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https://fbi.gov

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
5
PASS
9
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.
79
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.
61
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.

1.49 s

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

3.36 s

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

18 ms

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

0.006

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

2.32 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.

3.72 s

Page Load Progression

581 ms
1.2 s
1.7 s
2.3 s
2.9 s
3.5 s
4.1 s
4.6 s
Checks
22
9 PASS 5 REVIEW 5 FIX
F
Page Weight Budget
Action
9.4 MB transferred, 97 requests
FIX
9.4 MB transferred, 97 requests
Critical::
Page weighs 12.5 MB (9.4 MB transferred)
Warning::
Images are 4.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.1 MB
Warning::
JavaScript is 911 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 911 KB
Info::
Fonts are 576 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 576 KB
Info::
CSS is 294 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 294 KB
Info::
97 HTTP requests
Info::
Estimated 2.0 g CO2 per page load
9.4 MB / 2.4 MB budget
9.4 MB transferred
97 requests
2.0 g CO2 per page load
Images 4.1 MiB 44%
Other 3.5 MiB 37%
JavaScript 910.5 KiB 9%
Fonts 576.2 KiB 6%
CSS 293.9 KiB 3%
HTML 16.1 KiB 0%
Other 2.6 KiB 0%
Other 2.1 KiB 0%
Other 837 B 0%
Other 555 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

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

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

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 (9.4 MiB of 9.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
12 scripts, 498 KB unused
FIX
12 scripts, 498 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...: 109 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DBEM...: 68 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
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.fbi.gov/++plone++castle-advantage/libs...: 39 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 498 KB
498 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.fbi.gov/++plone++production/++unique++2026-07-07T20:39:40.431302/default.js341 KB217 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e6781151 KB109 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DBEM2FVVRF175 KB68 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L149 KB65 KB (43%)✓3rd
https://www.fbi.gov/++plone++castle-advantage/libs/audioplayer/audioplayer.js60 KB39 KB (66%)✓3rd
https://www.fbi.gov/++theme++2026-06-02-theme/++theme++fbigov.theme/directors-theme/js/main.js3 KB—✓3rd
https://www.fbi.gov/++theme++fbigov.theme/fragments/header.js1 KB—✓3rd
https://www.fbi.gov/++theme++fbigov.theme/directors-theme/js/main.js3 KB—✓3rd
https://www.fbi.gov/++theme++fbigov.theme/directors-theme/js/social-carousel.js1 KB—✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOJ&subagency=FBI9 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
97 resources · 9.4 MB · 498 KB savings available
FIX
97 resources · 9.4 MB · 498 KB savings available
Warning::
Page weight 9.4 MB exceeds 1 MB target by 8.4 MB
Got: 9.4 MB Expected: ≤ 1 MB
Info::
~498 KB of savings available
Warning::
96 third-party resources (100% of weight)
Info::
10 resources over 200KB
97 resources · 9.4 MiB · 96 third-party 8.4 MiB over 1MB target
Image 44% · 4.1 MiB
Media 37% · 3.5 MiB
JavaScript 9% · 910.5 KiB
Font 6% · 576.2 KiB
CSS 3% · 293.9 KiB
Document 0% · 16.6 KiB
Other 0% · 4.5 KiB

~498.4 KiB of savings available

Remove unused JavaScript: 498.4 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
50 images, 0 KB saveable
REVIEW
50 images, 0 KB saveable
Warning::
https://www.fbi.gov/fbi-homepage/law-enforcement-o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/ten-most-wanted-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/ten-most-wanted-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++fbigov.theme/director... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/reported-hate-cri... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/ten-most-wanted-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/drop-in-murder-an... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/ten-most-wanted-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/ten-most-wanted-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/ten-most-wanted-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/ten-most-wanted-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/++theme++fbigov.theme/director... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/decrease-in-overa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/ten-most-wanted-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/fentanyl-seized.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.fbi.gov/fbi-homepage/total-criminal-of... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
50 images 4.1 MB
0 oversized -0 KB
6 legacy format
16 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

C
JS Execution Cost
Action
1041ms total JS execution
REVIEW
1041ms total JS execution
Warning::
Unattributable: 272ms CPU time
Info::
https://www.fbi.gov/: 195ms CPU time
Info::
https://www.fbi.gov/++plone++production/++unique++...: 184ms CPU time
Info::
https://www.fbi.gov/++theme++fbigov.theme/director...: 151ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-DBEM...: 87ms CPU time
Warning::
Third-party scripts: 769ms (74% of total)

Main Thread Breakdown

Script Evaluation 36% Other 27% Style & Layout 24% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
Unattributable272ms3ms0ms1st
https://www.fbi.gov/195ms12ms1ms3rd
https://www.fbi.gov/++plone++production/++unique++2026-07-07T20:39:40.431302/default.js184ms127ms34ms3rd
https://www.fbi.gov/++theme++fbigov.theme/directors-theme/js/main.js151ms4ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DBEM2FVVRF87ms74ms12ms3rd
https://www.fbi.gov/cdn-cgi/challenge-platform/scripts/jsd/main.js86ms83ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L65ms53ms12ms3rd
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.
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
7 fonts (576 KB)
PASS
7 fonts (576 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

576 KB total

Render-blocking

0

of 7

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 FCP 1.5 s LCP 3.4 shttps://fonts.gstatic.com/s/rajdhani/v17/LDI2apCSOBg7S-QT7pbYF_OreefkkbIx.woff2LDI2apCSOBg7S-QT7pbYF_O... https://fonts.gstatic.com/s/rajdhani/v17/LDI2apCSOBg7S-QT7pbYF_OreefkkbIx.woff2 — 9.2 KiB — 129 ms — font-display: swaphttps://fonts.gstatic.com/s/rajdhani/v17/LDI2apCSOBg7S-QT7pa8FvOreefkkbIx.woff2LDI2apCSOBg7S-QT7pa8FvO... https://fonts.gstatic.com/s/rajdhani/v17/LDI2apCSOBg7S-QT7pa8FvOreefkkbIx.woff2 — 9.1 KiB — 150 ms — font-display: swaphttps://fonts.gstatic.com/s/rajdhani/v17/LDI2apCSOBg7S-QT7pb0EPOreefkkbIx.woff2LDI2apCSOBg7S-QT7pb0EPO... https://fonts.gstatic.com/s/rajdhani/v17/LDI2apCSOBg7S-QT7pb0EPOreefkkbIx.woff2 — 8.8 KiB — 257 ms — font-display: swaphttps://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/fonts/bootstrap-icons.woff2?dd67030699838ea613ee6dbda90effa6bootstrap-icons.woff2 https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/fonts/bootstrap-icons.woff2?dd67030699838ea613ee6dbda90effa6 — 128.1 KiB — 102 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 323 ms — font-display: swaphttps://fonts.gstatic.com/s/rajdhani/v17/LDIxapCSOBg7S-QT7p4HM-aGW-rO.woff2LDIxapCSOBg7S-QT7p4HM-a... https://fonts.gstatic.com/s/rajdhani/v17/LDIxapCSOBg7S-QT7p4HM-aGW-rO.woff2 — 8.8 KiB — 219 ms — font-display: swaphttps://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/fonts/Rajdhani/Rajdhani-Bold.ttfRajdhani-Bold.ttf https://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/fonts/Rajdhani/Rajdhani-Bold.ttf — 364.8 KiB — 91 ms — font-display: swap
LDI2apCSOBg7S-QT7pbYF_O... woff2 swap
Size 9 KB
Load time 129 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
LDI2apCSOBg7S-QT7pa8FvO... woff2 swap
Size 9 KB
Load time 150 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
LDI2apCSOBg7S-QT7pb0EPO... woff2 swap
Size 9 KB
Load time 257 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
bootstrap-icons.woff2 woff2 swap
Size 128 KB
Load time 102 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
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 323 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
LDIxapCSOBg7S-QT7p4HM-a... woff2 swap
Size 9 KB
Load time 219 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
Rajdhani-Bold.ttf ttf swap
Size 365 KB
Load time 91 ms
Start 1.2 s
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 ~356 KB and ~712 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+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
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
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: accept-encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
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+
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
97 requests over 2856ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.5 s LCP 3.4 shttps://fbi.gov// https://fbi.gov/ — 301 — 588 B — 64 ms — h2https://www.fbi.gov/www.fbi.gov/ https://www.fbi.gov/ — 200 — 16.1 KiB — 359 ms — h3https://www.fbi.gov/++plone++production/++unique++2026-07-07T20:39:40.431302/default.csswww.fbi.gov/++plone++production/++u... https://www.fbi.gov/++plone++production/++unique++2026-07-07T20:39:40.431302/default.css — 200 — 216.5 KiB — 125 ms — h3https://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/css/uswds-header.csswww.fbi.gov/++theme++2026-06-02-the... https://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/css/uswds-header.css — 200 — 1.5 KiB — 51 ms — h3https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Rajdhani:wght@600;700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Rajdhani:wght@600;700&display=swap — 200 — 1.4 KiB — 622 ms — h2https://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/css/vendored/bootstrap.min.csswww.fbi.gov/++theme++2026-06-02-the... https://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/css/vendored/bootstrap.min.css — 200 — 32.7 KiB — 125 ms — h3https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.csscdn.jsdelivr.net/npm/bootstrap-icon... https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css — 200 — 13.8 KiB — 70 ms — h2https://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/css/styles.csswww.fbi.gov/++theme++2026-06-02-the... https://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/css/styles.css — 200 — 9.2 KiB — 133 ms — h3https://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/css/subpage-navbar.csswww.fbi.gov/++theme++2026-06-02-the... https://www.fbi.gov/++theme++2026-06-02-theme/directors-theme/css/subpage-navbar.css — 200 — 3.5 KiB — 70 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
74% of JavaScript execution is third-party
First-party Third-party 769ms · 686KB · $10/mo
www.fbi.gov
Other
Optional
Execution 195ms
Transfer 16 KB
Monthly Cost $3/mo
www.fbi.gov
Other
Optional
Execution 184ms
Transfer 341 KB
Unused 65%
Monthly Cost $2/mo
www.fbi.gov
Other
Optional
Execution 151ms
Transfer 3 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 87ms
Transfer 175 KB
Unused 39%
Monthly Cost $1/mo
www.fbi.gov
Other
Optional
Execution 86ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 149 KB
Unused 43%
Monthly Cost $1/mo

74% 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

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

Image Optimization
1 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

0 KB

1 missing dimensions 1 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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