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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

757 ms

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

3.84 s

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

2 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.

1.58 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.

4.06 s

Page Load Progression

383 ms
767 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
8.5 MB transferred, 79 requests
FIX
8.5 MB transferred, 79 requests
Critical::
Page weighs 10.7 MB (8.5 MB transferred)
Warning::
Images are 7.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 7.5 MB
Warning::
JavaScript is 792 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 792 KB
Info::
79 HTTP requests
Info::
Estimated 1.8 g CO2 per page load
8.5 MB / 2.4 MB budget
8.5 MB transferred
79 requests
1.8 g CO2 per page load
Images 7.5 MiB 88%
JavaScript 791.8 KiB 9%
Fonts 132.5 KiB 2%
CSS 66.6 KiB 1%
HTML 41.8 KiB 0%
Other 2.1 KiB 0%
Other 932 B 0%
Other 684 B 0%
Other 580 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

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 (8.5 MiB of 8.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
20 scripts, 351 KB unused
FIX
20 scripts, 351 KB unused
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/gtag/js?id=G-82GW...: 66 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 61 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NLJ...: 60 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4...: 36 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 351 KB
351 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f0147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-82GWVTTXCZ&cx=c&gtm=4e64f0159 KB66 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB61 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLJ258M131 KB60 KB (46%)✓3rd
https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4FQ2w3iLKa10lSxHfIplNNTBAtWBMma2bw3srkFcDL4MlIy83bXQnH9VMNOmjntzC8I2NmImb7hQSWTZJMn4k0RTPjyrNcLehBcKiCTFMhqracK6ctd5Z1/PJAd00OlNpomjARJB4e+gkaUURmChhJgdCl4XDflzKd91x3bQ9v37fwEdw+D+A==64 KB36 KB (57%)✓3rd
https://www.nasa.gov/_static/??-eJx9jVsOgjAQRTdkmWgU+DGupZahmdKXnVbD7kWIaIz6M7mZcx9wi0IFn9FniLZo8gw6ySvlUfQhOX7QnjRIZswM5oUXIDriaOVYOfKV4Q1MheSVLR3ObnMpmEYoBCokfHd9zsYQSxRODphgKs3PSaaMvzJeshRnG9TAq92SGpb7b+1Lcn45qVcxZU/uuG2afb2r2/Zg7tp+cEs=36 KB22 KB (62%)✓3rd
https://www.nasa.gov/_static/??/wp-content/plugins/accessibility-checker-pro/build/frontendFixes.bundle.js,/wp-includes/js/dist/dom-ready.min.js?m=1774626885j2 KB—✓3rd
https://www.nasa.gov/wp-content/plugins/gravityforms/assets/js/dist/scripts-theme.min.js?ver=a1e4be6ab14e0f896212221fc6ec8edd13 KB—✓3rd
https://cdn.parsely.com/keys/nasa.gov/p.js?ver=3.22.026 KB—✓3rd
https://www.nasa.gov/wp-content/plugins/accessibility-checker/build/frontendFixes.bundle.js?ver=1.38.04 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

D
Page Weight Inventory
Action
79 resources · 8.5 MB · 351 KB savings available
FIX
79 resources · 8.5 MB · 351 KB savings available
Warning::
Page weight 7.5 MB over 1MB target
Got: 8.5 MB Expected: ≤ 1 MB
Info::
~351 KB of savings available
Warning::
78 third-party resources (100% of weight)
Info::
9 resources over 200KB
79 resources · 8.5 MiB · 78 third-party 7.5 MiB over 1MB target
Image 88% · 7.5 MiB
JavaScript 9% · 791.8 KiB
Font 2% · 132.5 KiB
CSS 1% · 66.6 KiB
Document 0% · 42.0 KiB
Other 0% · 2.1 KiB

~350.7 KiB of savings available

Remove unused JavaScript: 350.7 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
43 images, 0 KB saveable
REVIEW
43 images, 0 KB saveable
Info::
All images are well-optimized
43 images 7.5 MB
0 oversized -0 KB
19 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
635ms total JS execution
REVIEW
635ms total JS execution
Warning::
https://www.nasa.gov/: 333ms CPU time
Info::
Unattributable: 118ms CPU time
Info::
https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4...: 66ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 61ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-82GW...: 56ms CPU time
Warning::
Third-party scripts: 635ms (100% of total)

Main Thread Breakdown

Script Evaluation 33% Other 30% Style & Layout 15% Rendering 9% Script Parsing & Compilation 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.nasa.gov/333ms7ms2ms3rd
Unattributable118ms1ms0ms3rd
https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4FQ2w3iLKa10lSxHfIplNNTBAtWBMma2bw3srkFcDL4MlIy83bXQnH9VMNOmjntzC8I2NmImb7hQSWTZJMn4k0RTPjyrNcLehBcKiCTFMhqracK6ctd5Z1/PJAd00OlNpomjARJB4e+gkaUURmChhJgdCl4XDflzKd91x3bQ9v37fwEdw+D+A==66ms50ms5ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L61ms53ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-82GWVTTXCZ&cx=c&gtm=4e64f056ms46ms10ms3rd
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
5 fonts (132 KB)
PASS
5 fonts (132 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

132 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 757 ms LCP 3.8 shttps://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Regular.woff2PublicSans-Regular.woff2 https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Regular.woff2 — 32.1 KiB — 22 ms — font-display: swaphttps://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7.woff2UcC73FwrK3iLTeHuS_fvQtM... https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7.woff2 — 37.4 KiB — 32 ms — font-display: swaphttps://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/db-mono/aFTU7PB1QTsUX8KYthqQBA.woff2aFTU7PB1QTsUX8KYthqQBA.... https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/db-mono/aFTU7PB1QTsUX8KYthqQBA.woff2 — 14.4 KiB — 32 ms — font-display: swaphttps://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiA.woff2UcCO3FwrK3iLTeHuS_fvQtM... https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiA.woff2 — 16.6 KiB — 26 ms — font-display: swaphttps://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Bold.woff2PublicSans-Bold.woff2 https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Bold.woff2 — 32.0 KiB — 24 ms — font-display: swap
PublicSans-Regular.woff2 woff2 swap
Size 32 KB
Load time 22 ms
Start 23 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_fvQtM... woff2 swap
Size 37 KB
Load time 32 ms
Start 23 ms
Risk FOUT — text flashes from fallback to web font
aFTU7PB1QTsUX8KYthqQBA.... woff2 swap
Size 14 KB
Load time 32 ms
Start 23 ms
Risk FOUT — text flashes from fallback to web font
UcCO3FwrK3iLTeHuS_fvQtM... woff2 swap
Size 17 KB
Load time 26 ms
Start 191 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 32 KB
Load time 24 ms
Start 195 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
79 requests over 697ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 757 ms LCP 3.8 shttps://nasa.gov// https://nasa.gov/ — 302 — 162 B — 6 ms — h2https://www.nasa.gov/www.nasa.gov/ https://www.nasa.gov/ — 200 — 41.8 KiB — 6 ms — h2https://www.nasa.gov/_static/??-eJyNkNFuwyAMRX9oFG1Tm71U+xYDbopiDLIhUf++tGmlaZqWPiFbx8e+2KUYn7kiV+sp9sekZgq1MbLapktQcxJIuGSZ1tq6FilYrRdC3XnVN9slkT21gGp7w4aoXZdTydyNurK7FPkfvAieUJA9vsY7yn4yGGLN8sfAM9QzSsmlFZNgQnnsAz/B2I2riKITkItZTb8t9YypowwK9wtGyg7IMMybKM63L9jEQPw5zmgcMKNs4j/i3NjvdHwfhsPHMHzuv67yLq9Awww.nasa.gov/_static/??-eJyNkNFuwyA... https://www.nasa.gov/_static/??-eJyNkNFuwyAMRX9oFG1Tm71U+xYDbopiDLIhUf++tGmlaZqWPiFbx8e+2KUYn7kiV+sp9sekZgq1MbLapktQcxJIuGSZ1tq6FilYrRdC3XnVN9slkT21gGp7w4aoXZdTydyNurK7FPkfvAieUJA9vsY7yn4yGGLN8sfAM9QzSsmlFZNgQnnsAz/B2I2riKITkItZTb8t9YypowwK9wtGyg7IMMybKM63L9jEQPw5zmgcMKNs4j/i3NjvdHwfhsPHMHzuv67yLq9A — 200 — 63.7 KiB — 27 ms — h2https://www.nasa.gov/wp-content/plugins/popup-maker/dist/assets/site.css?m=1765310877gwww.nasa.gov/wp-content/plugins/pop... https://www.nasa.gov/wp-content/plugins/popup-maker/dist/assets/site.css?m=1765310877g — 200 — 2.1 KiB — 17 ms — h2https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Regular.woff2www.nasa.gov/wp-content/client-mu-p... https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts/public-sans/PublicSans-Regular.woff2 — 200 — 32.1 KiB — 22 ms — h2https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7.woff2www.nasa.gov/wp-content/client-mu-p... https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/inter/UcC73FwrK3iLTeHuS_fvQtMwCp50KnMa1ZL7.woff2 — 200 — 37.4 KiB — 32 ms — h2https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/db-mono/aFTU7PB1QTsUX8KYthqQBA.woff2www.nasa.gov/wp-content/client-mu-p... https://www.nasa.gov/wp-content/client-mu-plugins/uswds-framework/uswds/fonts-split/db-mono/aFTU7PB1QTsUX8KYthqQBA.woff2 — 200 — 14.4 KiB — 32 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NASA&pga4=G-82GWVTTXCZdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NASA&pga4=G-82GWVTTXCZ — 200 — 9.4 KiB — 30 ms — h3https://www.nasa.gov/wp-content/plugins/nasa-blocks/assets/slick/slick.css?m=1765217916gwww.nasa.gov/wp-content/plugins/nas... https://www.nasa.gov/wp-content/plugins/nasa-blocks/assets/slick/slick.css?m=1765217916g — 200 — 859 B — 17 ms — h2https://www.nasa.gov/wp-content/themes/nasa/assets/images/nasa-logo.svgwww.nasa.gov/wp-content/themes/nasa... https://www.nasa.gov/wp-content/themes/nasa/assets/images/nasa-logo.svg — 200 — 2.7 KiB — 31 ms — h2https://assets.science.nasa.gov/dynamicimage/assets/science/missions/hubble/galaxies/spiral/Hubble_IC486.jpg?w=1024assets.science.nasa.gov/dynamicimag... https://assets.science.nasa.gov/dynamicimage/assets/science/missions/hubble/galaxies/spiral/Hubble_IC486.jpg?w=1024 — 200 — 65.8 KiB — 36 ms — h2https://assets.science.nasa.gov/dynamicimage/assets/science/esd/eo/images/iotd/2026/earthset-from-the-lunar-far-side/earthset_55192132107_00dc598014_o.jpg?w=1024assets.science.nasa.gov/dynamicimag... https://assets.science.nasa.gov/dynamicimage/assets/science/esd/eo/images/iotd/2026/earthset-from-the-lunar-far-side/earthset_55192132107_00dc598014_o.jpg?w=1024 — 200 — 58.5 KiB — 36 ms — h2https://www.nasa.gov/wp-content/uploads/2026/04/jsc2026e014313.jpg?resize=1024,1024www.nasa.gov/wp-content/uploads/202... https://www.nasa.gov/wp-content/uploads/2026/04/jsc2026e014313.jpg?resize=1024,1024 — 200 — 35.7 KiB — 30 ms — h2https://www.nasa.gov/wp-includes/js/dist/hooks.min.js?m=1774626885gwww.nasa.gov/wp-includes/js/dist/ho... https://www.nasa.gov/wp-includes/js/dist/hooks.min.js?m=1774626885g — 200 — 2.2 KiB — 6 ms — h2https://www.nasa.gov/wp-content/plugins/nasa-hds-core-setup/assets/favicons/site.webmanifestwww.nasa.gov/wp-content/plugins/nas... https://www.nasa.gov/wp-content/plugins/nasa-hds-core-setup/assets/favicons/site.webmanifest — 200 — 684 B — 11 ms — h2https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4FQ2w3iLKa10lSxHfIplNNTBAtWBMma2bw3srkFcDL4MlIy83bXQnH9VMNOmjntzC8I2NmImb7hQSWTZJMn4k0RTPjyrNcLehBcKiCTFMhqracK6ctd5Z1/PJAd00OlNpomjARJB4e+gkaUURmChhJgdCl4XDflzKd91x3bQ9v37fwEdw+D+A==www.nasa.gov/_static/??-eJyNjksOwjA... https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4FQ2w3iLKa10lSxHfIplNNTBAtWBMma2bw3srkFcDL4MlIy83bXQnH9VMNOmjntzC8I2NmImb7hQSWTZJMn4k0RTPjyrNcLehBcKiCTFMhqracK6ctd5Z1/PJAd00OlNpomjARJB4e+gkaUURmChhJgdCl4XDflzKd91x3bQ9v37fwEdw+D+A== — 200 — 64.0 KiB — 49 ms — h2https://www.nasa.gov/wp-content/plugins/gravityforms/js/jquery.json.min.js?ver=2.9.31www.nasa.gov/wp-content/plugins/gra... https://www.nasa.gov/wp-content/plugins/gravityforms/js/jquery.json.min.js?ver=2.9.31 — 200 — 1.2 KiB — 42 ms — h2https://www.nasa.gov/wp-content/plugins/gravityforms/js/gravityforms.min.js?ver=2.9.31www.nasa.gov/wp-content/plugins/gra... https://www.nasa.gov/wp-content/plugins/gravityforms/js/gravityforms.min.js?ver=2.9.31 — 200 — 13.5 KiB — 45 ms — h2https://www.nasa.gov/wp-content/plugins/gravityforms/assets/js/dist/utils.min.js?ver=3f278756f0a3032bed328ff6a9f6c01dwww.nasa.gov/wp-content/plugins/gra... https://www.nasa.gov/wp-content/plugins/gravityforms/assets/js/dist/utils.min.js?ver=3f278756f0a3032bed328ff6a9f6c01d — 200 — 17.5 KiB — 46 ms — h2https://images-assets.nasa.gov/image/art002e008486/art002e008486~large.jpg?w=1536&h=1152&fit=crop&crop=faces%2Cfocalpointimages-assets.nasa.gov/image/art002... 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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 635ms · 413KB · $8/mo
www.nasa.gov
Other
Costly
Execution 333ms
Transfer 42 KB
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 118ms
Transfer 0 KB
Monthly Cost $2/mo
www.nasa.gov
Other
Optional
Execution 66ms
Transfer 64 KB
Unused 57%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 147 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 159 KB
Unused 41%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.nasa.gov adds 333ms and costs ~$4/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.nasa.gov takes 333ms 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

57% of www.nasa.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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