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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
44
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
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.
54
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.

18.95 s

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

33.41 s

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

438 ms

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

0.000

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

18.95 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.

34.23 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
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
6.7 MB transferred, 64 requests
FIX
6.7 MB transferred, 64 requests
Critical::
Page weighs 9.7 MB (6.7 MB transferred)
Warning::
Images are 3.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.0 MB
Info::
Fonts are 2.4 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 2.4 MB
Warning::
JavaScript is 921 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 921 KB
Info::
CSS is 379 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 379 KB
Info::
64 HTTP requests
Info::
Estimated 1.4 g CO2 per page load
6.7 MB / 2.4 MB budget
6.7 MB transferred
64 requests
1.4 g CO2 per page load
Images 3.0 MiB 44%
Fonts 2.4 MiB 36%
JavaScript 921.0 KiB 13%
CSS 378.6 KiB 6%
HTML 10.5 KiB 0%
Other 2.5 KiB 0%
Other 1.7 KiB 0%
Other 837 B 0%
Other 554 B 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

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

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 (6.7 MiB of 6.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4399ms total JS execution
FIX
4399ms total JS execution
Warning::
https://www.fbi.gov/++plone++production/++unique++...: 1132ms CPU time
Warning::
Unattributable: 821ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DBEM...: 534ms CPU time
Warning::
https://www.fbi.gov/: 534ms CPU time
Warning::
https://www.fbi.gov/cdn-cgi/challenge-platform/scr...: 401ms CPU time
Warning::
Third-party scripts: 4399ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 20% Script Parsing & Compilation 13% Style & Layout 10% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.fbi.gov/++plone++production/++unique++2025-08-18T20:53:28.626929/default.js1132ms672ms285ms3rd
Unattributable821ms13ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DBEM2FVVRF534ms437ms92ms3rd
https://www.fbi.gov/534ms71ms6ms3rd
https://www.fbi.gov/cdn-cgi/challenge-platform/scripts/jsd/main.js401ms383ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L354ms284ms68ms3rd
https://www.fbi.gov/++plone++castle-advantage/libs/audioplayer/audioplayer.js138ms78ms58ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js137ms131ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h197ms34ms62ms3rd
https://www.fbi.gov/++plone++production/++unique++2025-08-18T20:53:28.626929/default.css92ms0ms0ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
10 scripts, 490 KB unused
FIX
10 scripts, 490 KB unused
Warning::
https://www.fbi.gov/++plone++production/++unique++...: 217 KB unused (65%)
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-DBEM...: 65 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.fbi.gov/++plone++castle-advantage/libs...: 39 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 490 KB
490 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.fbi.gov/++plone++production/++unique++2025-08-18T20:53:28.626929/default.js341 KB217 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DBEM2FVVRF172 KB65 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://www.fbi.gov/++plone++castle-advantage/libs/audioplayer/audioplayer.js60 KB39 KB (66%)✓3rd
https://www.fbi.gov/++theme++2025-05-16/new-frontpage/bootstrap/js/bootstrap.bundle.min.js24 KB—✓3rd
https://www.fbi.gov/++theme++2025-05-16/new-frontpage/frontpage.js1 KB—✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOJ&subagency=FBI9 KB—✓3rd
https://www.fbi.gov/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?14 KB—✓3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js4 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
64 resources · 6.7 MB · 490 KB savings available
FIX
64 resources · 6.7 MB · 490 KB savings available
Warning::
Page weight 5.7 MB over 1MB target
Got: 6.7 MB Expected: ≤ 1 MB
Info::
~490 KB of savings available
Warning::
63 third-party resources (100% of weight)
Info::
8 resources over 200KB
64 resources · 6.7 MiB · 63 third-party 5.7 MiB over 1MB target
Image 45% · 3.0 MiB
Font 36% · 2.4 MiB
JavaScript 13% · 921.0 KiB
CSS 6% · 378.6 KiB
Document 0% · 10.5 KiB
Other 0% · 4.6 KiB

~489.9 KiB of savings available

Remove unused JavaScript: 489.9 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.

C
Image Optimization
Action
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++2025-05-16/new-frontp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 3.0 MB
0 oversized -0 KB
7 legacy format
20 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

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

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 (2500 KB)
PASS
6 fonts (2500 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

2500 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 30.0 s 32.0 s 34.0 s FCP 19.0 s LCP 33.4 shttps://www.fbi.gov/++theme++2025-05-16/new-frontpage/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fontawesome/webfonts/fa-solid-900.woff2 — 154.9 KiB — 181 ms — font-display: swaphttps://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts/Rajdhani/Rajdhani-Bold.ttfRajdhani-Bold.ttf https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts/Rajdhani/Rajdhani-Bold.ttf — 364.9 KiB — 203 ms — font-display: swaphttps://www.fbi.gov/++theme++2025-05-16/new-frontpage/fontawesome/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fontawesome/webfonts/fa-brands-400.woff2 — 116.3 KiB — 208 ms — font-display: swaphttps://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts/Rajdhani/Rajdhani-Medium.ttfRajdhani-Medium.ttf https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts/Rajdhani/Rajdhani-Medium.ttf — 349.9 KiB — 222 ms — font-display: swaphttps://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts/Source_Serif_4/SourceSerif4-VariableFont_opsz,wght.ttfSourceSerif4-VariableFo... https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts/Source_Serif_4/SourceSerif4-VariableFont_opsz,wght.ttf — 1.1 MiB — 257 ms — font-display: swaphttps://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts/Rajdhani/Rajdhani-Regular.ttfRajdhani-Regular.ttf https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts/Rajdhani/Rajdhani-Regular.ttf — 344.3 KiB — 269 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 181 ms
Start 712 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
Rajdhani-Bold.ttf ttf swap
Size 365 KB
Load time 203 ms
Start 712 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
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 208 ms
Start 713 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
Rajdhani-Medium.ttf ttf swap
Size 350 KB
Load time 222 ms
Start 713 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
SourceSerif4-VariableFo... ttf swap
Size 1169 KB
Load time 257 ms
Start 713 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
Rajdhani-Regular.ttf ttf swap
Size 344 KB
Load time 269 ms
Start 715 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
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 ~1918 KB and ~3836 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+
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
64 requests over 1524ms
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 FCP 19.0 s LCP 33.4 shttps://fbi.gov// https://fbi.gov/ — 301 — 556 B — 25 ms — h2https://www.fbi.gov/www.fbi.gov/ https://www.fbi.gov/ — 200 — 10.5 KiB — 205 ms — h3https://www.fbi.gov/++plone++production/++unique++2025-08-18T20:53:28.626929/default.csswww.fbi.gov/++plone++production/++u... https://www.fbi.gov/++plone++production/++unique++2025-08-18T20:53:28.626929/default.css — 200 — 282.5 KiB — 95 ms — h3https://www.fbi.gov/++theme++2025-05-16/css/index.csswww.fbi.gov/++theme++2025-05-16/css... https://www.fbi.gov/++theme++2025-05-16/css/index.css — 200 — 36.2 KiB — 89 ms — h3https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts.csswww.fbi.gov/++theme++2025-05-16/new... https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fonts.css — 200 — 620 B — 67 ms — h3https://www.fbi.gov/++theme++2025-05-16/new-frontpage/bootstrap/css/bootstrap.min.csswww.fbi.gov/++theme++2025-05-16/new... https://www.fbi.gov/++theme++2025-05-16/new-frontpage/bootstrap/css/bootstrap.min.css — 200 — 32.7 KiB — 116 ms — h3https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fontawesome/css/all.min.csswww.fbi.gov/++theme++2025-05-16/new... https://www.fbi.gov/++theme++2025-05-16/new-frontpage/fontawesome/css/all.min.css — 200 — 22.0 KiB — 97 ms — h3https://www.fbi.gov/++theme++2025-05-16/new-frontpage/styles.css?v=1.1www.fbi.gov/++theme++2025-05-16/new... https://www.fbi.gov/++theme++2025-05-16/new-frontpage/styles.css?v=1.1 — 200 — 3.5 KiB — 77 ms — h3https://www.fbi.gov/++theme++fbigov.theme/uswds-2.9.0/img/icon-dot-gov.svgwww.fbi.gov/++theme++fbigov.theme/u... https://www.fbi.gov/++theme++fbigov.theme/uswds-2.9.0/img/icon-dot-gov.svg — 200 — 758 B — 172 ms — h3https://www.fbi.gov/++theme++fbigov.theme/uswds-2.9.0/img/icon-https.svgwww.fbi.gov/++theme++fbigov.theme/u... https://www.fbi.gov/++theme++fbigov.theme/uswds-2.9.0/img/icon-https.svg — 200 — 716 B — 173 ms — h3https://www.fbi.gov/++theme++2025-05-16/new-frontpage/img/fbi-logo.pngwww.fbi.gov/++theme++2025-05-16/new... https://www.fbi.gov/++theme++2025-05-16/new-frontpage/img/fbi-logo.png — 200 — 38.2 KiB — 252 ms — h3https://www.fbi.gov/++theme++2025-05-16/new-frontpage/img/Kash-Patel---MISSION-STATEMENT.jpgwww.fbi.gov/++theme++2025-05-16/new... https://www.fbi.gov/++theme++2025-05-16/new-frontpage/img/Kash-Patel---MISSION-STATEMENT.jpg — 200 — 161.1 KiB — 120 ms — h3https://www.fbi.gov/++plone++production/++unique++2025-08-18T20:53:28.626929/default.jswww.fbi.gov/++plone++production/++u... https://www.fbi.gov/++plone++production/++unique++2025-08-18T20:53:28.626929/default.js — 200 — 341.0 KiB — 260 ms — 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https://region1.analytics.google.com/g/collect?v=2&tid=G-DBEM2FVVRF&gtm=45je64h1v875478076za200zd875478076&_p=1776799541726&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&are=1&cid=381327298.1776799542&frm=0&pscdl=noapi&rcb=19&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&gaf=2&_s=1&tag_exp=0~115938466~115938469~117266400~117884344&sid=1776799542&sct=1&seg=0&dl=https%3A%2F%2Fwww.fbi.gov%2F&dt=FBI%20%E2%80%94%20Federal%20Bureau%20of%20Investigation&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1160 — 204 — 547 B — 112 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-DBEM2FVVRF&cid=381327298.1776799542&gtm=45je64h1v875478076za200zd875478076&rcb=19&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266400~117884344stats.g.doubleclick.net/g/collect?v... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 4399ms · 1208KB · $58/mo
www.fbi.gov
Other
Costly
Execution 1132ms
Transfer 341 KB
Unused 65%
Monthly Cost $15/mo
Unattributable
Other
Costly
Execution 821ms
Transfer 0 KB
Monthly Cost $11/mo
Google Tag Manager
Tag Manager
Costly
Execution 534ms
Transfer 172 KB
Unused 38%
Monthly Cost $7/mo
www.fbi.gov
Other
Costly
Execution 534ms
Transfer 10 KB
Monthly Cost $7/mo
www.fbi.gov
Other
Costly
Execution 401ms
Transfer 0 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 354ms
Transfer 147 KB
Unused 43%
Monthly Cost $5/mo
www.fbi.gov
Other
Optional
Execution 138ms
Transfer 60 KB
Unused 66%
Monthly Cost $2/mo
dap.digitalgov.gov
Other
Optional
Execution 137ms
Transfer 4 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 97ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo
www.fbi.gov
Other
Optional
Execution 92ms
Transfer 282 KB
Monthly Cost $1/mo
www.fbi.gov
Other
Optional
Execution 84ms
Transfer 33 KB
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 74ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.fbi.gov adds 1132ms and costs ~$15/month
  • Unattributable adds 821ms and costs ~$11/month
  • Google Tag Manager adds 534ms and costs ~$7/month
  • www.fbi.gov adds 534ms and costs ~$7/month
  • www.fbi.gov adds 401ms and costs ~$5/month
  • Google Tag Manager adds 354ms and costs ~$5/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.fbi.gov takes 1132ms 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

65% of www.fbi.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

Unattributable takes 821ms 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 534ms 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.fbi.gov takes 534ms 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.fbi.gov takes 401ms 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 354ms 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

66% of www.fbi.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

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

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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