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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
39
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.

3.39 s

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

191.01 s

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

2.01 s

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

0.025

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

3.94 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.

191.03 s

Page Load Progression

535 ms
1.1 s
1.6 s
2.1 s
2.7 s
3.2 s
3.7 s
4.3 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
36.2 MB transferred, 108 requests
FIX
36.2 MB transferred, 108 requests
Critical::
Page weighs 45.1 MB (36.2 MB transferred)
Warning::
Images are 32.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 32.4 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::
108 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 7.6 g CO2 per page load
36.2 MB / 2.4 MB budget
36.2 MB transferred
108 requests
7.6 g CO2 per page load
Images 32.4 MiB 89%
JavaScript 3.0 MiB 8%
Fonts 270.8 KiB 1%
CSS 189.4 KiB 1%
Other 171.1 KiB 0%
HTML 159.1 KiB 0%
Other 2.1 KiB 0%
Other 1.7 KiB 0%
Other 1.1 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 (36.2 MiB of 36.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6969ms total JS execution
FIX
6969ms total JS execution
Warning::
https://science.nasa.gov/mission/hubble/: 2226ms CPU time
Warning::
Unattributable: 1264ms CPU time
Warning::
https://science.nasa.gov/wp-includes/js/jquery/jqu...: 1108ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 565ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NLJ...: 334ms CPU time
Warning::
Third-party scripts: 6969ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Other 27% Style & Layout 19% Script Parsing & Compilation 8% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://science.nasa.gov/mission/hubble/2226ms37ms12ms3rd
Unattributable1264ms9ms0ms3rd
https://science.nasa.gov/wp-includes/js/jquery/jquery.min.js?ver=3.7.11108ms610ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L565ms507ms54ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NLJ258M334ms220ms70ms3rd
https://www.googletagmanager.com/gtag/js?id=G-82GWVTTXCZ&cx=c&gtm=4e64k1320ms263ms55ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js308ms183ms124ms3rd
https://www.googletagmanager.com/gtag/js?id=G-3MLXXCVWWY&cx=c&gtm=4e64k1288ms233ms53ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-542RDH52231ms159ms51ms3rd
https://cdn.parsely.com/keys/science.nasa.gov/p.js?ver=3.22.0185ms169ms10ms3rd

Showing top 10 of 12 scripts

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...: 68 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 KB68 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
108 resources · 36.2 MB · 713 KB savings available
FIX
108 resources · 36.2 MB · 713 KB savings available
Warning::
Page weight 35.2 MB over 1MB target
Got: 36.2 MB Expected: ≤ 1 MB
Info::
~713 KB of savings available
Warning::
107 third-party resources (100% of weight)
Info::
5 resources over 200KB
108 resources · 36.2 MiB · 107 third-party 35.2 MiB over 1MB target
Image 89% · 32.4 MiB
JavaScript 8% · 3.0 MiB
Font 1% · 270.8 KiB
CSS 1% · 189.4 KiB
Media 0% · 171.1 KiB
Document 0% · 159.2 KiB
Other 0% · 2.8 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
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Info::
All images are well-optimized
13 images 32.4 MB
0 oversized -0 KB
12 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
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 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s 62.0 s 64.0 s 66.0 s 68.0 s 70.0 s 72.0 s 74.0 s 76.0 s 78.0 s 80.0 s 82.0 s 84.0 s 86.0 s 88.0 s 90.0 s 92.0 s 94.0 s 96.0 s 98.0 s 100.0 s 102.0 s 104.0 s 106.0 s 108.0 s 110.0 s 112.0 s 114.0 s 116.0 s 118.0 s 120.0 s 122.0 s 124.0 s 126.0 s 128.0 s 130.0 s 132.0 s 134.0 s 136.0 s 138.0 s 140.0 s 142.0 s 144.0 s 146.0 s 148.0 s 150.0 s 152.0 s 154.0 s 156.0 s 158.0 s 160.0 s 162.0 s 164.0 s 166.0 s 168.0 s 170.0 s 172.0 s 174.0 s 176.0 s 178.0 s 180.0 s 182.0 s 184.0 s 186.0 s 188.0 s 190.0 s 192.0 s 194.0 s 196.0 s 198.0 s 200.0 s FCP 3.4 s LCP 191.0 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 — 24 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 — 34 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 — 34 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 — 32 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 — 5 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 33 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 — 13 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 — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 39.2 KiB — 16 ms — font-display: swap
PublicSans-Regular.woff2 woff2 swap
Size 32 KB
Load time 24 ms
Start 105 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_fvQtM... woff2 swap
Size 37 KB
Load time 34 ms
Start 105 ms
Risk FOUT — text flashes from fallback to web font
aFTU7PB1QTsUX8KYthqQBA.... woff2 swap
Size 14 KB
Load time 34 ms
Start 106 ms
Risk FOUT — text flashes from fallback to web font
UcCO3FwrK3iLTeHuS_fvQtM... woff2 swap
Size 17 KB
Load time 32 ms
Start 269 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 32 KB
Load time 5 ms
Start 348 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 33 ms
Start 454 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Italic.woff2 woff2 swap
Size 33 KB
Load time 13 ms
Start 482 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-BoldItalic.w... woff2 swap
Size 33 KB
Load time 16 ms
Start 483 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 39 KB
Load time 16 ms
Start 1.1 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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
2
prefetch
—

5 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
108 requests over 4234ms
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 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s 62.0 s 64.0 s 66.0 s 68.0 s 70.0 s 72.0 s 74.0 s 76.0 s 78.0 s 80.0 s 82.0 s 84.0 s 86.0 s 88.0 s 90.0 s 92.0 s 94.0 s 96.0 s 98.0 s 100.0 s 102.0 s 104.0 s 106.0 s 108.0 s 110.0 s 112.0 s 114.0 s 116.0 s 118.0 s 120.0 s 122.0 s 124.0 s 126.0 s 128.0 s 130.0 s 132.0 s 134.0 s 136.0 s 138.0 s 140.0 s 142.0 s 144.0 s 146.0 s 148.0 s 150.0 s 152.0 s 154.0 s 156.0 s 158.0 s 160.0 s 162.0 s 164.0 s 166.0 s 168.0 s 170.0 s 172.0 s 174.0 s 176.0 s 178.0 s 180.0 s 182.0 s 184.0 s 186.0 s 188.0 s 190.0 s 192.0 s 194.0 s 196.0 s 198.0 s 200.0 s FCP 3.4 s LCP 191.0 shttps://hubblesite.org// https://hubblesite.org/ — 301 — 120 B — 70 ms — h2https://science.nasa.gov/mission/hubble/science.nasa.gov/mission/hubble/ https://science.nasa.gov/mission/hubble/ — 200 — 49.1 KiB — 14 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 — 40 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... 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https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64k1v9131934939za200zb9208487001zd9208487001&_p=1776899778785&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1184927595.1776899780&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400~117512543&dl=https%3A%2F%2Fscience.nasa.gov%2Fmission%2Fhubble%2F&dt=Hubble%20Space%20Telescope%20-%20NASA%20Science&dr=&sid=1776899780&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&ep.agency=NASA&ep.subagency=NASA.GOV&ep.site_topic=unspecified%3Anasa.gov&ep.site_platform=unspecified%3Anasa.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=pga4&ep.hostname_dimension=science.nasa.gov&tfd=1478 — 204 — 549 B — 138 ms — h2https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 21 ms — h3https://i.ytimg.com/vi/QFwfV2A1ZgY/sddefault.jpgi.ytimg.com/vi/QFwfV2A1ZgY/sddefaul... https://i.ytimg.com/vi/QFwfV2A1ZgY/sddefault.jpg — 200 — 44.7 KiB — 42 ms — h2https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svgwww.gstatic.com/youtube/img/icons/m... https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svg — 200 — 726 B — 34 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-3MLXXCVWWY&gtm=45je64k1v9135925242za200zb9208487001zd9208487001&_p=1776899778785&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1184927595.1776899780&frm=0&pscdl=noapi&rcb=5&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266401~117384405~117512543&dl=https%3A%2F%2Fscience.nasa.gov%2Fmission%2Fhubble%2F&dt=Hubble%20Space%20Telescope%20-%20NASA%20Science&dr=&sid=1776899780&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1816www.google-analytics.com/g/collect?... 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h2https://www.google-analytics.com/g/collect?v=2&tid=G-82GWVTTXCZ&gtm=45je64k1v9208077663z8831201591za200zb9208487001zd9208487001&_p=1776899778785&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1184927595.1776899780&frm=0&pscdl=noapi&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512543~117884344~118128922&sid=1776899780&sct=1&seg=0&dl=https%3A%2F%2Fscience.nasa.gov%2Fmission%2Fhubble%2F&dt=Hubble%20Space%20Telescope%20-%20NASA%20Science&en=page_view&_fv=1&_ss=1&tfd=1904www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-82GWVTTXCZ&gtm=45je64k1v9208077663z8831201591za200zb9208487001zd9208487001&_p=1776899778785&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1184927595.1776899780&frm=0&pscdl=noapi&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512543~117884344~118128922&sid=1776899780&sct=1&seg=0&dl=https%3A%2F%2Fscience.nasa.gov%2Fmission%2Fhubble%2F&dt=Hubble%20Space%20Telescope%20-%20NASA%20Science&en=page_view&_fv=1&_ss=1&tfd=1904 — 204 — 20 B — 40 ms — h3https://www.google.com/js/th/Tsj2rE80jstpz6Q1k9XA1bynyWMKlWaB3UmUIkCsRnA.jswww.google.com/js/th/Tsj2rE80jstpz6... https://www.google.com/js/th/Tsj2rE80jstpz6Q1k9XA1bynyWMKlWaB3UmUIkCsRnA.js — 200 — 23.3 KiB — 32 ms — h3https://science.nasa.gov/wp-content/plugins/nasa-hds-core-setup/assets/favicons/favicon-32x32.pngscience.nasa.gov/wp-content/plugins... https://science.nasa.gov/wp-content/plugins/nasa-hds-core-setup/assets/favicons/favicon-32x32.png — 200 — 1.9 KiB — 4 ms — h2https://www.youtube.com/generate_204?mjPsZgwww.youtube.com/generate_204?mjPsZg https://www.youtube.com/generate_204?mjPsZg — 204 — 10 B — 3 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 27 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 312 B — 16 ms — h2https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 29 ms — h3
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 6969ms · 1363KB · $28/mo
science.nasa.gov
Other
Costly
Execution 2226ms
Transfer 49 KB
Monthly Cost $9/mo
Unattributable
Other
Costly
Execution 1264ms
Transfer 0 KB
Monthly Cost $5/mo
science.nasa.gov
Other
Costly
Execution 1108ms
Transfer 31 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 565ms
Transfer 147 KB
Unused 43%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 334ms
Transfer 131 KB
Unused 48%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Costly
Execution 320ms
Transfer 159 KB
Unused 42%
Monthly Cost $1/mo
www.gstatic.com
Other
Costly
Execution 308ms
Transfer 362 KB
Unused 67%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Costly
Execution 288ms
Transfer 157 KB
Unused 43%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Costly
Execution 231ms
Transfer 111 KB
Unused 62%
Monthly Cost $1/mo
cdn.parsely.com
Other
Optional
Execution 185ms
Transfer 27 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 147 KB
Unused 72%
Monthly Cost $0/mo
science.nasa.gov
Other
Optional
Execution 62ms
Transfer 42 KB
Unused 87%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • science.nasa.gov adds 2226ms and costs ~$9/month
  • Unattributable adds 1264ms and costs ~$5/month
  • science.nasa.gov adds 1108ms and costs ~$4/month
  • Google Tag Manager adds 565ms and costs ~$2/month
  • Google Tag Manager adds 334ms and costs ~$1/month
  • Google Tag Manager adds 320ms and costs ~$1/month
  • www.gstatic.com adds 308ms and costs ~$1/month
  • Google Tag Manager adds 288ms and costs ~$1/month
  • Google Tag Manager adds 231ms 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 2226ms 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 1264ms 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

science.nasa.gov takes 1108ms 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 565ms 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 334ms 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 320ms 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 308ms 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

Google Tag Manager takes 288ms 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 231ms 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

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

72% 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

87% of science.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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