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https://darpa.mil

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
18
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

7.59 s

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

27.67 s

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

3.01 s

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

0.214

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

7.59 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.

38.76 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
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
12.4 MB transferred, 143 requests
FIX
12.4 MB transferred, 143 requests
Critical::
Page weighs 21.1 MB (12.4 MB transferred)
Warning::
Images are 5.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.7 MB
Warning::
JavaScript is 5.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 5.1 MB
Info::
CSS is 834 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 834 KB
Info::
Fonts are 221 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 221 KB
Warning::
143 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.6 g CO2 per page load
12.4 MB / 2.4 MB budget
12.4 MB transferred
143 requests
2.6 g CO2 per page load
Images 5.7 MiB 46%
JavaScript 5.1 MiB 41%
CSS 833.9 KiB 7%
Other 354.2 KiB 3%
HTML 222.2 KiB 2%
Fonts 220.7 KiB 2%
Other 3.0 KiB 0%
Other 2.7 KiB 0%
Other 454 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (12.4 MiB of 12.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9906ms total JS execution
FIX
9906ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 2614ms CPU time
Warning::
https://www.darpa.mil/: 1979ms CPU time
Warning::
Unattributable: 1510ms CPU time
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as...: 639ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-4603...: 600ms CPU time
Warning::
Third-party scripts: 9906ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 21% Style & Layout 12% Script Parsing & Compilation 11% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js2614ms2215ms208ms3rd
https://www.darpa.mil/1979ms40ms1ms3rd
Unattributable1510ms28ms0ms3rd
https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/react/18_3_1/react.production.min.js?tdvso6639ms507ms66ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4603P06FHC600ms475ms119ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L561ms434ms121ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MPT8LFHZ423ms358ms59ms3rd
https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/react/18_3_1/react-dom.production.min.js?tdvso6416ms80ms25ms3rd
https://www.darpa.mil/themes/custom/darpa_uswds/assets/dist/js/navbar.bundle.js?tdvso6229ms42ms170ms3rd
https://www.darpa.mil/themes/custom/darpa_uswds/assets/dist/js/carousel.bundle.js?tdvso6214ms158ms40ms3rd

Showing top 10 of 18 scripts

F
JS Bundles
Action
60 scripts, 1021 KB unused
FIX
60 scripts, 1021 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 157 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 157 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 157 KB unused (43%)
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/gtag/js?id=G-4603...: 65 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1021 KB
1021 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB157 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB157 KB (43%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB157 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k0147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-4603P06FHC174 KB65 KB (37%)✓3rd
https://www.darpa.mil/core/assets/vendor/jquery/jquery.min.js?v=3.7.187 KB65 KB (76%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MPT8LFHZ134 KB65 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/react/18_3_1/react-dom.production.min.js?tdvso6130 KB42 KB (33%)✓3rd
https://www.darpa.mil/core/misc/ajax.js?v=10.6.366 KB41 KB (64%)✗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
143 resources · 12.4 MB · 1021 KB savings available
FIX
143 resources · 12.4 MB · 1021 KB savings available
Warning::
Page weight 11.4 MB over 1MB target
Got: 12.4 MB Expected: ≤ 1 MB
Info::
~1021 KB of savings available
Warning::
142 third-party resources (100% of weight)
Info::
16 resources over 200KB
143 resources · 12.4 MiB · 142 third-party 11.4 MiB over 1MB target
Image 46% · 5.7 MiB
JavaScript 41% · 5.1 MiB
CSS 7% · 833.9 KiB
Other 3% · 351.7 KiB
Document 2% · 227.2 KiB
Font 2% · 220.7 KiB
Media 0% · 454 B

~1021.3 KiB of savings available

Remove unused JavaScript: 1021.3 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.

C
Image Optimization
Action
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.darpa.mil/themes/custom/darpa_uswds/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
42 images 5.7 MB
0 oversized -0 KB
42 legacy format
11 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
6 fonts (221 KB)
PASS
6 fonts (221 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

221 KB total

Render-blocking

0

of 6

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 FCP 7.6 s LCP 27.7 shttps://fonts.gstatic.com/s/inter/v20/UcCo3FwrK3iLTcviYwYZ8UA3.woff2UcCo3FwrK3iLTcviYwYZ8UA... https://fonts.gstatic.com/s/inter/v20/UcCo3FwrK3iLTcviYwYZ8UA3.woff2 — 71.3 KiB — 28 ms — font-display: swaphttps://www.darpa.mil/themes/custom/darpa_uswds/assets/dist/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.darpa.mil/themes/custom/darpa_uswds/assets/dist/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 21.3 KiB — 135 ms — font-display: swaphttps://www.darpa.mil/themes/custom/darpa_uswds/assets/dist/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.darpa.mil/themes/custom/darpa_uswds/assets/dist/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 21.1 KiB — 136 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 22 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 39.2 KiB — 15 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 16 ms — font-display: swap
UcCo3FwrK3iLTcviYwYZ8UA... woff2 swap
Size 71 KB
Load time 28 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-regular-w... woff2 swap
Size 21 KB
Load time 135 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 21 KB
Load time 136 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 22 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 39 KB
Load time 15 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 16 ms
Start 3.2 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
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
143 requests over 6055ms
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 FCP 7.6 s LCP 27.7 shttps://darpa.mil// https://darpa.mil/ — 302 — 125 B — 691 ms — http/1.0https://www.darpa.mil/www.darpa.mil/ https://www.darpa.mil/ — 200 — 87.4 KiB — 151 ms — h2https://www.darpa.mil/sites/default/files/css/css_dHTSnv6R-NO3oLg2P0KNnvo0vksxN7uJr7DF-SwRgUk.css?delta=0&language=en&theme=darpa_uswds&include=eJxdkFGKBCEMRC8kLeyFpNRMj4saSWLP9p5-G5phcX7fq1RBUoXq6RupYid1iYV8ljlQN3zj5wadpaGWX3IZMhCmvrL6BOGpVFfI3ZAsPK6TcHwtbq8cscY7jghZ0OCcoBZGxUmrEkrULXR66cK1GIXG-aPceARDXLNzJG6l74GOq-vDKUJE79fsNc7TQi6a-CA5vb04cXWNcoF_lGokW8Kwwt0NCHbBeOr7d_9km33MWIs-KTs91aj5CCV3T975P_Nmml4www.darpa.mil/sites/default/files/c... https://www.darpa.mil/sites/default/files/css/css_dHTSnv6R-NO3oLg2P0KNnvo0vksxN7uJr7DF-SwRgUk.css?delta=0&language=en&theme=darpa_uswds&include=eJxdkFGKBCEMRC8kLeyFpNRMj4saSWLP9p5-G5phcX7fq1RBUoXq6RupYid1iYV8ljlQN3zj5wadpaGWX3IZMhCmvrL6BOGpVFfI3ZAsPK6TcHwtbq8cscY7jghZ0OCcoBZGxUmrEkrULXR66cK1GIXG-aPceARDXLNzJG6l74GOq-vDKUJE79fsNc7TQi6a-CA5vb04cXWNcoF_lGokW8Kwwt0NCHbBeOr7d_9km33MWIs-KTs91aj5CCV3T975P_Nmml4 — 200 — 6.3 KiB — 34 ms — h2https://www.darpa.mil/sites/default/files/css/css_5LiDfqPo9pjLoZYsLdmDjEvoQX8D6jZvYMx4D-iR8gw.css?delta=1&language=en&theme=darpa_uswds&include=eJxdkFGKBCEMRC8kLeyFpNRMj4saSWLP9p5-G5phcX7fq1RBUoXq6RupYid1iYV8ljlQN3zj5wadpaGWX3IZMhCmvrL6BOGpVFfI3ZAsPK6TcHwtbq8cscY7jghZ0OCcoBZGxUmrEkrULXR66cK1GIXG-aPceARDXLNzJG6l74GOq-vDKUJE79fsNc7TQi6a-CA5vb04cXWNcoF_lGokW8Kwwt0NCHbBeOr7d_9km33MWIs-KTs91aj5CCV3T975P_Nmml4www.darpa.mil/sites/default/files/c... 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https://www.darpa.mil/modules/contrib/google_tag/js/gtm.js?tdvso6 — 200 — 2.4 KiB — 46 ms — h2https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/packages/usa_banner/img/us_flag_small.pngwww.darpa.mil/themes/custom/darpa_u... https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/packages/usa_banner/img/us_flag_small.png — 200 — 1.4 KiB — 45 ms — h2https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/packages/usa_banner/img/icon-dot-gov.svgwww.darpa.mil/themes/custom/darpa_u... https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/packages/usa_banner/img/icon-dot-gov.svg — 200 — 1.8 KiB — 46 ms — h2https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/packages/usa_banner/img/icon-https.svgwww.darpa.mil/themes/custom/darpa_u... https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/packages/usa_banner/img/icon-https.svg — 200 — 1.9 KiB — 27 ms — h2https://www.darpa.mil/themes/custom/darpa_uswds/logo.svgwww.darpa.mil/themes/custom/darpa_u... 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h3https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/lib/apiGatewayCore/sigV4Client.jswww.darpa.mil/themes/custom/darpa_u... https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/lib/apiGatewayCore/sigV4Client.js — 200 — 9.5 KiB — 19 ms — h2https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/lib/apiGatewayCore/apiGatewayClient.jswww.darpa.mil/themes/custom/darpa_u... https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/lib/apiGatewayCore/apiGatewayClient.js — 200 — 3.6 KiB — 26 ms — h2https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.jswww.youtube.com/s/player/1bb6ee63/w... https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js — 200 — 10.6 KiB — 17 ms — h2https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/lib/apiGatewayCore/simpleHttpClient.jswww.darpa.mil/themes/custom/darpa_u... https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/lib/apiGatewayCore/simpleHttpClient.js — 200 — 4.1 KiB — 18 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 — -1 — 0 B — 3 ms — https://www.youtube.com/s/player/1bb6ee63/www-player.csswww.youtube.com/s/player/1bb6ee63/w... https://www.youtube.com/s/player/1bb6ee63/www-player.css — 200 — 0 B — 1 ms — h2https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.KjNKUXigSn8.L.W.O/am=AAAABA/d=0/br=1/rs=AGKMywEJITLW9kQSSYb_eVLtSgu_4tU6CQwww.youtube.com/s/_/ytembeds/_/ss/k... https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.KjNKUXigSn8.L.W.O/am=AAAABA/d=0/br=1/rs=AGKMywEJITLW9kQSSYb_eVLtSgu_4tU6CQ — 200 — 0 B — 0 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=root,basewww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=root,base — 200 — 156.2 KiB — 36 ms — h3https://www.youtube.com/s/player/1bb6ee63/player_embed.vflset/en_US/base.jswww.youtube.com/s/player/1bb6ee63/p... https://www.youtube.com/s/player/1bb6ee63/player_embed.vflset/en_US/base.js — 200 — 471.9 KiB — 53 ms — h3https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 200 — 39.2 KiB — 15 ms — h3https://www.google.com/recaptcha/api2/anchor?ar=1&k=6Ld1CC8rAAAAAEkVZzTIlBekFJc8WUs4LunivygB&co=aHR0cHM6Ly93d3cuZGFycGEubWlsOjQ0Mw..&hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&size=invisible&anchor-ms=20000&execute-ms=30000&cb=fht760vc0xuswww.google.com/recaptcha/api2/ancho... https://www.google.com/recaptcha/api2/anchor?ar=1&k=6Ld1CC8rAAAAAEkVZzTIlBekFJc8WUs4LunivygB&co=aHR0cHM6Ly93d3cuZGFycGEubWlsOjQ0Mw..&hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&size=invisible&anchor-ms=20000&execute-ms=30000&cb=fht760vc0xus — 200 — 27.6 KiB — 51 ms — h3https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/lib/apiGatewayCore/utils.jswww.darpa.mil/themes/custom/darpa_u... https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/lib/apiGatewayCore/utils.js — 200 — 3.8 KiB — 36 ms — h2https://csp.withgoogle.com/csp/frame-ancestors/38fac9d5b82543fc4729580d18ff2d3dcsp.withgoogle.com/csp/frame-ancest... https://csp.withgoogle.com/csp/frame-ancestors/38fac9d5b82543fc4729580d18ff2d3d — -1 — 0 B — 70 ms — https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/apigClient.jswww.darpa.mil/themes/custom/darpa_u... https://www.darpa.mil/themes/custom/darpa_uswds/assets/js/sdk/aws_v2/apiGateway-js-sdk/apigClient.js — 200 — 7.4 KiB — 20 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.csswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.css — 200 — 42.1 KiB — 26 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 361.9 KiB — 47 ms — h2https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 115 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 0 B — 1 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=r78Drb — 200 — 202.7 KiB — 21 ms — h3https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4www.google.com/recaptcha/api2/webwo... https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4 — 200 — 23 B — 335 ms — h3https://www.gstatic.com/recaptcha/api2/logo_48.pngwww.gstatic.com/recaptcha/api2/logo... https://www.gstatic.com/recaptcha/api2/logo_48.png — 200 — 2.3 KiB — 11 ms — h2https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 33.9 KiB — 16 ms — h3https://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 — 13 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 0 B — 30 ms — h2https://www.darpa.mil/themes/custom/darpa_uswds/favicon.icowww.darpa.mil/themes/custom/darpa_u... https://www.darpa.mil/themes/custom/darpa_uswds/favicon.ico — 200 — 2.8 KiB — 701 ms — h2https://i.ytimg.com/vi/3tBE8qQl49g/sddefault.jpgi.ytimg.com/vi/3tBE8qQl49g/sddefaul... https://i.ytimg.com/vi/3tBE8qQl49g/sddefault.jpg — 200 — 44.2 KiB — 65 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 — 298 B — 13 ms — h3https://www.google.com/js/th/cN4AN9hxcU4NRvji1RMUfz3eri06TDMd9Q_fvSbDV9Q.jswww.google.com/js/th/cN4AN9hxcU4NRv... https://www.google.com/js/th/cN4AN9hxcU4NRvji1RMUfz3eri06TDMd9Q_fvSbDV9Q.js — 200 — 23.1 KiB — 10 ms — h3https://www.youtube.com/generate_204?CHDc2wwww.youtube.com/generate_204?CHDc2w https://www.youtube.com/generate_204?CHDc2w — 204 — 10 B — 7 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 24 ms — h2https://jnn-pa.googleapis.com/$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 — 19 ms — h2https://www.google.com/recaptcha/api2/reload?k=6Ld1CC8rAAAAAEkVZzTIlBekFJc8WUs4LunivygBwww.google.com/recaptcha/api2/reloa... https://www.google.com/recaptcha/api2/reload?k=6Ld1CC8rAAAAAEkVZzTIlBekFJc8WUs4LunivygB — 200 — 2.0 KiB — 70 ms — h3https://www.google.com/recaptcha/api2/clr?k=6Ld1CC8rAAAAAEkVZzTIlBekFJc8WUs4LunivygBwww.google.com/recaptcha/api2/clr?k... https://www.google.com/recaptcha/api2/clr?k=6Ld1CC8rAAAAAEkVZzTIlBekFJc8WUs4LunivygB — 200 — 16 B — 31 ms — h3https://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 — 14 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 9906ms · 3112KB · $132/mo
www.gstatic.com
Other
Costly
Execution 2614ms
Transfer 0 KB
Unused 43%
Monthly Cost $35/mo
www.darpa.mil
Other
Costly
Execution 1979ms
Transfer 87 KB
Monthly Cost $26/mo
Unattributable
Other
Costly
Execution 1510ms
Transfer 0 KB
Monthly Cost $20/mo
www.darpa.mil
Other
Costly
Execution 639ms
Transfer 12 KB
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 600ms
Transfer 174 KB
Unused 37%
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 561ms
Transfer 147 KB
Unused 42%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 423ms
Transfer 134 KB
Unused 48%
Monthly Cost $6/mo
www.darpa.mil
Other
Costly
Execution 416ms
Transfer 130 KB
Unused 33%
Monthly Cost $6/mo
www.darpa.mil
Other
Costly
Execution 229ms
Transfer 857 KB
Monthly Cost $3/mo
www.darpa.mil
Other
Costly
Execution 214ms
Transfer 194 KB
Monthly Cost $3/mo
dap.digitalgov.gov
Other
Optional
Execution 114ms
Transfer 4 KB
Monthly Cost $2/mo
www.youtube.com
Other
Optional
Execution 112ms
Transfer 11 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 103ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo
www.darpa.mil
Other
Optional
Execution 101ms
Transfer 87 KB
Unused 76%
Monthly Cost $1/mo
www.darpa.mil
Other
Optional
Execution 87ms
Transfer 377 KB
Unused 8%
Monthly Cost $1/mo
www.darpa.mil
Other
Optional
Execution 84ms
Transfer 681 KB
Monthly Cost $1/mo
www.darpa.mil
Other
Optional
Execution 70ms
Transfer 62 KB
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 52ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 2614ms and costs ~$35/month
  • www.darpa.mil adds 1979ms and costs ~$26/month
  • Unattributable adds 1510ms and costs ~$20/month
  • www.darpa.mil adds 639ms and costs ~$8/month
  • Google Tag Manager adds 600ms and costs ~$8/month
  • Google Tag Manager adds 561ms and costs ~$7/month
  • Google Tag Manager adds 423ms and costs ~$6/month
  • www.darpa.mil adds 416ms and costs ~$6/month
  • www.darpa.mil adds 229ms and costs ~$3/month
  • www.darpa.mil adds 214ms and costs ~$3/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.gstatic.com takes 2614ms 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.darpa.mil takes 1979ms 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 1510ms 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.darpa.mil takes 639ms 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 600ms 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 561ms 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 423ms 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.darpa.mil takes 416ms 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.darpa.mil takes 229ms 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.darpa.mil takes 214ms 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

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

76% of www.darpa.mil'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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