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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
56
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.

3.81 s

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

12.43 s

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

205 ms

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

0.000

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

8.56 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.

12.43 s

Page Load Progression

608 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.3 s
4.9 s
Checks
17
7 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
7.8 MB transferred, 39 requests
FIX
7.8 MB transferred, 39 requests
Critical::
Page weighs 8.3 MB (7.8 MB transferred)
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 MB
Info::
39 HTTP requests
Info::
Estimated 1.6 g CO2 per page load
7.8 MB / 2.4 MB budget
7.8 MB transferred
39 requests
1.6 g CO2 per page load
Other 5.8 MiB 75%
Images 1.5 MiB 19%
JavaScript 372.1 KiB 5%
Fonts 52.8 KiB 1%
CSS 25.9 KiB 0%
HTML 15.5 KiB 0%
Other 1.3 KiB 0%
Other 550 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 (7.8 MiB of 7.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
39 resources · 7.8 MB · 148 KB savings available
FIX
39 resources · 7.8 MB · 148 KB savings available
Warning::
Page weight 6.8 MB over 1MB target
Got: 7.8 MB Expected: ≤ 1 MB
Info::
~148 KB of savings available
Warning::
38 third-party resources (100% of weight)
Info::
2 resources over 200KB
39 resources · 7.8 MiB · 38 third-party 6.8 MiB over 1MB target
Media 75% · 5.8 MiB
Image 19% · 1.5 MiB
JavaScript 5% · 372.1 KiB
Font 1% · 52.8 KiB
CSS 0% · 25.9 KiB
Document 0% · 15.9 KiB
Other 0% · 550 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
7 images, 0 KB saveable
REVIEW
7 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.
7 images 1.5 MB
0 oversized -0 KB
7 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

C
JS Execution Cost
Action
1035ms total JS execution
REVIEW
1035ms total JS execution
Warning::
Unattributable: 337ms CPU time
Info::
webpack://Gateway/./wp-content/themes/berkeleygate...: 202ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-JD06...: 180ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PXX...: 145ms CPU time
Info::
https://www.berkeley.edu/: 104ms CPU time
Warning::
Third-party scripts: 1035ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Other 29% Style & Layout 20% Script Parsing & Compilation 9% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable337ms12ms0ms3rd
webpack://Gateway/./wp-content/themes/berkeleygateway/src/js/gateway.js?202ms6ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JD06GX6S4V&cx=c&gtm=4e64f0180ms146ms33ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PXXHBJX145ms101ms41ms3rd
https://www.berkeley.edu/104ms7ms2ms3rd
https://www.berkeley.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.166ms52ms6ms3rd
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 (43%)
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 (43%)✓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+
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.8 s LCP 12.4 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 62 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 — 46 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 — 44 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 — 52 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 62 ms
Start 692 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 2 KB
Load time 46 ms
Start 692 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 1 KB
Load time 44 ms
Start 692 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 2 KB
Load time 52 ms
Start 693 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 resource hints configured

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
Network Waterfall
39 requests over 1557ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.8 s LCP 12.4 shttps://berkeley.edu// https://berkeley.edu/ — 301 — 364 B — 184 ms — h2https://www.berkeley.edu/www.berkeley.edu/ https://www.berkeley.edu/ — 200 — 15.5 KiB — 191 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 — 28 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 — 166 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 — 31 ms — h2https://www.youtube.com/iframe_apiwww.youtube.com/iframe_api https://www.youtube.com/iframe_api — 200 — 3.2 KiB — 189 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 — 974 B — 23 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 — 33 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 — 33 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 — 33 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 — 54 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 — 30 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 — 25 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 — 67 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 — 31 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 — 45 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 — 27 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 — 73 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 — 23 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 — 24 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 — 31 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 — 38 ms — h3https://siteimproveanalytics.com/js/siteanalyze_6294756.jssiteimproveanalytics.com/js/siteana... https://siteimproveanalytics.com/js/siteanalyze_6294756.js — 200 — 9.3 KiB — 89 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 — 48 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 — 264 ms — h2https://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 — 5.8 MiB — 28 ms — h3blob:https://www.berkeley.edu/50e0a686-37a4-468e-8ddf-cafaa0803aadwww.berkeley.edu/50e0a686-37a4-468e... blob:https://www.berkeley.edu/50e0a686-37a4-468e-8ddf-cafaa0803aad — 200 — -1 B — 147 ms — blobhttps://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 — 62 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 — 46 ms — h3https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-regular-400.woff2www.berkeley.edu/wp-content/themes/... https://www.berkeley.edu/wp-content/themes/berkeleygateway/dist/webfonts/fa-regular-400.woff2 — 200 — 1.2 KiB — 44 ms — h3
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.8 s LCP 12.4 shttps://berkeley.edu// https://berkeley.edu/ — 301 — 364 B — 184 ms — h2https://www.berkeley.edu/www.berkeley.edu/ https://www.berkeley.edu/ — 200 — 15.5 KiB — 191 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 — 28 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 — 166 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 — 31 ms — h2https://www.youtube.com/iframe_apiwww.youtube.com/iframe_api https://www.youtube.com/iframe_api — 200 — 3.2 KiB — 189 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 — 974 B — 23 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 — 33 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 — 33 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 — 33 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 — 54 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 — 30 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 — 25 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 1035ms · 318KB · $14/mo
Unattributable
Other
Costly
Execution 337ms
Transfer 0 KB
Monthly Cost $4/mo
Gateway
Other
Costly
Execution 202ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 180ms
Transfer 150 KB
Unused 43%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 145ms
Transfer 122 KB
Unused 53%
Monthly Cost $2/mo
www.berkeley.edu
Other
Optional
Execution 104ms
Transfer 15 KB
Monthly Cost $1/mo
www.berkeley.edu
Other
Optional
Execution 66ms
Transfer 31 KB
Unused 67%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 337ms and costs ~$4/month
  • Gateway adds 202ms and costs ~$3/month

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

Unattributable takes 337ms 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

Gateway takes 202ms 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

53% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

67% of www.berkeley.edu's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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