analytics.js58ms49ms4ms3rd
B
JS Bundles
13 scripts, 86 KB unused
REVIEW
13 scripts, 86 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-F1JX...: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://alistapart.com/wp-includes/js/jquery/jquer...: 22 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 86 KB
86 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-F1JXXVHTDV152 KB64 KB (42%)✓3rd
https://alistapart.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.131 KB22 KB (72%)✓1st
https://alistapart.com/wp-content/themes/ala/js/loadadchecka.js?ver=1.01 KB—✓1st
https://alistapart.com/wp-content/themes/ala/js/prism/prism.js?ver=1.04 KB—✓1st
https://alistapart.com/wp-content/themes/ala/js/skip-link-focus-fix.js?ver=201512151 KB—✓1st
https://alistapart.com/wp-content/themes/ala/js/adchecka.js?ver=1.00 KB—✓1st
https://alistapart.com/wp-content/themes/ala/js/navigation.js?ver=201512151 KB—✓1st
https://alistapart.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.15 KB—✓1st
https://stats.wp.com/e-202616.js2 KB—✓3rd
https://www.google-analytics.com/analytics.js21 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
409 KB transferred, 32 requests
PASS
409 KB transferred, 32 requests
Info::
Page weighs 967 KB (409 KB transferred)
Info::
32 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
409 KB / 2.4 MB budget
409 KB transferred
32 requests
0.08 g CO2 per page load
JavaScript 227.6 KiB 56%
Images 78.0 KiB 19%
Fonts 54.9 KiB 13%
CSS 30.6 KiB 7%
HTML 15.6 KiB 4%
Other 1.1 KiB 0%
Other 548 B 0%
Other 451 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
2 fonts (55 KB)
PASS
2 fonts (55 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

55 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.4 shttps://alistapart.com/wp-content/themes/ala/assets/fonts/franklin-itc-bold.woff2franklin-itc-bold.woff2 https://alistapart.com/wp-content/themes/ala/assets/fonts/franklin-itc-bold.woff2 — 28.6 KiB — 7 ms — font-display: swaphttps://alistapart.com/wp-content/themes/ala/assets/fonts/franklin-itc-light.woff2franklin-itc-light.woff2 https://alistapart.com/wp-content/themes/ala/assets/fonts/franklin-itc-light.woff2 — 26.3 KiB — 7 ms — font-display: swap
franklin-itc-bold.woff2 woff2 swap
Size 29 KB
Load time 7 ms
Start 110 ms
Risk FOUT — text flashes from fallback to web font
franklin-itc-light.woff2 woff2 swap
Size 26 KB
Load time 7 ms
Start 111 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
1
preload
—
dns-prefetch
7
prefetch
—

8 resource hints configured

A
Page Weight Inventory
32 resources · 409 KB · 86 KB savings available
PASS
32 resources · 409 KB · 86 KB savings available
Info::
Within 1MB page-weight target
Got: 409 KB
Info::
~86 KB of savings available
Warning::
12 third-party resources (47% of weight)
32 resources · 408.8 KiB · 12 third-party Within 1MB page-weight target
JavaScript 56% · 227.6 KiB
Image 19% · 79.1 KiB
Font 13% · 54.9 KiB
CSS 7% · 30.6 KiB
Document 4% · 15.6 KiB
Other 0% · 999 B

~86.5 KiB of savings available

Remove unused JavaScript: 86.5 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
HTTP Caching
max-age=239 (3 minutes)
PASS
max-age=239 (3 minutes)
Info::
Cache-Control header is set
Got: max-age=239, must-revalidate
Info::
Effective TTL: 3 minutes (max-age=239)
Info::
Last-Modified header present
Cache-Control

max-age=239, must-revalidate

DirectiveValueMeaning
max-age239Cache for 3 minutes
must-revalidate—Must recheck with server after expiry
Effective TTL: 239 seconds
Network Waterfall
32 requests over 732ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.4 shttps://alistapart.com// https://alistapart.com/ — 200 — 15.6 KiB — 13 ms — h2https://alistapart.com/wp-content/themes/ala/style.css?ver=1757090064/wp-content/themes/ala/style.css?ve... https://alistapart.com/wp-content/themes/ala/style.css?ver=1757090064 — 200 — 29.6 KiB — 13 ms — h2https://alistapart.com/wp-content/themes/ala/js/prism/prism.css?ver=1.0/wp-content/themes/ala/js/prism/pri... https://alistapart.com/wp-content/themes/ala/js/prism/prism.css?ver=1.0 — 200 — 1.0 KiB — 16 ms — h2https://alistapart.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1/wp-includes/js/jquery/jquery.min.j... https://alistapart.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 31.1 KiB — 18 ms — h2https://alistapart.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1/wp-includes/js/jquery/jquery-migra... https://alistapart.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.3 KiB — 14 ms — h2https://i0.wp.com/alistapart.com/wp-content/uploads/2019/03/ala-logo-big.png?resize=768%2C78&ssl=1i0.wp.com/alistapart.com/wp-content... https://i0.wp.com/alistapart.com/wp-content/uploads/2019/03/ala-logo-big.png?resize=768%2C78&ssl=1 — 200 — 5.0 KiB — 29 ms — h2https://alistapart.com/wp-content/uploads/2026/03/IDS_700x200_Logo-300x86.jpg/wp-content/uploads/2026/03/IDS_700... https://alistapart.com/wp-content/uploads/2026/03/IDS_700x200_Logo-300x86.jpg — 200 — 8.1 KiB — 13 ms — h2https://alistapart.com/wp-content/uploads/2019/03/logo_a-book-apart-color.png/wp-content/uploads/2019/03/logo_a-... https://alistapart.com/wp-content/uploads/2019/03/logo_a-book-apart-color.png — 200 — 2.8 KiB — 15 ms — h2https://i0.wp.com/alistapart.com/wp-content/uploads/2019/04/promo_aba_2.jpg?w=960&ssl=1i0.wp.com/alistapart.com/wp-content... https://i0.wp.com/alistapart.com/wp-content/uploads/2019/04/promo_aba_2.jpg?w=960&ssl=1 — 200 — 7.0 KiB — 10 ms — h2https://alistapart.com/wp-content/themes/ala/js/navigation.js?ver=20151215/wp-content/themes/ala/js/navigatio... https://alistapart.com/wp-content/themes/ala/js/navigation.js?ver=20151215 — 200 — 1.4 KiB — 10 ms — h3https://alistapart.com/wp-content/themes/ala/js/prism/prism.js?ver=1.0/wp-content/themes/ala/js/prism/pri... https://alistapart.com/wp-content/themes/ala/js/prism/prism.js?ver=1.0 — 200 — 4.3 KiB — 6 ms — h3https://alistapart.com/wp-content/themes/ala/js/skip-link-focus-fix.js?ver=20151215/wp-content/themes/ala/js/skip-link... https://alistapart.com/wp-content/themes/ala/js/skip-link-focus-fix.js?ver=20151215 — 200 — 747 B — 9 ms — h3https://alistapart.com/wp-content/themes/ala/js/adchecka.js?ver=1.0/wp-content/themes/ala/js/adchecka.... https://alistapart.com/wp-content/themes/ala/js/adchecka.js?ver=1.0 — 200 — 448 B — 9 ms — h3https://alistapart.com/wp-content/themes/ala/js/loadadchecka.js?ver=1.0/wp-content/themes/ala/js/loadadche... https://alistapart.com/wp-content/themes/ala/js/loadadchecka.js?ver=1.0 — 200 — 646 B — 10 ms — h3https://www.googletagmanager.com/gtag/js?id=G-F1JXXVHTDVwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-F1JXXVHTDV — 200 — 151.6 KiB — 247 ms — h2https://stats.wp.com/e-202616.jsstats.wp.com/e-202616.js https://stats.wp.com/e-202616.js — 200 — 1.7 KiB — 18 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 90 ms — h2https://alistapart.com/wp-content/themes/ala/assets/img/icon_hamburger.svg/wp-content/themes/ala/assets/img/i... https://alistapart.com/wp-content/themes/ala/assets/img/icon_hamburger.svg — 200 — 515 B — 7 ms — h3https://alistapart.com/wp-content/themes/ala/assets/img/noise.png/wp-content/themes/ala/assets/img/n... https://alistapart.com/wp-content/themes/ala/assets/img/noise.png — 200 — 50.2 KiB — 12 ms — h3https://alistapart.com/wp-content/themes/ala/assets/img/bg_for-people-who.svg/wp-content/themes/ala/assets/img/b... https://alistapart.com/wp-content/themes/ala/assets/img/bg_for-people-who.svg — 200 — 1.8 KiB — 12 ms — h3https://alistapart.com/wp-content/themes/ala/assets/img/logo_an-event-apart_mark.svg/wp-content/themes/ala/assets/img/l... https://alistapart.com/wp-content/themes/ala/assets/img/logo_an-event-apart_mark.svg — 200 — 875 B — 12 ms — h3https://alistapart.com/wp-content/themes/ala/assets/img/logo_a-book-apart_3.svg/wp-content/themes/ala/assets/img/l... https://alistapart.com/wp-content/themes/ala/assets/img/logo_a-book-apart_3.svg — 200 — 1.2 KiB — 9 ms — h3https://alistapart.com/wp-content/themes/ala/assets/fonts/franklin-itc-bold.woff2/wp-content/themes/ala/assets/fonts... https://alistapart.com/wp-content/themes/ala/assets/fonts/franklin-itc-bold.woff2 — 200 — 28.6 KiB — 7 ms — h3https://alistapart.com/wp-content/themes/ala/assets/fonts/franklin-itc-light.woff2/wp-content/themes/ala/assets/fonts... https://alistapart.com/wp-content/themes/ala/assets/fonts/franklin-itc-light.woff2 — 200 — 26.3 KiB — 7 ms — h3https://secure.gaug.es/track.jssecure.gaug.es/track.js https://secure.gaug.es/track.js — 200 — 4.0 KiB — 451 ms — http/1.1https://pixel.wp.com/g.gif?v=ext&blog=158094726&post=6000475&tz=-4&srv=alistapart.com&hp=atomic&ac=3&amp=0&j=1%3A15.8-a.1&host=alistapart.com&ref=&fcp=0&rand=0.20736936256199667pixel.wp.com/g.gif?v=ext&blog=15809... https://pixel.wp.com/g.gif?v=ext&blog=158094726&post=6000475&tz=-4&srv=alistapart.com&hp=atomic&ac=3&amp=0&j=1%3A15.8-a.1&host=alistapart.com&ref=&fcp=0&rand=0.20736936256199667 — 200 — 177 B — 19 ms — h2blob:https://alistapart.com/99d2eceb-feea-4dee-9734-713d3acc35cbalistapart.com/99d2eceb-feea-4dee-9... blob:https://alistapart.com/99d2eceb-feea-4dee-9734-713d3acc35cb — 200 — -1 B — 37 ms — blobhttps://www.google-analytics.com/j/collect?v=1&_v=j102&a=1696307047&t=pageview&_s=1&dl=https%3A%2F%2Falistapart.com%2F&ul=en-us&dt=A%20List%20Apart%20%E2%80%93%20For%20people%20who%20make%20websites&sr=412x823&vp=412x823&_u=IEBAAEABAAAAACAAI~&jid=1142533265&gjid=2020467244&cid=1637332648.1776295507&tid=UA-11757054-1&_gid=648970987.1776295507&_r=1&_slc=1&z=450684158www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1696307047&t=pageview&_s=1&dl=https%3A%2F%2Falistapart.com%2F&ul=en-us&dt=A%20List%20Apart%20%E2%80%93%20For%20people%20who%20make%20websites&sr=412x823&vp=412x823&_u=IEBAAEABAAAAACAAI~&jid=1142533265&gjid=2020467244&cid=1637332648.1776295507&tid=UA-11757054-1&_gid=648970987.1776295507&_r=1&_slc=1&z=450684158 — 200 — 451 B — 23 ms — h2https://alistapart.com/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4/wp-includes/js/wp-emoji-release.mi... https://alistapart.com/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4 — 200 — 5.5 KiB — 4 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-F1JXXVHTDV&gtm=45je64e1v890690997za200zd890690997&_p=1776295506797&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1637332648.1776295507&frm=0&pscdl=noapi&rcb=4&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~116363098~117266401~118128922&sid=1776295507&sct=1&seg=0&dl=https%3A%2F%2Falistapart.com%2F&dt=A%20List%20Apart%20%E2%80%93%20For%20people%20who%20make%20websites&en=page_view&_fv=1&_ss=1&_ee=1&tfd=379region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-F1JXXVHTDV&gtm=45je64e1v890690997za200zd890690997&_p=1776295506797&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1637332648.1776295507&frm=0&pscdl=noapi&rcb=4&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~116363098~117266401~118128922&sid=1776295507&sct=1&seg=0&dl=https%3A%2F%2Falistapart.com%2F&dt=A%20List%20Apart%20%E2%80%93%20For%20people%20who%20make%20websites&en=page_view&_fv=1&_ss=1&_ee=1&tfd=379 — 204 — 548 B — 64 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.4 shttps://alistapart.com// https://alistapart.com/ — 200 — 15.6 KiB — 13 ms — h2https://alistapart.com/wp-content/themes/ala/style.css?ver=1757090064/wp-content/themes/ala/style.css?ve... https://alistapart.com/wp-content/themes/ala/style.css?ver=1757090064 — 200 — 29.6 KiB — 13 ms — h2https://alistapart.com/wp-content/themes/ala/js/prism/prism.css?ver=1.0/wp-content/themes/ala/js/prism/pri... https://alistapart.com/wp-content/themes/ala/js/prism/prism.css?ver=1.0 — 200 — 1.0 KiB — 16 ms — h2https://alistapart.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1/wp-includes/js/jquery/jquery.min.j... https://alistapart.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 31.1 KiB — 18 ms — h2https://alistapart.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1/wp-includes/js/jquery/jquery-migra... https://alistapart.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.3 KiB — 14 ms — h2https://i0.wp.com/alistapart.com/wp-content/uploads/2019/03/ala-logo-big.png?resize=768%2C78&ssl=1i0.wp.com/alistapart.com/wp-content... https://i0.wp.com/alistapart.com/wp-content/uploads/2019/03/ala-logo-big.png?resize=768%2C78&ssl=1 — 200 — 5.0 KiB — 29 ms — h2https://alistapart.com/wp-content/uploads/2026/03/IDS_700x200_Logo-300x86.jpg/wp-content/uploads/2026/03/IDS_700... https://alistapart.com/wp-content/uploads/2026/03/IDS_700x200_Logo-300x86.jpg — 200 — 8.1 KiB — 13 ms — h2https://alistapart.com/wp-content/uploads/2019/03/logo_a-book-apart-color.png/wp-content/uploads/2019/03/logo_a-... https://alistapart.com/wp-content/uploads/2019/03/logo_a-book-apart-color.png — 200 — 2.8 KiB — 15 ms — h2https://i0.wp.com/alistapart.com/wp-content/uploads/2019/04/promo_aba_2.jpg?w=960&ssl=1i0.wp.com/alistapart.com/wp-content... https://i0.wp.com/alistapart.com/wp-content/uploads/2019/04/promo_aba_2.jpg?w=960&ssl=1 — 200 — 7.0 KiB — 10 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
61% of JavaScript execution is third-party
First-party Third-party 460ms · 173KB · $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 233ms
Transfer 152 KB
Unused 42%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 169ms
Transfer 0 KB
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 58ms
Transfer 21 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 233ms and costs ~$3/month

61% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Google Tag Manager takes 233ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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