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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
57
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.
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.

2.71 s

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

16.06 s

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

456 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.

4.44 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.

18.14 s

Page Load Progression

408 ms
816 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.9 s
3.3 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
7.4 MB transferred, 72 requests
FIX
7.4 MB transferred, 72 requests
Critical::
Page weighs 9.3 MB (7.4 MB transferred)
Warning::
Images are 6.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.5 MB
Warning::
JavaScript is 645 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 645 KB
Info::
72 HTTP requests
Info::
Estimated 1.5 g CO2 per page load
7.4 MB / 2.4 MB budget
7.4 MB transferred
72 requests
1.5 g CO2 per page load
Images 6.5 MiB 88%
JavaScript 644.7 KiB 9%
Fonts 132.5 KiB 2%
CSS 66.6 KiB 1%
HTML 41.8 KiB 1%
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 (7.4 MiB of 7.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3335ms total JS execution
FIX
3335ms total JS execution
Warning::
https://www.nasa.gov/: 1481ms CPU time
Warning::
Unattributable: 506ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 322ms CPU time
Warning::
https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4...: 297ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-82GW...: 283ms CPU time
Warning::
Third-party scripts: 3335ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Other 29% Style & Layout 15% Rendering 9% Script Parsing & Compilation 6% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.nasa.gov/1481ms21ms10ms3rd
Unattributable506ms8ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L322ms279ms42ms3rd
https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4FQ2w3iLKa10lSxHfIplNNTBAtWBMma2bw3srkFcDL4MlIy83bXQnH9VMNOmjntzC8I2NmImb7hQSWTZJMn4k0RTPjyrNcLehBcKiCTFMhqracK6ctd5Z1/PJAd00OlNpomjARJB4e+gkaUURmChhJgdCl4XDflzKd91x3bQ9v37fwEdw+D+A==297ms223ms31ms3rd
https://www.googletagmanager.com/gtag/js?id=G-82GWVTTXCZ&cx=c&gtm=4e64f0h1283ms234ms46ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLJ258M265ms223ms38ms3rd
https://cdn.parsely.com/keys/nasa.gov/p.js?ver=3.22.0128ms118ms6ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js53ms49ms1ms3rd
D
Page Weight Inventory
Action
72 resources · 7.4 MB · 244 KB savings available
FIX
72 resources · 7.4 MB · 244 KB savings available
Warning::
Page weight 6.4 MB over 1MB target
Got: 7.4 MB Expected: ≤ 1 MB
Info::
~244 KB of savings available
Warning::
71 third-party resources (100% of weight)
Info::
8 resources over 200KB
72 resources · 7.4 MiB · 71 third-party 6.4 MiB over 1MB target
Image 88% · 6.5 MiB
JavaScript 9% · 644.7 KiB
Font 2% · 132.5 KiB
CSS 1% · 66.6 KiB
Document 1% · 42.0 KiB
Other 0% · 2.1 KiB

~244.3 KiB of savings available

Remove unused JavaScript: 244.3 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
37 images, 0 KB saveable
REVIEW
37 images, 0 KB saveable
Info::
All images are well-optimized
37 images 6.5 MB
0 oversized -0 KB
19 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
19 scripts, 244 KB unused
REVIEW
19 scripts, 244 KB unused
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/gtm.js?id=GTM-NLJ...: 63 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 58 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4...: 36 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nasa.gov/_static/??-eJx9jVsOgjAQRTdkmW...: 22 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 244 KB
244 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-82GWVTTXCZ&cx=c&gtm=4e64f0h1159 KB66 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLJ258M131 KB63 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB58 KB (39%)✓3rd
https://www.nasa.gov/_static/??-eJyNjksOwjAMRC+EG4FQ2w3iLKa10lSxHfIplNNTBAtWBMma2bw3srkFcDL4MlIy83bXQnH9VMNOmjntzC8I2NmImb7hQSWTZJMn4k0RTPjyrNcLehBcKiCTFMhqracK6ctd5Z1/PJAd00OlNpomjARJB4e+gkaUURmChhJgdCl4XDflzKd91x3bQ9v37fwEdw+D+A==64 KB36 KB (56%)✓3rd
https://www.nasa.gov/_static/??-eJx9jVsOgjAQRTdkmWgU+DGupZahmdKXnVbD7kWIaIz6M7mZcx9wi0IFn9FniLZo8gw6ySvlUfQhOX7QnjRIZswM5oUXIDriaOVYOfKV4Q1MheSVLR3ObnMpmEYoBCokfHd9zsYQSxRODphgKs3PSaaMvzJeshRnG9TAq92SGpb7b+1Lcn45qVcxZU/uuG2afb2r2/Zg7tp+cEs=36 KB22 KB (62%)✓3rd
https://cdn.parsely.com/keys/nasa.gov/p.js?ver=3.22.026 KB—✓3rd
https://www.nasa.gov/wp-content/plugins/gravityforms/assets/js/dist/vendor-theme.min.js?ver=4f8b3915c1c1e1a6800825abd64b03cb8 KB—✓3rd
https://www.nasa.gov/wp-content/plugins/wp-parsely/build/loader.js?ver=ecf94842061bea03d54b2 KB—✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NASA&pga4=G-82GWVTTXCZ9 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

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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 2.7 s LCP 16.1 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 — 20 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 — 30 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 — 34 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 — 74 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 — 58 ms — font-display: swap
PublicSans-Regular.woff2 woff2 swap
Size 32 KB
Load time 20 ms
Start 191 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_fvQtM... woff2 swap
Size 37 KB
Load time 30 ms
Start 192 ms
Risk FOUT — text flashes from fallback to web font
aFTU7PB1QTsUX8KYthqQBA.... woff2 swap
Size 14 KB
Load time 34 ms
Start 192 ms
Risk FOUT — text flashes from fallback to web font
UcCO3FwrK3iLTeHuS_fvQtM... woff2 swap
Size 17 KB
Load time 74 ms
Start 299 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 32 KB
Load time 58 ms
Start 408 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
1
prefetch
—

4 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
72 requests over 920ms
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 FCP 2.7 s LCP 16.1 shttps://nasa.gov// https://nasa.gov/ — 302 — 166 B — 160 ms — h2https://www.nasa.gov/www.nasa.gov/ https://www.nasa.gov/ — 200 — 41.8 KiB — 13 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 — 35 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 — 20 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 — 30 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 — 34 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 — 55 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 — 29 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 — 55 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 — 54 ms — h2https://www.nasa.gov/wp-content/uploads/2026/04/jsc2026e014313.jpg?resize=768,768www.nasa.gov/wp-content/uploads/202... https://www.nasa.gov/wp-content/uploads/2026/04/jsc2026e014313.jpg?resize=768,768 — 200 — 20.7 KiB — 28 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 — 5 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 — 66 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 3335ms · 574KB · $44/mo
www.nasa.gov
Other
Costly
Execution 1481ms
Transfer 42 KB
Monthly Cost $20/mo
Unattributable
Other
Costly
Execution 506ms
Transfer 0 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 322ms
Transfer 147 KB
Unused 39%
Monthly Cost $4/mo
www.nasa.gov
Other
Costly
Execution 297ms
Transfer 64 KB
Unused 56%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 283ms
Transfer 159 KB
Unused 41%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 265ms
Transfer 131 KB
Unused 48%
Monthly Cost $4/mo
cdn.parsely.com
Other
Optional
Execution 128ms
Transfer 26 KB
Monthly Cost $2/mo
dap.digitalgov.gov
Other
Optional
Execution 53ms
Transfer 4 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.nasa.gov adds 1481ms and costs ~$20/month
  • Unattributable adds 506ms and costs ~$7/month
  • Google Tag Manager adds 322ms and costs ~$4/month
  • www.nasa.gov adds 297ms and costs ~$4/month
  • Google Tag Manager adds 283ms and costs ~$4/month
  • Google Tag Manager adds 265ms 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 1481ms 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 506ms 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 322ms 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.nasa.gov takes 297ms 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

56% 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

Google Tag Manager takes 283ms 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 265ms 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

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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