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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

9.40 s

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

25.61 s

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

915 ms

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

0.068

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

9.40 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.

33.33 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
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
6.1 MB transferred, 111 requests
FIX
6.1 MB transferred, 111 requests
Critical::
Page weighs 11.5 MB (6.1 MB transferred)
Warning::
Images are 4.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.1 MB
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Warning::
111 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.3 g CO2 per page load
6.1 MB / 2.4 MB budget
6.1 MB transferred
111 requests
1.3 g CO2 per page load
Images 4.1 MiB 68%
JavaScript 1.7 MiB 29%
Fonts 158.3 KiB 3%
CSS 19.5 KiB 0%
HTML 15.9 KiB 0%
Other 2.9 KiB 0%
Other 1.4 KiB 0%
Other 556 B 0%
Other 547 B 0%
Other 0 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

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (6.1 MiB of 6.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4059ms total JS execution
FIX
4059ms total JS execution
Warning::
https://cdn.lbl.gov/stable/3/js/lblFullComponents....: 792ms CPU time
Warning::
Unattributable: 676ms CPU time
Warning::
https://www.lbl.gov/: 637ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-9N26...: 330ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M54...: 268ms CPU time
Warning::
Third-party scripts: 4059ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Script Parsing & Compilation 21% Other 20% Style & Layout 14% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://cdn.lbl.gov/stable/3/js/lblFullComponents.js?ver=5.0.2792ms276ms59ms3rd
Unattributable676ms11ms0ms3rd
https://www.lbl.gov/637ms45ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=G-9N26W4812N&cx=c&gtm=4e64h1330ms268ms58ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M544LVV268ms210ms50ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js256ms143ms108ms3rd
https://www.lbl.gov/wp-includes/js/dist/block-editor.min.js?ver=addf558a422e2ee57920194ms90ms104ms3rd
https://www.lbl.gov/wp-includes/js/dist/components.min.js?ver=0d72a218dfea8f6f442f182ms83ms98ms3rd
https://static.ctctcdn.com/js/signup-form-widget/current/signup-form-widget.min.js141ms16ms124ms3rd
https://www.lbl.gov/wp-includes/js/dist/date.min.js?ver=795a56839718d3ff7eae131ms42ms89ms3rd

Showing top 10 of 17 scripts

F
JS Bundles
Action
61 scripts, 1008 KB unused
FIX
61 scripts, 1008 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 242 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lbl.gov/wp-includes/js/dist/block-edit...: 213 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lbl.gov/wp-includes/js/dist/components...: 193 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lbl.gov/wp-includes/js/dist/editor.min...: 96 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M54...: 64 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1008 KB
1008 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB242 KB (67%)✓3rd
https://www.lbl.gov/wp-includes/js/dist/block-editor.min.js?ver=addf558a422e2ee57920258 KB213 KB (83%)✓3rd
https://www.lbl.gov/wp-includes/js/dist/components.min.js?ver=0d72a218dfea8f6f442f241 KB193 KB (80%)✓3rd
https://www.lbl.gov/wp-includes/js/dist/editor.min.js?ver=e94186146898a6d39837115 KB96 KB (84%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M544LVV135 KB64 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-9N26W4812N&cx=c&gtm=4e64h1158 KB64 KB (40%)✓3rd
https://www.lbl.gov/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.142 KB36 KB (87%)✓3rd
https://www.lbl.gov/wp-includes/js/dist/blocks.min.js?ver=57eca4d23daac7159d8854 KB36 KB (67%)✓3rd
https://static.ctctcdn.com/js/signup-form-widget/current/signup-form-widget.min.js37 KB35 KB (95%)✓3rd
https://cdn.lbl.gov/stable/3/js/lblFullComponents.js?ver=5.0.283 KB29 KB (36%)✓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

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

F
Page Weight Inventory
Action
111 resources · 6.1 MB · 1008 KB savings available
FIX
111 resources · 6.1 MB · 1008 KB savings available
Warning::
Page weight 5.1 MB over 1MB target
Got: 6.1 MB Expected: ≤ 1 MB
Info::
~1008 KB of savings available
Warning::
110 third-party resources (100% of weight)
Info::
8 resources over 200KB
111 resources · 6.1 MiB · 110 third-party 5.1 MiB over 1MB target
Image 68% · 4.1 MiB
JavaScript 29% · 1.7 MiB
Font 3% · 158.3 KiB
CSS 0% · 19.5 KiB
Document 0% · 15.9 KiB
Other 0% · 4.1 KiB

~1008.3 KiB of savings available

Remove unused JavaScript: 1008.3 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.

B
Image Optimization
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
Info::
All images are well-optimized
28 images 4.1 MB
0 oversized -0 KB
28 legacy format
0 missing dimensions CLS risk
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
6 fonts (158 KB)
PASS
6 fonts (158 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

158 KB total

Render-blocking

0

of 6

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 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s FCP 9.4 s LCP 25.6 shttps://use.typekit.net/af/9cb78a/0000000000000000000118ad/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/9cb78a/0000000000000000000118ad/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 16.0 KiB — 8 ms — font-display: swaphttps://use.typekit.net/af/b825af/0000000000000000000118b1/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/b825af/0000000000000000000118b1/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 15.4 KiB — 3 ms — font-display: swaphttps://www.lbl.gov/wp-content/themes/lbl-theme/dist/802f7c7bf2678f253bea.woff2802f7c7bf2678f253bea.woff2 https://www.lbl.gov/wp-content/themes/lbl-theme/dist/802f7c7bf2678f253bea.woff2 — 48.1 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/2e6f07/000000000000000000011ce6/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/2e6f07/000000000000000000011ce6/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 15.5 KiB — 4 ms — font-display: swaphttps://www.lbl.gov/wp-content/themes/lbl-theme/dist/d8a7ff3bddc1b6999fe9.woff2d8a7ff3bddc1b6999fe9.woff2 https://www.lbl.gov/wp-content/themes/lbl-theme/dist/d8a7ff3bddc1b6999fe9.woff2 — 48.6 KiB — 14 ms — font-display: swaphttps://use.typekit.net/af/801a74/000000000000000000012126/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3l https://use.typekit.net/af/801a74/000000000000000000012126/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3 — 14.7 KiB — 22 ms — font-display: swap
l woff2 swap
Size 16 KB
Load time 8 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 3 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
802f7c7bf2678f253bea.woff2 woff2 swap
Size 48 KB
Load time 17 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 4 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
d8a7ff3bddc1b6999fe9.woff2 woff2 swap
Size 49 KB
Load time 14 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 22 ms
Start 1.3 s
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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
2
prefetch
—

2 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
111 requests over 2093ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s FCP 9.4 s LCP 25.6 shttps://lbl.gov// https://lbl.gov/ — 301 — 123 B — 360 ms — http/1.0http://www.lbl.gov/www.lbl.gov/ http://www.lbl.gov/ — 307 — 0 B — 2 ms — http/1.1https://www.lbl.gov/www.lbl.gov/ https://www.lbl.gov/ — 200 — 15.9 KiB — 200 ms — h2https://cdn.lbl.gov/stable/3/css/global.css?ver=5.0.2cdn.lbl.gov/stable/3/css/global.css... https://cdn.lbl.gov/stable/3/css/global.css?ver=5.0.2 — 200 — 5.7 KiB — 152 ms — h2https://use.typekit.net/evi6dpc.css?ver=5.0.1use.typekit.net/evi6dpc.css?ver=5.0... https://use.typekit.net/evi6dpc.css?ver=5.0.1 — 200 — 1.4 KiB — 33 ms — h2https://www.lbl.gov/wp-content/themes/lbl-theme/dist/bundle.css?ver=5.0.1www.lbl.gov/wp-content/themes/lbl-t... https://www.lbl.gov/wp-content/themes/lbl-theme/dist/bundle.css?ver=5.0.1 — 200 — 5.1 KiB — 46 ms — h2https://www.lbl.gov/wp-includes/js/dist/vendor/react.min.js?ver=18.3.1.1www.lbl.gov/wp-includes/js/dist/ven... https://www.lbl.gov/wp-includes/js/dist/vendor/react.min.js?ver=18.3.1.1 — 200 — 4.2 KiB — 43 ms — h2https://www.lbl.gov/wp-includes/js/dist/vendor/react-jsx-runtime.min.js?ver=18.3.1www.lbl.gov/wp-includes/js/dist/ven... https://www.lbl.gov/wp-includes/js/dist/vendor/react-jsx-runtime.min.js?ver=18.3.1 — 200 — 697 B — 42 ms — h2https://www.lbl.gov/wp-includes/js/dist/autop.min.js?ver=9fb50649848277dd318dwww.lbl.gov/wp-includes/js/dist/aut... https://www.lbl.gov/wp-includes/js/dist/autop.min.js?ver=9fb50649848277dd318d — 200 — 2.2 KiB — 47 ms — h2https://www.lbl.gov/wp-includes/js/dist/blob.min.js?ver=9113eed771d446f4a556www.lbl.gov/wp-includes/js/dist/blo... https://www.lbl.gov/wp-includes/js/dist/blob.min.js?ver=9113eed771d446f4a556 — 200 — 623 B — 50 ms — h2https://www.lbl.gov/wp-includes/js/dist/block-serialization-default-parser.min.js?ver=14d44daebf663d05d330www.lbl.gov/wp-includes/js/dist/blo... https://www.lbl.gov/wp-includes/js/dist/block-serialization-default-parser.min.js?ver=14d44daebf663d05d330 — 200 — 1.2 KiB — 54 ms — h2https://www.lbl.gov/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1www.lbl.gov/wp-includes/js/dist/hoo... https://www.lbl.gov/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1 — 200 — 2.0 KiB — 47 ms — h2https://www.lbl.gov/wp-includes/js/dist/deprecated.min.js?ver=e1f84915c5e8ae38964cwww.lbl.gov/wp-includes/js/dist/dep... https://www.lbl.gov/wp-includes/js/dist/deprecated.min.js?ver=e1f84915c5e8ae38964c — 200 — 515 B — 54 ms — h2https://www.lbl.gov/wp-includes/js/dist/dom.min.js?ver=26edef3be6483da3de2ewww.lbl.gov/wp-includes/js/dist/dom... https://www.lbl.gov/wp-includes/js/dist/dom.min.js?ver=26edef3be6483da3de2e — 200 — 4.8 KiB — 59 ms — h2https://www.lbl.gov/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1www.lbl.gov/wp-includes/js/dist/ven... https://www.lbl.gov/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.1 — 200 — 41.6 KiB — 83 ms — h2https://www.lbl.gov/wp-includes/js/dist/escape-html.min.js?ver=6561a406d2d232a6fbd2www.lbl.gov/wp-includes/js/dist/esc... https://www.lbl.gov/wp-includes/js/dist/escape-html.min.js?ver=6561a406d2d232a6fbd2 — 200 — 594 B — 55 ms — h2https://www.lbl.gov/wp-includes/js/dist/element.min.js?ver=6a582b0c827fa25df3ddwww.lbl.gov/wp-includes/js/dist/ele... https://www.lbl.gov/wp-includes/js/dist/element.min.js?ver=6a582b0c827fa25df3dd — 200 — 5.1 KiB — 55 ms — h2https://www.lbl.gov/wp-includes/js/dist/is-shallow-equal.min.js?ver=e0f9f1d78d83f5196979www.lbl.gov/wp-includes/js/dist/is-... https://www.lbl.gov/wp-includes/js/dist/is-shallow-equal.min.js?ver=e0f9f1d78d83f5196979 — 200 — 588 B — 59 ms — h2https://www.lbl.gov/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375www.lbl.gov/wp-includes/js/dist/i18... https://www.lbl.gov/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375 — 200 — 2.3 KiB — 62 ms — h2https://www.lbl.gov/wp-includes/js/dist/keycodes.min.js?ver=34c8fb5e7a594a1c8037www.lbl.gov/wp-includes/js/dist/key... https://www.lbl.gov/wp-includes/js/dist/keycodes.min.js?ver=34c8fb5e7a594a1c8037 — 200 — 1.4 KiB — 96 ms — h2https://www.lbl.gov/wp-includes/js/dist/priority-queue.min.js?ver=2d59d091223ee9a33838www.lbl.gov/wp-includes/js/dist/pri... https://www.lbl.gov/wp-includes/js/dist/priority-queue.min.js?ver=2d59d091223ee9a33838 — 200 — 1.6 KiB — 64 ms — h2https://www.lbl.gov/wp-includes/js/dist/compose.min.js?ver=7a9b375d8c19cf9d3d9bwww.lbl.gov/wp-includes/js/dist/com... https://www.lbl.gov/wp-includes/js/dist/compose.min.js?ver=7a9b375d8c19cf9d3d9b — 200 — 12.9 KiB — 66 ms — 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https://8343.global.siteimproveanalytics.io/image.aspx?url=https%3A%2F%2Fwww.lbl.gov%2F&title=Home%20%E2%80%93%20Lawrence%20Berkeley%20National%20Laboratory&res=412x823&accountid=8343&rt=1541&prev=cd7b98ea-a2a2-fab1-1087-1ae1c0951def&luid=b688140a-2888-2832-cdf0-3775c61079cf&dnt=true&rnd=27804 — 200 — 210 B — 37 ms — 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h2https://static.ctctcdn.com/js/signup-form-widget/current/signup-form-widget.cssstatic.ctctcdn.com/js/signup-form-w... https://static.ctctcdn.com/js/signup-form-widget/current/signup-form-widget.css — 200 — 5.7 KiB — 16 ms — h2https://listgrowth.ctctcdn.com/v1/c2872f93945217dd948cf0952dd72e2b.jsonlistgrowth.ctctcdn.com/v1/c2872f939... https://listgrowth.ctctcdn.com/v1/c2872f93945217dd948cf0952dd72e2b.json — 200 — 1.4 KiB — 197 ms — h2https://www.lbl.gov/wp-content/themes/lbl-child-theme-www/favicon.pngwww.lbl.gov/wp-content/themes/lbl-c... https://www.lbl.gov/wp-content/themes/lbl-child-theme-www/favicon.png — 200 — 1.3 KiB — 12 ms — h2
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 4059ms · 1608KB · $54/mo
cdn.lbl.gov
Other
Costly
Execution 792ms
Transfer 83 KB
Unused 36%
Monthly Cost $11/mo
Unattributable
Other
Costly
Execution 676ms
Transfer 0 KB
Monthly Cost $9/mo
www.lbl.gov
Other
Costly
Execution 637ms
Transfer 16 KB
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 330ms
Transfer 158 KB
Unused 40%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 268ms
Transfer 135 KB
Unused 47%
Monthly Cost $4/mo
www.gstatic.com
Other
Costly
Execution 256ms
Transfer 362 KB
Unused 67%
Monthly Cost $3/mo
www.lbl.gov
Other
Optional
Execution 194ms
Transfer 258 KB
Unused 83%
Monthly Cost $3/mo
www.lbl.gov
Other
Optional
Execution 182ms
Transfer 241 KB
Unused 80%
Monthly Cost $2/mo
static.ctctcdn.com
Other
Optional
Execution 141ms
Transfer 37 KB
Unused 95%
Monthly Cost $2/mo
www.lbl.gov
Other
Optional
Execution 131ms
Transfer 41 KB
Monthly Cost $2/mo
www.lbl.gov
Other
Optional
Execution 80ms
Transfer 115 KB
Unused 84%
Monthly Cost $1/mo
siteimproveanalytics.com
Other
Optional
Execution 77ms
Transfer 41 KB
Monthly Cost $1/mo
cdnjs
CDN
Optional
Execution 73ms
Transfer 27 KB
Monthly Cost $1/mo
cdn.lbl.gov
Other
Optional
Execution 65ms
Transfer 16 KB
Monthly Cost $1/mo
www.lbl.gov
Other
Optional
Execution 53ms
Transfer 1 KB
Monthly Cost $1/mo
www.lbl.gov
Other
Optional
Execution 52ms
Transfer 54 KB
Unused 67%
Monthly Cost $1/mo
www.lbl.gov
Other
Optional
Execution 51ms
Transfer 21 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • cdn.lbl.gov adds 792ms and costs ~$11/month
  • Unattributable adds 676ms and costs ~$9/month
  • www.lbl.gov adds 637ms and costs ~$8/month
  • Google Tag Manager adds 330ms and costs ~$4/month
  • Google Tag Manager adds 268ms and costs ~$4/month
  • www.gstatic.com adds 256ms 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

cdn.lbl.gov takes 792ms 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

Unattributable takes 676ms 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

www.lbl.gov takes 637ms 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

Google Tag Manager takes 330ms 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

Google Tag Manager takes 268ms 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

www.gstatic.com takes 256ms 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

67% of www.gstatic.com'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

83% of www.lbl.gov'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

80% of www.lbl.gov'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

95% of static.ctctcdn.com'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

84% of www.lbl.gov'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.lbl.gov'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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