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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
7
PASS
8
INFO
3

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

Mobile Desktop
72
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

1.32 s

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

4.66 s

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

0 ms

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

0.001

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

1.74 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

4.76 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
22
8 PASS 7 REVIEW 4 FIX
F
Page Weight Budget
Action
5.2 MB transferred, 84 requests
FIX
5.2 MB transferred, 84 requests
Critical::
Page weighs 7.9 MB (5.2 MB transferred)
Warning::
Images are 3.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.6 MB
Info::
Fonts are 1.0 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.0 MB
Info::
84 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.2 MB / 2.4 MB budget
5.2 MB transferred
84 requests
1.1 g CO2 per page load
Images 3.6 MiB 69%
Fonts 1.0 MiB 20%
JavaScript 424.9 KiB 8%
CSS 156.5 KiB 3%
HTML 22.4 KiB 0%
Other 6.1 KiB 0%
Other 547 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

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 (5.2 MiB of 5.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
84 resources · 5.2 MB · 124 KB savings available
FIX
84 resources · 5.2 MB · 124 KB savings available
Warning::
Page weight 5.2 MB exceeds 1 MB target by 4.2 MB
Got: 5.2 MB Expected: ≤ 1 MB
Info::
~124 KB of savings available
Warning::
83 third-party resources (100% of weight)
Info::
3 resources over 200KB
84 resources · 5.2 MiB · 83 third-party 4.2 MiB over 1MB target
Image 69% · 3.6 MiB
Font 20% · 1.0 MiB
JavaScript 8% · 424.9 KiB
CSS 3% · 156.5 KiB
Document 0% · 22.4 KiB
Other 0% · 633 B

~123.7 KiB of savings available

Remove unused JavaScript: 123.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://www.nsa.gov/portals/75/Homepage/mission_ic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nsa.gov/portals/75/Homepage/ncm_logo.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nsa.gov/portals/75/Homepage/book.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nsa.gov/portals/75/Homepage/business.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nsa.gov/DesktopModules/SharedLibrary/I... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nsa.gov/Portals/75/logos.png?ver=EYzGy... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nsa.gov/portals/75/Homepage/lightbulb.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 3.6 MB
0 oversized -0 KB
15 legacy format
7 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

B
JS Bundles
27 scripts, 124 KB unused
REVIEW
27 scripts, 124 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nsa.gov/Resources/libraries/jQuery-UI/...: 59 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 124 KB
124 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L152 KB65 KB (43%)✓3rd
https://www.nsa.gov/Resources/libraries/jQuery-UI/01_13_03/jquery-ui.min.js?cdv=485567 KB59 KB (89%)✓3rd
https://www.nsa.gov/js/dnn.modalpopup.js?cdv=48554 KB—✓3rd
https://www.nsa.gov/DesktopModules/SharedLibrary/ValidatedPlugins/dompurify//purify.min.js?cdv=48559 KB—✓3rd
https://www.nsa.gov/Resources/libraries/HoverIntent/01_10_01/jquery.hoverIntent.min.js?cdv=48552 KB—✓3rd
https://www.nsa.gov/Portals/75/Homepage/wow.js5 KB—✓3rd
https://www.nsa.gov/Desktopmodules/SharedLibrary/Plugins/GoogleAnalytics/Universal-Federated-Analytics-8.7.js?agency=DOD&subagency=NSA&sitetopic=dma.web&dclink=true17 KB—✗3rd
https://www.nsa.gov/WebResource.axd?d=pynGkmcFUV0JwCJq02pBM5hu37VK52ATsgnYFxg-XxWGX0LYJ3mbwraaWwM1&t=6389016277208987735 KB—✓3rd
https://www.nsa.gov/ScriptResource.axd?d=NJmAwtEo3IrZZmhJbgLN7n1FwhuTJbajvmySO9QBr6i6zzzRyl6QF-8j0H4S-sD0hixqDz0d-Vujdi3MvDRr6hXBsdDKcKa7NksbEQY7g6k3ZSEstlgnEP2q9p_Nl5yEr2VDGw2&t=32e5dfca26 KB—✓3rd
https://www.nsa.gov/ScriptResource.axd?d=dwY9oWetJoIvUjxxH4p9bCJMmUDv-qgwxoAeD0W0JDFhvrbEUP41TpnqX4tfMCTuBVtMAY5BK7CMtCDqlACCH4GKtxFEd7YXvMw-KQEYwFXFhcauGEnIF2TD_CxRkDQLLPMbFuQe5XPVhKch0&t=32e5dfca10 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

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+
JS Execution Cost
373ms total JS execution
PASS
373ms total JS execution
Info::
https://www.nsa.gov/: 174ms CPU time
Info::
Unattributable: 119ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 81ms CPU time
Warning::
Third-party scripts: 255ms (68% of total)

Main Thread Breakdown

Other 31% Script Evaluation 29% Style & Layout 22% Script Parsing & Compilation 7% Parse HTML & CSS 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.nsa.gov/174ms4ms3ms3rd
Unattributable119ms2ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L81ms68ms12ms3rd
A+
Font Loading
10 fonts (1054 KB)
PASS
10 fonts (1054 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

1054 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.3 s LCP 4.7 shttps://www.nsa.gov/Portals/75/Fonts/Roboto-Thin.ttfRoboto-Thin.ttf https://www.nsa.gov/Portals/75/Fonts/Roboto-Thin.ttf — 85.1 KiB — 23 ms — font-display: swaphttps://www.nsa.gov/Desktopmodules/SharedLibrary/ValidatedPlugins/font-awesome6/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.nsa.gov/Desktopmodules/SharedLibrary/ValidatedPlugins/font-awesome6/webfonts/fa-solid-900.woff2 — 147.0 KiB — 62 ms — font-display: swaphttps://www.nsa.gov/Portals/75/Fonts/Roboto-Light.ttfRoboto-Light.ttf https://www.nsa.gov/Portals/75/Fonts/Roboto-Light.ttf — 86.5 KiB — 23 ms — font-display: swaphttps://www.nsa.gov/Portals/75/Fonts/Teko-Bold.ttfTeko-Bold.ttf https://www.nsa.gov/Portals/75/Fonts/Teko-Bold.ttf — 109.9 KiB — 34 ms — font-display: swaphttps://www.nsa.gov/Portals/75/Fonts/Teko-Medium.ttfTeko-Medium.ttf https://www.nsa.gov/Portals/75/Fonts/Teko-Medium.ttf — 113.9 KiB — 23 ms — font-display: swaphttps://www.nsa.gov/Portals/75/Fonts/Teko-SemiBold.ttfTeko-SemiBold.ttf https://www.nsa.gov/Portals/75/Fonts/Teko-SemiBold.ttf — 115.7 KiB — 144 ms — font-display: swaphttps://www.nsa.gov/Portals/75/Fonts/Teko-Regular.ttfTeko-Regular.ttf https://www.nsa.gov/Portals/75/Fonts/Teko-Regular.ttf — 113.6 KiB — 51 ms — font-display: swaphttps://www.nsa.gov/Portals/75/Fonts/Roboto-Bold.ttfRoboto-Bold.ttf https://www.nsa.gov/Portals/75/Fonts/Roboto-Bold.ttf — 87.1 KiB — 62 ms — font-display: swaphttps://www.nsa.gov/Portals/75/Fonts/Roboto-Black.ttfRoboto-Black.ttf https://www.nsa.gov/Portals/75/Fonts/Roboto-Black.ttf — 87.5 KiB — 38 ms — font-display: swaphttps://www.nsa.gov/Desktopmodules/SharedLibrary/ValidatedPlugins/font-awesome6/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.nsa.gov/Desktopmodules/SharedLibrary/ValidatedPlugins/font-awesome6/webfonts/fa-brands-400.woff2 — 107.8 KiB — 17 ms — font-display: swap
Roboto-Thin.ttf ttf swap
Size 85 KB
Load time 23 ms
Start 942 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-solid-900.woff2 woff2 swap
Size 147 KB
Load time 62 ms
Start 942 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Roboto-Light.ttf ttf swap
Size 86 KB
Load time 23 ms
Start 943 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Teko-Bold.ttf ttf swap
Size 110 KB
Load time 34 ms
Start 943 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Teko-Medium.ttf ttf swap
Size 114 KB
Load time 23 ms
Start 943 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Teko-SemiBold.ttf ttf swap
Size 116 KB
Load time 144 ms
Start 945 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Teko-Regular.ttf ttf swap
Size 114 KB
Load time 51 ms
Start 946 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Roboto-Bold.ttf ttf swap
Size 87 KB
Load time 62 ms
Start 946 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Roboto-Black.ttf ttf swap
Size 87 KB
Load time 38 ms
Start 971 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-brands-400.woff2 woff2 swap
Size 108 KB
Load time 17 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~594 KB and ~1188 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.
Network Waterfall
84 requests over 2046ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.3 s LCP 4.7 shttps://nsa.gov// https://nsa.gov/ — 301 — 86 B — 85 ms — h2https://www.nsa.gov/www.nsa.gov/ https://www.nsa.gov/ — 200 — 22.4 KiB — 59 ms — http/1.1https://www.nsa.gov/Portals/75/Homepage/animate.csswww.nsa.gov/Portals/75/Homepage/ani... https://www.nsa.gov/Portals/75/Homepage/animate.css — 200 — 6.4 KiB — 26 ms — http/1.1https://use.fontawesome.com/releases/latest/js/all.jsuse.fontawesome.com/releases/latest... https://use.fontawesome.com/releases/latest/js/all.js — 404 — 435 B — 101 ms — h2https://www.nsa.gov/Resources/Shared/stylesheets/dnndefault/7.0.0/default.css?cdv=4855www.nsa.gov/Resources/Shared/styles... https://www.nsa.gov/Resources/Shared/stylesheets/dnndefault/7.0.0/default.css?cdv=4855 — 200 — 16.8 KiB — 47 ms — http/1.1https://www.nsa.gov/DesktopModules/HotInfo/module.css?cdv=4855www.nsa.gov/DesktopModules/HotInfo/... https://www.nsa.gov/DesktopModules/HotInfo/module.css?cdv=4855 — 200 — 1.2 KiB — 40 ms — http/1.1https://www.nsa.gov/DesktopModules/PhotoDashboard/module.css?cdv=4855www.nsa.gov/DesktopModules/PhotoDas... https://www.nsa.gov/DesktopModules/PhotoDashboard/module.css?cdv=4855 — 200 — 915 B — 39 ms — http/1.1https://www.nsa.gov/DesktopModules/Announcements/module.css?cdv=4855www.nsa.gov/DesktopModules/Announce... https://www.nsa.gov/DesktopModules/Announcements/module.css?cdv=4855 — 200 — 777 B — 38 ms — http/1.1https://www.nsa.gov/DesktopModules/ArticleCSDashboard/module.css?cdv=4855www.nsa.gov/DesktopModules/ArticleC... https://www.nsa.gov/DesktopModules/ArticleCSDashboard/module.css?cdv=4855 — 200 — 12.8 KiB — 38 ms — http/1.1https://www.nsa.gov/DesktopModules/AccordionMenu/CSS/jumpMenu.css?cdv=4855www.nsa.gov/DesktopModules/Accordio... https://www.nsa.gov/DesktopModules/AccordionMenu/CSS/jumpMenu.css?cdv=4855 — 200 — 883 B — 47 ms — http/1.1https://www.nsa.gov/DesktopModules/AccordionMenu/CSS/Templates/dod.css?cdv=4855www.nsa.gov/DesktopModules/Accordio... https://www.nsa.gov/DesktopModules/AccordionMenu/CSS/Templates/dod.css?cdv=4855 — 200 — 1.5 KiB — 79 ms — http/1.1https://www.nsa.gov/Desktopmodules/SharedLibrary/Plugins/Bootstrap/css/bootstrap.min.css?cdv=4855www.nsa.gov/Desktopmodules/SharedLi... https://www.nsa.gov/Desktopmodules/SharedLibrary/Plugins/Bootstrap/css/bootstrap.min.css?cdv=4855 — 200 — 19.8 KiB — 63 ms — http/1.1https://www.nsa.gov/Portals/_default/skins/dod2/skin.css?cdv=4855www.nsa.gov/Portals/_default/skins/... https://www.nsa.gov/Portals/_default/skins/dod2/skin.css?cdv=4855 — 200 — 10.5 KiB — 48 ms — http/1.1https://www.nsa.gov/Portals/_default/Containers/DOD2/container.css?cdv=4855www.nsa.gov/Portals/_default/Contai... https://www.nsa.gov/Portals/_default/Containers/DOD2/container.css?cdv=4855 — 200 — 1.3 KiB — 49 ms — http/1.1https://www.nsa.gov/Portals/75/portal.css?cdv=4855www.nsa.gov/Portals/75/portal.css?c... https://www.nsa.gov/Portals/75/portal.css?cdv=4855 — 200 — 13.9 KiB — 56 ms — 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https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je6781v9131934939za200zd9131934939&_p=1783716543537&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=863199097.1783716545&frm=0&ngs=1&pscdl=noapi&rcb=2&sr=800x600&uaa=x86&uab=64&uafvl=Not%253BA%253DBrand%3B8.0.0.0%7CChromium%3B150.0.7871.100&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=115938465~115938469~118395333~118826210~118897920~118897930~119027224&dl=https%3A%2F%2Fnsa.gov%2F&dt=National%20Security%20Agency%20%7C%20Central%20Security%20Service&dr=&sid=1783716544&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&ep.agency=DOD&ep.subagency=NSA&ep.site_topic=dma.web&ep.site_platform=unspecified%3Ansa.gov&ep.script_source=https%3A%2F%2Fnsa.gov%2Fdesktopmodules%2Fsharedlibrary%2Fplugins%2Fgoogleanalytics%2Funiversal-federated-analytics-8.7.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=nsa.gov&tfd=1945 — 204 — 547 B — 99 ms — h2https://www.nsa.gov/Portals/75/favicon.ico?ver=qRajspwcTqAKByf9rmRnPg%3d%3dwww.nsa.gov/Portals/75/favicon.ico?... https://www.nsa.gov/Portals/75/favicon.ico?ver=qRajspwcTqAKByf9rmRnPg%3d%3d — 200 — 6.0 KiB — 31 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
68% of JavaScript execution is third-party
First-party Third-party 255ms · 174KB · $4/mo
www.nsa.gov
Other
Optional
Execution 174ms
Transfer 22 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 152 KB
Unused 43%
Monthly Cost $1/mo

68% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

How third-party costs are calculated

Image Optimization
7 images, 96 KB total, 43 KB wasted
INFO

Image Optimization Audit

Total Images

7

Total Size

96 KB

Oversized

1

Wasted

43 KB

7 missing dimensions 6 missing lazy loading
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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