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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
69
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
92
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.

1.08 s

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

2.51 s

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

0 ms

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

0.304

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

1.09 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.

2.53 s

Page Load Progression

434 ms
867 ms
1.3 s
1.7 s
2.2 s
2.6 s
3.0 s
3.5 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
8.6 MB transferred, 46 requests
FIX
8.6 MB transferred, 46 requests
Critical::
Page weighs 9.3 MB (8.6 MB transferred)
Warning::
Images are 2.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.7 MB
Info::
46 HTTP requests
Info::
Estimated 1.8 g CO2 per page load
8.6 MB / 2.4 MB budget
8.6 MB transferred
46 requests
1.8 g CO2 per page load
Other 5.5 MiB 64%
Images 2.7 MiB 31%
JavaScript 372.1 KiB 4%
Fonts 52.8 KiB 1%
CSS 25.9 KiB 0%
HTML 15.5 KiB 0%
Other 1.3 KiB 0%
Other 551 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (8.6 MiB of 8.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
46 resources · 8.6 MB · 148 KB savings available
FIX
46 resources · 8.6 MB · 148 KB savings available
Warning::
Page weight 7.6 MB over 1MB target
Got: 8.6 MB Expected: ≤ 1 MB
Info::
~148 KB of savings available
Warning::
45 third-party resources (100% of weight)
Info::
3 resources over 200KB
46 resources · 8.6 MiB · 45 third-party 7.6 MiB over 1MB target
Media 64% · 5.5 MiB
Image 31% · 2.7 MiB
JavaScript 4% · 372.1 KiB
Font 1% · 52.8 KiB
CSS 0% · 25.9 KiB
Document 0% · 15.8 KiB
Other 0% · 551 B

~148.1 KiB of savings available

Remove unused JavaScript: 148.1 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://www.berkeley.edu/wp-content/themes/berkele... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.berkeley.edu/wp-content/themes/berkele... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 2.7 MB
0 oversized -0 KB
14 legacy format
2 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

B
JS Bundles
20 scripts, 148 KB unused
REVIEW
20 scripts, 148 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PXX...: 64 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JD06...: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.berkeley.edu/wp-includes/js/jquery/jqu...: 21 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 148 KB
148 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PXXHBJX122 KB64 KB (53%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JD06GX6S4V&cx=c&gtm=4e64f0150 KB64 KB (42%)✓3rd
https://www.berkeley.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.131 KB21 KB (67%)✓3rd
https://www.berkeley.edu/wp-includes/js/jquery/ui/core.min.js?ver=1.13.37 KB—✓3rd
https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/theme.min.js?ver=2.1.03 KB—✓3rd
https://www.berkeley.edu/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed3667933752 KB—✓3rd
https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/swv/js/index.js?ver=6.1.54 KB—✓3rd
https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/js/index.js?ver=6.1.54 KB—✓3rd
https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/photogrid.min.js2 KB—✓3rd
https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/videoplaylist.min.js2 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

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+
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+
JS Execution Cost
257ms total JS execution
PASS
257ms total JS execution
Info::
https://www.berkeley.edu/: 167ms CPU time
Info::
Unattributable: 90ms CPU time
Warning::
Third-party scripts: 257ms (100% of total)

Main Thread Breakdown

Other 41% Script Evaluation 28% Style & Layout 19% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.berkeley.edu/167ms2ms0ms3rd
Unattributable90ms3ms0ms3rd
A+
Font Loading
4 fonts (53 KB)
PASS
4 fonts (53 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

53 KB total

Render-blocking

0

of 4

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 1.1 s LCP 2.5 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 91 ms — font-display: swaphttps://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-solid-900.woff2 — 2.4 KiB — 18 ms — font-display: swaphttps://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-brands-400.woff2 — 1.8 KiB — 33 ms — font-display: swaphttps://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-regular-400.woff2 — 1.2 KiB — 30 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 91 ms
Start 678 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 2 KB
Load time 18 ms
Start 678 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 2 KB
Load time 33 ms
Start 742 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 1 KB
Load time 30 ms
Start 743 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
46 requests over 1186ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.1 s LCP 2.5 shttps://berkeley.edu// https://berkeley.edu/ — 301 — 368 B — 186 ms — h2https://www.berkeley.edu/www.berkeley.edu/ https://www.berkeley.edu/ — 200 — 15.5 KiB — 205 ms — h2https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/css/styles.css?ver=6.1.5www.berkeley.edu/wp-content/plugins... https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/css/styles.css?ver=6.1.5 — 200 — 1.1 KiB — 52 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@300..900&family=Source+Serif+4:ital,opsz,wght@0,8..60,200..900;1,8..60,400..700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@300..900&family=Source+Serif+4:ital,opsz,wght@0,8..60,200..900;1,8..60,400..700&display=swap — 200 — 1.3 KiB — 246 ms — h2https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/css/styles.min.css?ver=1775497260www.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/css/styles.min.css?ver=1775497260 — 200 — 23.6 KiB — 80 ms — h2https://www.youtube.com/iframe_apiwww.youtube.com/iframe_api https://www.youtube.com/iframe_api — 200 — 3.2 KiB — 164 ms — h2https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/js.cookie.min.js?ver=3.0.5www.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/js.cookie.min.js?ver=3.0.5 — 200 — 931 B — 58 ms — h2https://www.berkeley.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.berkeley.edu/wp-includes/js/jqu... https://www.berkeley.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 30.9 KiB — 51 ms — h2https://www.berkeley.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1www.berkeley.edu/wp-includes/js/jqu... https://www.berkeley.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.0 KiB — 121 ms — h2https://www.berkeley.edu/wp-content/themes/berkeleygateway/img/logo-berkeley.svg?v=3www.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/img/logo-berkeley.svg?v=3 — 200 — 2.4 KiB — 56 ms — h2https://www.berkeley.edu/wp-content/uploads/2025/06/231011UCB2153-scaled-1.jpgwww.berkeley.edu/wp-content/uploads... https://www.berkeley.edu/wp-content/uploads/2025/06/231011UCB2153-scaled-1.jpg — 200 — 1.3 MiB — 112 ms — h2https://www.berkeley.edu/wp-content/themes/berkeleygateway/img/logo-berkeley-gold.svg?v=3www.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/img/logo-berkeley-gold.svg?v=3 — 200 — 2.6 KiB — 23 ms — h3https://www.berkeley.edu/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1www.berkeley.edu/wp-includes/js/dis... https://www.berkeley.edu/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1 — 200 — 2.2 KiB — 30 ms — h3https://www.berkeley.edu/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375www.berkeley.edu/wp-includes/js/dis... https://www.berkeley.edu/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375 — 200 — 2.5 KiB — 23 ms — h3https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/swv/js/index.js?ver=6.1.5www.berkeley.edu/wp-content/plugins... https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/swv/js/index.js?ver=6.1.5 — 200 — 3.8 KiB — 26 ms — h3https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/js/index.js?ver=6.1.5www.berkeley.edu/wp-content/plugins... https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/js/index.js?ver=6.1.5 — 200 — 4.5 KiB — 21 ms — h3https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/photogrid.min.jswww.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/photogrid.min.js — 200 — 2.0 KiB — 22 ms — h3https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/videoplaylist.min.jswww.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/videoplaylist.min.js — 200 — 1.6 KiB — 74 ms — h3https://www.berkeley.edu/wp-includes/js/jquery/ui/core.min.js?ver=1.13.3www.berkeley.edu/wp-includes/js/jqu... https://www.berkeley.edu/wp-includes/js/jquery/ui/core.min.js?ver=1.13.3 — 200 — 7.4 KiB — 26 ms — h3https://www.berkeley.edu/wp-includes/js/jquery/ui/tooltip.min.js?ver=1.13.3www.berkeley.edu/wp-includes/js/jqu... https://www.berkeley.edu/wp-includes/js/jquery/ui/tooltip.min.js?ver=1.13.3 — 200 — 2.5 KiB — 26 ms — h3https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/theme.min.js?ver=2.1.0www.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/theme.min.js?ver=2.1.0 — 200 — 3.4 KiB — 25 ms — h3https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/gateway.min.jswww.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/gateway.min.js — 200 — 5.0 KiB — 33 ms — h3https://siteimproveanalytics.com/js/siteanalyze_6294756.jssiteimproveanalytics.com/js/siteana... https://siteimproveanalytics.com/js/siteanalyze_6294756.js — 200 — 9.3 KiB — 53 ms — h3https://www.youtube.com/s/player/b174a5bb/www-widgetapi.vflset/www-widgetapi.jswww.youtube.com/s/player/b174a5bb/w... https://www.youtube.com/s/player/b174a5bb/www-widgetapi.vflset/www-widgetapi.js — 200 — 10.6 KiB — 44 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PXXHBJXwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PXXHBJX — 200 — 122.0 KiB — 236 ms — h2https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2fonts.gstatic.com/s/inter/v20/UcC73... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 200 — 47.3 KiB — 91 ms — h3https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-solid-900.woff2www.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-solid-900.woff2 — 200 — 2.4 KiB — 18 ms — h3https://www.berkeley.edu/wp-content/uploads/2025/06/Research-Banner-v3.mp4www.berkeley.edu/wp-content/uploads... https://www.berkeley.edu/wp-content/uploads/2025/06/Research-Banner-v3.mp4 — 206 — 5.5 MiB — 31 ms — h3https://www.berkeley.edu/wp-content/uploads/2025/06/afo_235b-scaled-1-1536x1022.jpgwww.berkeley.edu/wp-content/uploads... https://www.berkeley.edu/wp-content/uploads/2025/06/afo_235b-scaled-1-1536x1022.jpg — 200 — 180.4 KiB — 94 ms — h3https://www.berkeley.edu/wp-content/uploads/2025/06/83A5230-scaled-1-1536x1024.jpgwww.berkeley.edu/wp-content/uploads... https://www.berkeley.edu/wp-content/uploads/2025/06/83A5230-scaled-1-1536x1024.jpg — 200 — 177.2 KiB — 57 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.1 s LCP 2.5 shttps://berkeley.edu// https://berkeley.edu/ — 301 — 368 B — 186 ms — h2https://www.berkeley.edu/www.berkeley.edu/ https://www.berkeley.edu/ — 200 — 15.5 KiB — 205 ms — h2https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/css/styles.css?ver=6.1.5www.berkeley.edu/wp-content/plugins... https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/css/styles.css?ver=6.1.5 — 200 — 1.1 KiB — 52 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@300..900&family=Source+Serif+4:ital,opsz,wght@0,8..60,200..900;1,8..60,400..700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@300..900&family=Source+Serif+4:ital,opsz,wght@0,8..60,200..900;1,8..60,400..700&display=swap — 200 — 1.3 KiB — 246 ms — h2https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/css/styles.min.css?ver=1775497260www.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/css/styles.min.css?ver=1775497260 — 200 — 23.6 KiB — 80 ms — h2https://www.youtube.com/iframe_apiwww.youtube.com/iframe_api https://www.youtube.com/iframe_api — 200 — 3.2 KiB — 164 ms — h2https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/js.cookie.min.js?ver=3.0.5www.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/js.cookie.min.js?ver=3.0.5 — 200 — 931 B — 58 ms — h2https://www.berkeley.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.berkeley.edu/wp-includes/js/jqu... https://www.berkeley.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 30.9 KiB — 51 ms — h2https://www.berkeley.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1www.berkeley.edu/wp-includes/js/jqu... https://www.berkeley.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.0 KiB — 121 ms — 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h3https://www.berkeley.edu/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375www.berkeley.edu/wp-includes/js/dis... https://www.berkeley.edu/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375 — 200 — 2.5 KiB — 23 ms — h3https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/swv/js/index.js?ver=6.1.5www.berkeley.edu/wp-content/plugins... https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/swv/js/index.js?ver=6.1.5 — 200 — 3.8 KiB — 26 ms — h3https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/js/index.js?ver=6.1.5www.berkeley.edu/wp-content/plugins... https://www.berkeley.edu/wp-content/plugins/contact-form-7/includes/js/index.js?ver=6.1.5 — 200 — 4.5 KiB — 21 ms — h3https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/photogrid.min.jswww.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/js/photogrid.min.js — 200 — 2.0 KiB — 22 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
100% of JavaScript execution is third-party
First-party Third-party 257ms · 15KB · $3/mo
www.berkeley.edu
Other
Optional
Execution 167ms
Transfer 15 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 90ms
Transfer 0 KB
Monthly Cost $1/mo

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

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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