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https://fbi.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
77
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

2.83 s

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

5.06 s

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

42 ms

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

0.013

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

2.83 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.

5.67 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
15
6 PASS 2 REVIEW 5 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 920 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 920 KB
Info::
CSS is 377 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 377 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 45%
Fonts 2.4 MiB 36%
JavaScript 919.8 KiB 13%
CSS 377.1 KiB 5%
HTML 10.5 KiB 0%
Other 2.5 KiB 0%
Other 1.9 KiB 0%
Other 837 B 0%
Other 556 B 0%
Other 555 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
D
JS Bundles
Action
10 scripts, 460 KB unused
FIX
10 scripts, 460 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-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.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DBEM...: 35 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 460 KB
460 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-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://www.fbi.gov/++plone++castle-advantage/libs/audioplayer/audioplayer.js60 KB39 KB (66%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DBEM2FVVRF172 KB35 KB (38%)✓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?13 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 · 460 KB savings available
FIX
64 resources · 6.7 MB · 460 KB savings available
Warning::
Page weight 5.7 MB over 1MB target
Got: 6.7 MB Expected: ≤ 1 MB
Info::
~460 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% · 919.8 KiB
CSS 5% · 377.1 KiB
Document 0% · 10.5 KiB
Other 0% · 4.8 KiB

~460.2 KiB of savings available

Remove unused JavaScript: 460.2 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.

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

C
JS Execution Cost
Action
1017ms total JS execution
REVIEW
1017ms total JS execution
Info::
https://www.fbi.gov/: 245ms CPU time
Info::
https://www.fbi.gov/++plone++production/++unique++...: 234ms CPU time
Info::
Unattributable: 196ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-DBEM...: 129ms CPU time
Info::
https://www.fbi.gov/cdn-cgi/challenge-platform/scr...: 116ms CPU time
Warning::
Third-party scripts: 1017ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 18% Style & Layout 14% Script Parsing & Compilation 11% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.fbi.gov/245ms28ms2ms3rd
https://www.fbi.gov/++plone++production/++unique++2025-08-18T20:53:28.626929/default.js234ms166ms57ms3rd
Unattributable196ms3ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DBEM2FVVRF129ms103ms24ms3rd
https://www.fbi.gov/cdn-cgi/challenge-platform/scripts/jsd/main.js116ms110ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L97ms79ms17ms3rd
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.8 s LCP 5.1 shttps://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 — 57 ms — font-display: swaphttps://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 — 61 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 — 77 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 — 95 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 — 146 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 — 160 ms — font-display: swap
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 57 ms
Start 630 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
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 61 ms
Start 630 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 77 ms
Start 630 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-Bold.ttf ttf swap
Size 365 KB
Load time 95 ms
Start 631 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 146 ms
Start 631 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 160 ms
Start 632 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+
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 1532ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.8 s LCP 5.1 shttps://fbi.gov// https://fbi.gov/ — 301 — 553 B — 39 ms — h2https://www.fbi.gov/www.fbi.gov/ https://www.fbi.gov/ — 200 — 10.5 KiB — 250 ms — h2https://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 — 143 ms — h2https://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 — 35.9 KiB — 77 ms — h2https://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 — 369 B — 72 ms — h2https://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 — 32.4 KiB — 83 ms — h2https://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 — 21.7 KiB — 76 ms — h2https://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 — 3.2 KiB — 72 ms — h2https://www.fbi.gov/++plone++castle/less/public/print.csswww.fbi.gov/++plone++castle/less/pu... https://www.fbi.gov/++plone++castle/less/public/print.css — 200 — 923 B — 61 ms — h2https://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 — 498 B — 140 ms — h2https://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 — 562 B — 139 ms — h2https://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 — 38.0 KiB — 114 ms — h2https://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 — 132 ms — h2https://www.fbi.gov/++theme++2025-05-16/new-frontpage/img/most-wanted.jpgwww.fbi.gov/++theme++2025-05-16/new... https://www.fbi.gov/++theme++2025-05-16/new-frontpage/img/most-wanted.jpg — 200 — 1.1 MiB — 190 ms — 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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 1017ms · 672KB · $14/mo
www.fbi.gov
Other
Costly
Execution 245ms
Transfer 11 KB
Monthly Cost $3/mo
www.fbi.gov
Other
Costly
Execution 234ms
Transfer 341 KB
Unused 65%
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 196ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 129ms
Transfer 172 KB
Unused 38%
Monthly Cost $2/mo
www.fbi.gov
Other
Optional
Execution 116ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 97ms
Transfer 147 KB
Unused 43%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.fbi.gov adds 245ms and costs ~$3/month
  • www.fbi.gov adds 234ms 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.fbi.gov takes 245ms 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 234ms 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

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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