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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
76
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.18 s

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

2.06 s

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

42 ms

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

0.205

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

1.65 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.

3.89 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
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.3 MB transferred, 130 requests
FIX
3.3 MB transferred, 130 requests
Warning::
Page weighs 9.3 MB (3.3 MB transferred)
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Warning::
130 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.69 g CO2 per page load
3.3 MB / 2.4 MB budget
3.3 MB transferred
130 requests
0.69 g CO2 per page load
JavaScript 1.6 MiB 50%
Images 1.1 MiB 34%
HTML 274.1 KiB 8%
Other 112.7 KiB 3%
Fonts 68.9 KiB 2%
CSS 64.3 KiB 2%
Other 17.6 KiB 1%
Other 10.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (3.3 MiB of 3.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
60 scripts, 649 KB unused
FIX
60 scripts, 649 KB unused
Warning::
https://vanilla.futurecdn.net/livescience/1610431/...: 85 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WHL...: 83 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KD4...: 70 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://search-api.fie.futurecdn.net/js/w/es6/mast...: 67 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7ZGF...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 649 KB
649 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://vanilla.futurecdn.net/livescience/1610431/media/shared/js/bundle.connect.js139 KB85 KB (62%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHLXGS3C&gtm=4e64h1166 KB83 KB (50%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KD4PJ8SL&gtm=4e64h1112 KB70 KB (63%)✓3rd
https://search-api.fie.futurecdn.net/js/w/es6/master-f8e9977d/responsive.js142 KB67 KB (62%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7ZGF1642HL&cx=c&gtm=4e64h1146 KB60 KB (41%)✓3rd
https://bordeaux.futurecdn.net/bordeaux.js159 KB54 KB (57%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WWBWRXL144 KB47 KB (33%)✓3rd
https://vanilla.futurecdn.net/livescience/1610431/media/shared/js/main.DcB9tpsv.bundle.js105 KB44 KB (42%)✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js0 KB35 KB (65%)✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js54 KB35 KB (65%)✓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
130 resources · 3.3 MB · 649 KB savings available
FIX
130 resources · 3.3 MB · 649 KB savings available
Warning::
Page weight 2.3 MB over 1MB target
Got: 3.3 MB Expected: ≤ 1 MB
Info::
~649 KB of savings available
Warning::
129 third-party resources (100% of weight)
Info::
2 resources over 200KB
130 resources · 3.3 MiB · 129 third-party 2.3 MiB over 1MB target
JavaScript 52% · 1.7 MiB
Image 34% · 1.1 MiB
Document 8% · 275.1 KiB
Font 2% · 68.9 KiB
CSS 2% · 64.3 KiB
Other 1% · 43.9 KiB

~648.8 KiB of savings available

Remove unused JavaScript: 648.8 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store,private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store,private

DirectiveValueMeaning
no-store—Never cache this response
private—Only browser cache, not CDN/proxy
B
Image Optimization
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Info::
All images are well-optimized
35 images 1.1 MB
0 oversized -0 KB
17 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1834ms total JS execution
REVIEW
1834ms total JS execution
Warning::
https://www.livescience.com/: 747ms CPU time
Warning::
Unattributable: 441ms CPU time
Info::
https://cdn.privacy-mgmt.com/unified/4.40.1/usnat-...: 118ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WHL...: 100ms CPU time
Info::
https://bordeaux.futurecdn.net/bordeaux.js: 96ms CPU time
Warning::
Third-party scripts: 1834ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 26% Style & Layout 12% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.livescience.com/747ms144ms25ms3rd
Unattributable441ms128ms0ms3rd
https://cdn.privacy-mgmt.com/unified/4.40.1/usnat-uspapi.090eccada574d39af6f8.bundle.js118ms100ms8ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHLXGS3C&gtm=4e64h1100ms88ms12ms3rd
https://bordeaux.futurecdn.net/bordeaux.js96ms77ms14ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WWBWRXL95ms83ms11ms3rd
https://cdn.viafoura.net/entry/index.js68ms42ms1ms3rd
https://vanilla.futurecdn.net/livescience/1610431/media/shared/js/main.DcB9tpsv.bundle.js62ms49ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7ZGF1642HL&cx=c&gtm=4e64h153ms45ms8ms3rd
https://vanilla.futurecdn.net/livescience/1610431/media/shared/js/bundle.connect.js52ms39ms13ms3rd
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 (69 KB)
PASS
4 fonts (69 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

69 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 FCP 1.2 s LCP 2.1 shttps://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2OpenSans-400-Regular.woff2 https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2 — 20.6 KiB — 54 ms — font-display: swaphttps://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2OpenSans-600-SemiBold.w... https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2 — 20.7 KiB — 53 ms — font-display: swaphttps://vanilla.futurecdn.net/livescience/1610431/media/fonts/livescience.wofflivescience.woff https://vanilla.futurecdn.net/livescience/1610431/media/fonts/livescience.woff — 7.5 KiB — 8 ms — font-display: swaphttps://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-700-Bold.woff2OpenSans-700-Bold.woff2 https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-700-Bold.woff2 — 20.2 KiB — 9 ms — font-display: swap
OpenSans-400-Regular.woff2 woff2 swap
Size 21 KB
Load time 54 ms
Start 28 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-600-SemiBold.w... woff2 swap
Size 21 KB
Load time 53 ms
Start 29 ms
Risk FOUT — text flashes from fallback to web font
livescience.woff woff swap
Size 7 KB
Load time 8 ms
Start 289 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-700-Bold.woff2 woff2 swap
Size 20 KB
Load time 9 ms
Start 289 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)

Fixing the unchecked items could save ~2 KB and ~4 ms

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
130 requests over 31450ms
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 28.0 s 30.0 s 32.0 s FCP 1.2 s LCP 2.1 shttps://livescience.com// https://livescience.com/ — 301 — 269 B — 6 ms — h2https://www.livescience.com/www.livescience.com/ https://www.livescience.com/ — 200 — 271.8 KiB — 13 ms — h2https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2vanilla.futurecdn.net/livescience/1... https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2 — 200 — 20.6 KiB — 54 ms — h3https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2vanilla.futurecdn.net/livescience/1... https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2 — 200 — 20.7 KiB — 53 ms — h3https://vanilla.futurecdn.net/livescience/1610431/media/css/livescience.min.cssvanilla.futurecdn.net/livescience/1... https://vanilla.futurecdn.net/livescience/1610431/media/css/livescience.min.css — 200 — 47.1 KiB — 53 ms — h3https://www.livescience.com/vite/assets/reduxStore-Cn5mFc99.jswww.livescience.com/vite/assets/red... https://www.livescience.com/vite/assets/reduxStore-Cn5mFc99.js — 200 — 4.4 KiB — 19 ms — h2https://www.livescience.com/vite/assets/main-Cm0XM4Nt.jswww.livescience.com/vite/assets/mai... https://www.livescience.com/vite/assets/main-Cm0XM4Nt.js — 200 — 2.9 KiB — 13 ms — h2https://www.livescience.com/vite/assets/Flexi/Widgets/Carouzelize.ts-BQCnpvGa.jswww.livescience.com/vite/assets/Fle... https://www.livescience.com/vite/assets/Flexi/Widgets/Carouzelize.ts-BQCnpvGa.js — 200 — 1.4 KiB — 20 ms — h2https://www.livescience.com/vite/assets/Ads/Ads.ts-CCQdtPIk.jswww.livescience.com/vite/assets/Ads... https://www.livescience.com/vite/assets/Ads/Ads.ts-CCQdtPIk.js — 200 — 642 B — 11 ms — h2https://www.livescience.com/vite/assets/Viafoura/EntryScript/EntryScript.ts-ozopKOza.jswww.livescience.com/vite/assets/Via... https://www.livescience.com/vite/assets/Viafoura/EntryScript/EntryScript.ts-ozopKOza.js — 200 — 902 B — 18 ms — h2https://www.livescience.com/vite/assets/Footer/ccpa-footer-link.ts-B9_pzN11.jswww.livescience.com/vite/assets/Foo... https://www.livescience.com/vite/assets/Footer/ccpa-footer-link.ts-B9_pzN11.js — 200 — 923 B — 9 ms — h2https://www.livescience.com/vite/assets/Footer/gdpr-footer-link.ts-BYKQRecd.jswww.livescience.com/vite/assets/Foo... https://www.livescience.com/vite/assets/Footer/gdpr-footer-link.ts-BYKQRecd.js — 200 — 1.0 KiB — 14 ms — h2https://search-api.fie.futurecdn.net/css/browser/master-f8e9977d/responsive.min.csssearch-api.fie.futurecdn.net/css/br... https://search-api.fie.futurecdn.net/css/browser/master-f8e9977d/responsive.min.css — 200 — 10.6 KiB — 45 ms — h2https://cdn.mos.cms.futurecdn.net/flexiimages/mqlcl6p9ca1767779103.jpgcdn.mos.cms.futurecdn.net/flexiimag... https://cdn.mos.cms.futurecdn.net/flexiimages/mqlcl6p9ca1767779103.jpg — 200 — 574.0 KiB — 60 ms — h3https://cdn.mos.cms.futurecdn.net/flexiimages/9g8bisxmnt1764585116.pngcdn.mos.cms.futurecdn.net/flexiimag... https://cdn.mos.cms.futurecdn.net/flexiimages/9g8bisxmnt1764585116.png — 200 — 4.3 KiB — 45 ms — h3https://www.livescience.com/media/img/ls-logo-w.svgwww.livescience.com/media/img/ls-lo... https://www.livescience.com/media/img/ls-logo-w.svg — 200 — 1.3 KiB — 11 ms — h2https://search-api.fie.futurecdn.net/js/w/es6/master-f8e9977d/hawklinks.jssearch-api.fie.futurecdn.net/js/w/e... https://search-api.fie.futurecdn.net/js/w/es6/master-f8e9977d/hawklinks.js — 200 — 39.1 KiB — 55 ms — h2https://cdn.mos.cms.futurecdn.net/flexiimages/6gtg42flht1767779175.svgcdn.mos.cms.futurecdn.net/flexiimag... https://cdn.mos.cms.futurecdn.net/flexiimages/6gtg42flht1767779175.svg — 200 — 2.5 KiB — 5 ms — h3https://cdn.mos.cms.futurecdn.net/flexiimages/kd4wux0r8f1767779188.svgcdn.mos.cms.futurecdn.net/flexiimag... https://cdn.mos.cms.futurecdn.net/flexiimages/kd4wux0r8f1767779188.svg — 200 — 2.4 KiB — 6 ms — h3https://cdn.mos.cms.futurecdn.net/WntAEWYUaXJwBEAXaa9JnN-650-80.jpg.webpcdn.mos.cms.futurecdn.net/WntAEWYUa... https://cdn.mos.cms.futurecdn.net/WntAEWYUaXJwBEAXaa9JnN-650-80.jpg.webp — 200 — 16.2 KiB — 6 ms — h3https://cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.jscdn.privacy-mgmt.com/unified/wrappe... https://cdn.privacy-mgmt.com/unified/wrapperMessagingWithoutDetection.js — 200 — 42.0 KiB — 131 ms — h2https://freyr.futurecdn.net/freyr.jsfreyr.futurecdn.net/freyr.js https://freyr.futurecdn.net/freyr.js — 200 — 22.3 KiB — 146 ms — h2https://www.livescience.com/vite/assets/Ads/Bordeaux/Controllers/BordeauxController.ts-BGgoKI6y.jswww.livescience.com/vite/assets/Ads... https://www.livescience.com/vite/assets/Ads/Bordeaux/Controllers/BordeauxController.ts-BGgoKI6y.js — 200 — 1.6 KiB — 19 ms — h3https://www.livescience.com/vite/assets/Ads/Bordeaux/Services/Kiosq.ts-AAMjXMsn.jswww.livescience.com/vite/assets/Ads... https://www.livescience.com/vite/assets/Ads/Bordeaux/Services/Kiosq.ts-AAMjXMsn.js — 200 — 1.5 KiB — 18 ms — h3https://www.livescience.com/vite/assets/vendor-DH-HcC7C.jswww.livescience.com/vite/assets/ven... https://www.livescience.com/vite/assets/vendor-DH-HcC7C.js — 200 — 41.2 KiB — 98 ms — h3https://www.livescience.com/vite/assets/Nav/Nav.ts-agSe9QHG.jswww.livescience.com/vite/assets/Nav... https://www.livescience.com/vite/assets/Nav/Nav.ts-agSe9QHG.js — 200 — 2.5 KiB — 83 ms — h3https://www.livescience.com/vite/assets/cookies-Btke1V1y.jswww.livescience.com/vite/assets/coo... https://www.livescience.com/vite/assets/cookies-Btke1V1y.js — 200 — 1.0 KiB — 83 ms — h3https://www.livescience.com/vite/assets/lazy-iframe-DxRpt_oy.jswww.livescience.com/vite/assets/laz... https://www.livescience.com/vite/assets/lazy-iframe-DxRpt_oy.js — 200 — 1.0 KiB — 83 ms — h3https://www.livescience.com/vite/assets/MyAccount/Badges/index.ts-Bvthoehy.jswww.livescience.com/vite/assets/MyA... https://www.livescience.com/vite/assets/MyAccount/Badges/index.ts-Bvthoehy.js — 200 — 952 B — 83 ms — h3https://www.livescience.com/vite/assets/observeStore-BFjnUjC2.jswww.livescience.com/vite/assets/obs... https://www.livescience.com/vite/assets/observeStore-BFjnUjC2.js — 200 — 923 B — 82 ms — h3
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 28.0 s 30.0 s 32.0 s FCP 1.2 s LCP 2.1 shttps://livescience.com// https://livescience.com/ — 301 — 269 B — 6 ms — h2https://www.livescience.com/www.livescience.com/ https://www.livescience.com/ — 200 — 271.8 KiB — 13 ms — h2https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2vanilla.futurecdn.net/livescience/1... https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2 — 200 — 20.6 KiB — 54 ms — h3https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2vanilla.futurecdn.net/livescience/1... https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2 — 200 — 20.7 KiB — 53 ms — h3https://vanilla.futurecdn.net/livescience/1610431/media/css/livescience.min.cssvanilla.futurecdn.net/livescience/1... 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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 1834ms · 1179KB · €20/mo
www.livescience.com
Other
Costly
Execution 747ms
Transfer 272 KB
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 441ms
Transfer 0 KB
Monthly Cost €5/mo
cdn.privacy-mgmt.com
Other
Optional
Execution 118ms
Transfer 34 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 100ms
Transfer 166 KB
Unused 50%
Monthly Cost €1/mo
bordeaux.futurecdn.net
Other
Optional
Execution 96ms
Transfer 159 KB
Unused 57%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 95ms
Transfer 144 KB
Unused 33%
Monthly Cost €1/mo
cdn.viafoura.net
Other
Optional
Execution 68ms
Transfer 16 KB
Monthly Cost €1/mo
vanilla.futurecdn.net
Other
Optional
Execution 62ms
Transfer 105 KB
Unused 42%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 146 KB
Unused 41%
Monthly Cost €1/mo
vanilla.futurecdn.net
Other
Optional
Execution 52ms
Transfer 139 KB
Unused 62%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.livescience.com adds 747ms and costs ~€8/month
  • Unattributable adds 441ms and costs ~€5/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

www.livescience.com takes 747ms 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 441ms 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

50% 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

57% of bordeaux.futurecdn.net'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

62% of vanilla.futurecdn.net'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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