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https://hubblesite.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.

964 ms

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

30.64 s

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

157 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.

1.59 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.

30.68 s

Page Load Progression

548 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.3 s
3.8 s
4.4 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
36.9 MB transferred, 119 requests
FIX
36.9 MB transferred, 119 requests
Critical::
Page weighs 45.9 MB (36.9 MB transferred)
Warning::
Images are 33.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 33.1 MB
Warning::
JavaScript is 3.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.0 MB
Info::
Fonts are 271 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 271 KB
Warning::
119 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 7.7 g CO2 per page load
36.9 MB / 2.4 MB budget
36.9 MB transferred
119 requests
7.7 g CO2 per page load
Images 33.1 MiB 90%
JavaScript 3.0 MiB 8%
Fonts 270.8 KiB 1%
CSS 189.4 KiB 1%
Other 171.1 KiB 0%
HTML 158.3 KiB 0%
Other 2.1 KiB 0%
Other 1.7 KiB 0%
Other 1.2 KiB 0%
Other 666 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (36.9 MiB of 36.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
56 scripts, 713 KB unused
FIX
56 scripts, 713 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.googletagmanager.com/gtag/js?id=G-CSLL...: 106 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-542...: 69 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-3MLX...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-82GW...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 713 KB
713 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.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k1147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-542RDH52111 KB69 KB (62%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-3MLXXCVWWY&cx=c&gtm=4e64k1157 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-82GWVTTXCZ&cx=c&gtm=4e64k1159 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLJ258M131 KB63 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://science.nasa.gov/wp-includes/js/dist/vendor/react-dom.min.js?ver=18.3.1.142 KB36 KB (87%)✓3rd
https://science.nasa.gov/wp-content/plugins/accessibility-checker/build/frontendFixes.bundle.js?ver=1.36.03 KB—✓3rd
https://science.nasa.gov/wp-content/plugins/gravityforms/js/jquery.textareaCounter.plugin.min.js?ver=2.9.271 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

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
119 resources · 36.9 MB · 713 KB savings available
FIX
119 resources · 36.9 MB · 713 KB savings available
Warning::
Page weight 35.9 MB over 1MB target
Got: 36.9 MB Expected: ≤ 1 MB
Info::
~713 KB of savings available
Warning::
118 third-party resources (100% of weight)
Info::
6 resources over 200KB
119 resources · 36.9 MiB · 118 third-party 35.9 MiB over 1MB target
Image 90% · 33.1 MiB
JavaScript 8% · 3.0 MiB
Font 1% · 270.8 KiB
CSS 1% · 189.4 KiB
Media 0% · 171.1 KiB
Document 0% · 158.4 KiB
Other 0% · 2.9 KiB

~712.9 KiB of savings available

Remove unused JavaScript: 712.9 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
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 33.1 MB
0 oversized -0 KB
12 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1699ms total JS execution
REVIEW
1699ms total JS execution
Warning::
https://science.nasa.gov/mission/hubble/: 616ms CPU time
Warning::
Unattributable: 324ms CPU time
Info::
https://science.nasa.gov/wp-includes/js/jquery/jqu...: 191ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 149ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-3MLX...: 100ms CPU time
Warning::
Third-party scripts: 1699ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Other 28% Style & Layout 18% Script Parsing & Compilation 10% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://science.nasa.gov/mission/hubble/616ms18ms4ms3rd
Unattributable324ms2ms0ms3rd
https://science.nasa.gov/wp-includes/js/jquery/jquery.min.js?ver=3.7.1191ms113ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L149ms121ms27ms3rd
https://www.googletagmanager.com/gtag/js?id=G-3MLXXCVWWY&cx=c&gtm=4e64k1100ms74ms26ms3rd
https://www.googletagmanager.com/gtag/js?id=G-82GWVTTXCZ&cx=c&gtm=4e64k195ms77ms18ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLJ258M79ms54ms23ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js74ms42ms32ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-542RDH5270ms59ms10ms3rd
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
9 fonts (271 KB)
PASS
9 fonts (271 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

271 KB total

Render-blocking

0

of 9

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 28.0 s 30.0 s 32.0 s FCP 964 ms LCP 30.6 shttps://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Regular.woff2PublicSans-Regular.woff2 https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Regular.woff2 — 32.1 KiB — 22 ms — font-display: swaphttps://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7.woff2UcC73FwrK3iLTeHuS_fvQtM... https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7.woff2 — 37.4 KiB — 26 ms — font-display: swaphttps://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/db-mono/aFTU7PB1QTsUX8KYthqQBA.woff2aFTU7PB1QTsUX8KYthqQBA.... https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/db-mono/aFTU7PB1QTsUX8KYthqQBA.woff2 — 14.4 KiB — 29 ms — font-display: swaphttps://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiA.woff2UcCO3FwrK3iLTeHuS_fvQtM... https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiA.woff2 — 16.6 KiB — 5 ms — font-display: swaphttps://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Bold.woff2PublicSans-Bold.woff2 https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Bold.woff2 — 32.0 KiB — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 35 ms — font-display: swaphttps://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Italic.woff2PublicSans-Italic.woff2 https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Italic.woff2 — 32.6 KiB — 60 ms — font-display: swaphttps://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-BoldItalic.woff2PublicSans-BoldItalic.w... https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-BoldItalic.woff2 — 32.8 KiB — 62 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 39.2 KiB — 14 ms — font-display: swap
PublicSans-Regular.woff2 woff2 swap
Size 32 KB
Load time 22 ms
Start 100 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_fvQtM... woff2 swap
Size 37 KB
Load time 26 ms
Start 100 ms
Risk FOUT — text flashes from fallback to web font
aFTU7PB1QTsUX8KYthqQBA.... woff2 swap
Size 14 KB
Load time 29 ms
Start 101 ms
Risk FOUT — text flashes from fallback to web font
UcCO3FwrK3iLTeHuS_fvQtM... woff2 swap
Size 17 KB
Load time 5 ms
Start 295 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 32 KB
Load time 13 ms
Start 430 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 35 ms
Start 479 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Italic.woff2 woff2 swap
Size 33 KB
Load time 60 ms
Start 533 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-BoldItalic.w... woff2 swap
Size 33 KB
Load time 62 ms
Start 533 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 39 KB
Load time 14 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
119 requests over 2487ms
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 964 ms LCP 30.6 shttps://hubblesite.org// https://hubblesite.org/ — 301 — 121 B — 70 ms — h2https://science.nasa.gov/mission/hubble/science.nasa.gov/mission/hubble/ https://science.nasa.gov/mission/hubble/ — 200 — 49.1 KiB — 15 ms — h2https://science.nasa.gov/_static/??-eJyNkdtugzAQRH+oG6tVFfJS9Vt8WcDCN+3aEP6+DoQqlULok7XW8czOWEwJdAwZQxba2XqAL5Bc6WxgUXgyDC1Jj1OkYZ2FKtYZwXl2yCfN/CaqiA3aFYMs6oUwlqtc9CmGqsgre/I2vMATYYuEQeP/eOWiHgCNzZGePNhCbVFSTCWBlwPS3U/qQXZVcRVyVpGkGValPRX2BhZ+a6GlhTDCBoPX3Xd9UcohcDVFyFiL0zHhEua5Ye7R192CZAm6vzk9tP6KXjQ7F5V0EOR4iOJ4+6FDTFLdYkRQMgSkQ/yh7d1Olmx/yrwPHcnR5hnaSB7QK7zHht+Ov/3Xe9N8nj/Ol+byA0JFCeQ=science.nasa.gov/_static/??-eJyNkdt... https://science.nasa.gov/_static/??-eJyNkdtugzAQRH+oG6tVFfJS9Vt8WcDCN+3aEP6+DoQqlULok7XW8czOWEwJdAwZQxba2XqAL5Bc6WxgUXgyDC1Jj1OkYZ2FKtYZwXl2yCfN/CaqiA3aFYMs6oUwlqtc9CmGqsgre/I2vMATYYuEQeP/eOWiHgCNzZGePNhCbVFSTCWBlwPS3U/qQXZVcRVyVpGkGValPRX2BhZ+a6GlhTDCBoPX3Xd9UcohcDVFyFiL0zHhEua5Ye7R192CZAm6vzk9tP6KXjQ7F5V0EOR4iOJ4+6FDTFLdYkRQMgSkQ/yh7d1Olmx/yrwPHcnR5hnaSB7QK7zHht+Ov/3Xe9N8nj/Ol+byA0JFCeQ= — 200 — 69.8 KiB — 20 ms — h2https://science.nasa.gov/wp-content/uploads/pum/pum-site-styles-1.css?generated=1753194533&ver=1.21.5science.nasa.gov/wp-content/uploads... https://science.nasa.gov/wp-content/uploads/pum/pum-site-styles-1.css?generated=1753194533&ver=1.21.5 — 200 — 3.6 KiB — 11 ms — h2https://science.nasa.gov/wp-includes/js/jquery/jquery.min.js?ver=3.7.1science.nasa.gov/wp-includes/js/jqu... https://science.nasa.gov/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 31.0 KiB — 20 ms — h2https://science.nasa.gov/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1science.nasa.gov/wp-includes/js/jqu... https://science.nasa.gov/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.2 KiB — 16 ms — h2https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Regular.woff2science.nasa.gov/wp-content/client-... https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Regular.woff2 — 200 — 32.1 KiB — 22 ms — h2https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7.woff2science.nasa.gov/wp-content/client-... https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7.woff2 — 200 — 37.4 KiB — 26 ms — h2https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/db-mono/aFTU7PB1QTsUX8KYthqQBA.woff2science.nasa.gov/wp-content/client-... https://science.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/db-mono/aFTU7PB1QTsUX8KYthqQBA.woff2 — 200 — 14.4 KiB — 29 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NASA&pua=G-3MLXXCVWWY&subagency==GSFC&yt=true&dclink=true&sp=search,s,q&sdor=false&exts=tif,tiff&pga4=G-82GWVTTXCZdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NASA&pua=G-3MLXXCVWWY&subagency==GSFC&yt=true&dclink=true&sp=search,s,q&sdor=false&exts=tif,tiff&pga4=G-82GWVTTXCZ — 200 — 9.4 KiB — 125 ms — h3https://science.nasa.gov/wp-content/themes/nasa-child/assets/images/nasa-logo.svgscience.nasa.gov/wp-content/themes/... https://science.nasa.gov/wp-content/themes/nasa-child/assets/images/nasa-logo.svg — 200 — 2.7 KiB — 31 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 1699ms · 1148KB · $7/mo
science.nasa.gov
Other
Costly
Execution 616ms
Transfer 49 KB
Monthly Cost $2/mo
Unattributable
Other
Costly
Execution 324ms
Transfer 0 KB
Monthly Cost $1/mo
science.nasa.gov
Other
Optional
Execution 191ms
Transfer 31 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 149ms
Transfer 147 KB
Unused 43%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 100ms
Transfer 157 KB
Unused 43%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 95ms
Transfer 159 KB
Unused 42%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 131 KB
Unused 48%
Monthly Cost $0/mo
www.gstatic.com
Other
Optional
Execution 74ms
Transfer 362 KB
Unused 67%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 70ms
Transfer 111 KB
Unused 62%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • science.nasa.gov adds 616ms and costs ~$2/month
  • Unattributable adds 324ms and costs ~$1/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

science.nasa.gov takes 616ms 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 324ms 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

62% 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

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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