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https://cia.gov

Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
5
REVIEW
7
PASS
11
INFO
2

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

Mobile Desktop
68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.
82
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.

2.86 s

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

6.40 s

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

143 ms

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

0.002

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

4.70 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.

14.10 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
25
11 PASS 7 REVIEW 5 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 62 requests
FIX
3.1 MB transferred, 62 requests
Warning::
Page weighs 5.8 MB (3.1 MB transferred)
Warning::
Images are 2.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.1 MB
Info::
Fonts are 252 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 252 KB
Info::
62 HTTP requests
Info::
Estimated 0.65 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
62 requests
0.65 g CO2 per page load
Images 2.1 MiB 67%
JavaScript 385.8 KiB 12%
Fonts 251.8 KiB 8%
Other 166.8 KiB 5%
HTML 94.5 KiB 3%
Other 94.2 KiB 3%
Other 41.2 KiB 1%
Other 1.3 KiB 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

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

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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3098ms total JS execution
FIX
3098ms total JS execution
Warning::
https://www.cia.gov/: 1293ms CPU time
Warning::
Unattributable: 909ms CPU time
Warning::
https://www.cia.gov/framework-481beeb6bc5ccc2a4757...: 443ms CPU time
Info::
https://www.cia.gov/app-62ee185fab1316a9cd60.js: 237ms CPU time
Info::
https://www.cia.gov/component---src-templates-page...: 216ms CPU time
Warning::
Third-party scripts: 2189ms (71% of total)

Main Thread Breakdown

Other 41% Script Evaluation 29% Style & Layout 16% Rendering 6% Script Parsing & Compilation 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.cia.gov/1293ms62ms7ms3rd
Unattributable909ms218ms0ms1st
https://www.cia.gov/framework-481beeb6bc5ccc2a4757.js443ms322ms11ms3rd
https://www.cia.gov/app-62ee185fab1316a9cd60.js237ms118ms8ms3rd
https://www.cia.gov/component---src-templates-page-js-515ef423c2c2e5884bd6.js216ms167ms36ms3rd
D
Page Weight Inventory
Action
62 resources · 3.1 MB · 131 KB savings available
FIX
62 resources · 3.1 MB · 131 KB savings available
Warning::
Page weight 3.1 MB exceeds 1 MB target by 2.1 MB
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~131 KB of savings available
Warning::
61 third-party resources (100% of weight)
Info::
1 resources over 200KB
62 resources · 3.1 MiB · 61 third-party 2.1 MiB over 1MB target
Image 69% · 2.1 MiB
JavaScript 12% · 385.8 KiB
Font 8% · 251.8 KiB
Document 6% · 188.6 KiB
Other 5% · 168.9 KiB

~131.2 KiB of savings available

Remove unused JavaScript: 131.2 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
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://www.cia.gov/static/Freedom250seal_Gold-New... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 2.1 MB
0 oversized -0 KB
7 legacy format
1 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

B
JS Bundles
13 scripts, 131 KB unused
REVIEW
13 scripts, 131 KB unused
Warning::
https://www.cia.gov/component---src-templates-page...: 61 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cia.gov/commons-05cdedd53ab155243764.j...: 27 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cia.gov/b637e9a5-e830966c7b78245dccc9....: 23 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cia.gov/js2/verification.js: 21 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 131 KB
131 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.cia.gov/component---src-templates-page-js-515ef423c2c2e5884bd6.js99 KB61 KB (62%)✓3rd
https://www.cia.gov/commons-05cdedd53ab155243764.js57 KB27 KB (48%)✓3rd
https://www.cia.gov/b637e9a5-e830966c7b78245dccc9.js31 KB23 KB (76%)✓3rd
https://www.cia.gov/js2/verification.js30 KB21 KB (72%)✓3rd
https://www.cia.gov/framework-481beeb6bc5ccc2a4757.js45 KB—✓3rd
https://www.cia.gov/js2/languages.js11 KB—✗3rd
https://www.cia.gov/app-62ee185fab1316a9cd60.js28 KB—✓3rd
https://www.cia.gov/75fc9c18-ad310dbbcd6f2aca941e.js20 KB—✓3rd
https://www.cia.gov/js2/pubkey.js1 KB—✓3rd
https://www.cia.gov/9732ccd59472190f98e17ef880683c74ce62c2d0-f876f95473acd3d1a933.js31 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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
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 (252 KB)
PASS
6 fonts (252 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

252 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.9 s LCP 6.4 shttps://www.cia.gov/static/PublicSans-Light-05ff7d7149c9a6d61fc10c3842f14215.woffPublicSans-Light-05ff7d... https://www.cia.gov/static/PublicSans-Light-05ff7d7149c9a6d61fc10c3842f14215.woff — 41.2 KiB — 212 ms — font-display: swaphttps://www.cia.gov/static/GT-America-Mono-Bold-5cb65dbcadbc053b4803a3de9e5204a1.woff2GT-America-Mono-Bold-5c... https://www.cia.gov/static/GT-America-Mono-Bold-5cb65dbcadbc053b4803a3de9e5204a1.woff2 — 35.8 KiB — 280 ms — font-display: swaphttps://www.cia.gov/static/PublicSans-Bold-c5f1403759929abd85bf95108c08b4ac.woff2PublicSans-Bold-c5f1403... https://www.cia.gov/static/PublicSans-Bold-c5f1403759929abd85bf95108c08b4ac.woff2 — 33.5 KiB — 247 ms — font-display: swaphttps://www.cia.gov/static/GT-Sectra-Fine-Bold-23b3344434247f9eb8cabd9f5e923ee3.woff2GT-Sectra-Fine-Bold-23b... https://www.cia.gov/static/GT-Sectra-Fine-Bold-23b3344434247f9eb8cabd9f5e923ee3.woff2 — 69.7 KiB — 427 ms — font-display: swaphttps://www.cia.gov/static/PublicSans-Bold-a239fb971af47134c0c330b3d38f8288.woffPublicSans-Bold-a239fb9... https://www.cia.gov/static/PublicSans-Bold-a239fb971af47134c0c330b3d38f8288.woff — 41.4 KiB — 390 ms — font-display: swaphttps://www.cia.gov/static/PublicSans-ExtraBold-06e2dc3ec7db555110e527b86b93d913.woff2PublicSans-ExtraBold-06... https://www.cia.gov/static/PublicSans-ExtraBold-06e2dc3ec7db555110e527b86b93d913.woff2 — 30.2 KiB — 317 ms — font-display: swap
PublicSans-Light-05ff7d... woff swap
Size 41 KB
Load time 212 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GT-America-Mono-Bold-5c... woff2 swap
Size 36 KB
Load time 280 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold-c5f1403... woff2 swap
Size 33 KB
Load time 247 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
GT-Sectra-Fine-Bold-23b... woff2 swap
Size 70 KB
Load time 427 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold-a239fb9... woff swap
Size 41 KB
Load time 390 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
PublicSans-ExtraBold-06... woff2 swap
Size 30 KB
Load time 317 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)

Fixing the unchecked items could save ~25 KB and ~50 ms

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+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
A+
JavaScript Blocking
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Network Waterfall
62 requests over 2690ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.9 s LCP 6.4 shttps://cia.gov// https://cia.gov/ — 301 — 728 B — 301 ms — http/1.1https://www.cia.gov/www.cia.gov/ https://www.cia.gov/ — 200 — 94.5 KiB — 511 ms — http/1.1https://www.cia.gov/js2/pubkey.jswww.cia.gov/js2/pubkey.js https://www.cia.gov/js2/pubkey.js — 200 — 1.1 KiB — 161 ms — http/1.1https://www.cia.gov/js2/verification.jswww.cia.gov/js2/verification.js https://www.cia.gov/js2/verification.js — 200 — 29.7 KiB — 279 ms — http/1.1https://www.cia.gov/manifest.webmanifestwww.cia.gov/manifest.webmanifest https://www.cia.gov/manifest.webmanifest — 200 — 1.3 KiB — 295 ms — http/1.1https://www.cia.gov/static/Freedom250seal_Gold-New.svgwww.cia.gov/static/Freedom250seal_G... https://www.cia.gov/static/Freedom250seal_Gold-New.svg — 200 — 22.0 KiB — 353 ms — http/1.1https://www.cia.gov/?mode=rawwww.cia.gov/?mode=raw https://www.cia.gov/?mode=raw — 200 — 94.2 KiB — 179 ms — http/1.1https://www.cia.gov/webpack-runtime-dcbe50b31e76953ec6aa.jswww.cia.gov/webpack-runtime-dcbe50b... https://www.cia.gov/webpack-runtime-dcbe50b31e76953ec6aa.js — 200 — 3.2 KiB — 116 ms — http/1.1https://www.cia.gov/framework-481beeb6bc5ccc2a4757.jswww.cia.gov/framework-481beeb6bc5cc... https://www.cia.gov/framework-481beeb6bc5ccc2a4757.js — 200 — 45.2 KiB — 236 ms — http/1.1https://www.cia.gov/app-62ee185fab1316a9cd60.jswww.cia.gov/app-62ee185fab1316a9cd6... https://www.cia.gov/app-62ee185fab1316a9cd60.js — 200 — 27.9 KiB — 466 ms — http/1.1https://www.cia.gov/js2/languages.jswww.cia.gov/js2/languages.js https://www.cia.gov/js2/languages.js — 200 — 10.6 KiB — 480 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg%20height='1707'%20width='2560'%20xmlns='http://www.w3.org/2…www.w3.org/2… data:image/svg+xml;charset=utf-8,%3Csvg%20height='1707'%20width='2560'%20xmlns='http://www.w3.org/2… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20height='2000'%20width='3000'%20xmlns='http://www.w3.org/2…www.w3.org/2… data:image/svg+xml;charset=utf-8,%3Csvg%20height='2000'%20width='3000'%20xmlns='http://www.w3.org/2… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20height='504'%20width='504'%20xmlns='http://www.w3.org/200…www.w3.org/200… data:image/svg+xml;charset=utf-8,%3Csvg%20height='504'%20width='504'%20xmlns='http://www.w3.org/200… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20height='360'%20width='360'%20xmlns='http://www.w3.org/200…www.w3.org/200… data:image/svg+xml;charset=utf-8,%3Csvg%20height='360'%20width='360'%20xmlns='http://www.w3.org/200… — 200 — 0 B — 0 ms — datahttps://www.cia.gov/static/PublicSans-Light-05ff7d7149c9a6d61fc10c3842f14215.woffwww.cia.gov/static/PublicSans-Light... https://www.cia.gov/static/PublicSans-Light-05ff7d7149c9a6d61fc10c3842f14215.woff — 200 — 41.2 KiB — 212 ms — http/1.1https://www.cia.gov/static/GT-America-Mono-Bold-5cb65dbcadbc053b4803a3de9e5204a1.woff2www.cia.gov/static/GT-America-Mono-... https://www.cia.gov/static/GT-America-Mono-Bold-5cb65dbcadbc053b4803a3de9e5204a1.woff2 — 200 — 35.8 KiB — 280 ms — http/1.1https://www.cia.gov/static/PublicSans-Bold-c5f1403759929abd85bf95108c08b4ac.woff2www.cia.gov/static/PublicSans-Bold-... https://www.cia.gov/static/PublicSans-Bold-c5f1403759929abd85bf95108c08b4ac.woff2 — 200 — 33.5 KiB — 247 ms — http/1.1https://www.cia.gov/static/GT-Sectra-Fine-Bold-23b3344434247f9eb8cabd9f5e923ee3.woff2www.cia.gov/static/GT-Sectra-Fine-B... https://www.cia.gov/static/GT-Sectra-Fine-Bold-23b3344434247f9eb8cabd9f5e923ee3.woff2 — 200 — 69.7 KiB — 427 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg%20height='3328'%20width='4992'%20xmlns='http://www.w3.org/2…www.w3.org/2… data:image/svg+xml;charset=utf-8,%3Csvg%20height='3328'%20width='4992'%20xmlns='http://www.w3.org/2… — 200 — 0 B — 0 ms — datahttps://www.cia.gov/static/PublicSans-Bold-a239fb971af47134c0c330b3d38f8288.woffwww.cia.gov/static/PublicSans-Bold-... https://www.cia.gov/static/PublicSans-Bold-a239fb971af47134c0c330b3d38f8288.woff — 200 — 41.4 KiB — 390 ms — http/1.1https://www.cia.gov/static/PublicSans-ExtraBold-06e2dc3ec7db555110e527b86b93d913.woff2www.cia.gov/static/PublicSans-Extra... https://www.cia.gov/static/PublicSans-ExtraBold-06e2dc3ec7db555110e527b86b93d913.woff2 — 200 — 30.2 KiB — 317 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg%20height='2661'%20width='2661'%20xmlns='http://www.w3.org/2…www.w3.org/2… data:image/svg+xml;charset=utf-8,%3Csvg%20height='2661'%20width='2661'%20xmlns='http://www.w3.org/2… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20height='1500'%20width='1500'%20xmlns='http://www.w3.org/2…www.w3.org/2… data:image/svg+xml;charset=utf-8,%3Csvg%20height='1500'%20width='1500'%20xmlns='http://www.w3.org/2… — 200 — 0 B — 0 ms — datahttps://www.cia.gov/static/67fda24b743cedfd66408e04eebe4656/828a3/hero-OHB-flowers.webpwww.cia.gov/static/67fda24b743cedfd... https://www.cia.gov/static/67fda24b743cedfd66408e04eebe4656/828a3/hero-OHB-flowers.webp — 200 — 91.4 KiB — 389 ms — http/1.1https://www.cia.gov/static/cef0bf6bbf4826dc5e9aaddbbff9d990/2ad07/Glyphs_Mission_Positive.webpwww.cia.gov/static/cef0bf6bbf4826dc... https://www.cia.gov/static/cef0bf6bbf4826dc5e9aaddbbff9d990/2ad07/Glyphs_Mission_Positive.webp — 200 — 10.7 KiB — 284 ms — http/1.1https://www.cia.gov/static/45ea7dd1005ab17954c801e9575bb7ae/41aff/ohb.jpgwww.cia.gov/static/45ea7dd1005ab179... https://www.cia.gov/static/45ea7dd1005ab17954c801e9575bb7ae/41aff/ohb.jpg — 200 — 1.0 MiB — 410 ms — http/1.1https://www.cia.gov/static/19d99e5def8deaaf9b036d799503ad9d/e4d88/e-st-hq.pngwww.cia.gov/static/19d99e5def8deaaf... https://www.cia.gov/static/19d99e5def8deaaf9b036d799503ad9d/e4d88/e-st-hq.png — 200 — 124.1 KiB — 278 ms — http/1.1https://www.cia.gov/static/90990c1a7a5072bc788f222e6bf28fb8/34e0f/ask-molly-card.jpgwww.cia.gov/static/90990c1a7a5072bc... https://www.cia.gov/static/90990c1a7a5072bc788f222e6bf28fb8/34e0f/ask-molly-card.jpg — 200 — 72.5 KiB — 188 ms — http/1.1https://www.cia.gov/static/917276a01d7635dcd400116220c736e3/34e0f/Stories-The-Real-Star-Wars-A-Cosmic-Race-and-A-Spacecraft-Heistwebtile.jpgwww.cia.gov/static/917276a01d7635dc... https://www.cia.gov/static/917276a01d7635dcd400116220c736e3/34e0f/Stories-The-Real-Star-Wars-A-Cosmic-Race-and-A-Spacecraft-Heistwebtile.jpg — 200 — 81.9 KiB — 153 ms — http/1.1
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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
71% of JavaScript execution is third-party
First-party Third-party 2189ms · 267KB · $29/mo
www.cia.gov
Other
Costly
Execution 1293ms
Transfer 94 KB
Monthly Cost $17/mo
www.cia.gov
Other
Costly
Execution 443ms
Transfer 45 KB
Monthly Cost $6/mo
www.cia.gov
Other
Costly
Execution 237ms
Transfer 28 KB
Monthly Cost $3/mo
www.cia.gov
Other
Costly
Execution 216ms
Transfer 99 KB
Unused 62%
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • www.cia.gov adds 1293ms and costs ~$17/month
  • www.cia.gov adds 443ms and costs ~$6/month
  • www.cia.gov adds 237ms and costs ~$3/month
  • www.cia.gov adds 216ms and costs ~$3/month

71% 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.cia.gov takes 1293ms 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.cia.gov takes 443ms 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.cia.gov takes 237ms 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.cia.gov takes 216ms 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 www.cia.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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