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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
6
REVIEW
5
PASS
12
INFO
3

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

Mobile Desktop
37
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
76
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.

8.07 s

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

24.19 s

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

816 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.

8.74 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.

25.53 s

Page Load Progression

675 ms
1.4 s
2.0 s
2.7 s
3.4 s
4.0 s
4.7 s
5.4 s
Checks
26
12 PASS 5 REVIEW 6 FIX
F
Page Weight Budget
Action
9.3 MB transferred, 97 requests
FIX
9.3 MB transferred, 97 requests
Critical::
Page weighs 12.4 MB (9.3 MB transferred)
Warning::
Images are 4.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.0 MB
Warning::
JavaScript is 912 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 912 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 291 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 291 KB
Info::
97 HTTP requests
Info::
Estimated 2.0 g CO2 per page load
9.3 MB / 2.4 MB budget
9.3 MB transferred
97 requests
2.0 g CO2 per page load
Images 4.0 MiB 43%
Other 3.5 MiB 38%
JavaScript 912.0 KiB 10%
Fonts 576.1 KiB 6%
CSS 291.4 KiB 3%
HTML 16.1 KiB 0%
Other 2.6 KiB 0%
Other 1.7 KiB 0%
Other 837 B 0%
Other 547 B 0%
Other 353 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 (9.3 MiB of 9.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5825ms total JS execution
FIX
5825ms total JS execution
Warning::
https://www.fbi.gov/: 2015ms CPU time
Warning::
Unattributable: 995ms CPU time
Warning::
https://www.fbi.gov/++theme++fbigov.theme/director...: 834ms CPU time
Warning::
https://www.fbi.gov/++plone++production/++unique++...: 608ms CPU time
Warning::
https://www.fbi.gov/cdn-cgi/challenge-platform/scr...: 403ms CPU time
Warning::
Third-party scripts: 4830ms (83% of total)

Main Thread Breakdown

Style & Layout 39% Script Evaluation 27% Other 24% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.fbi.gov/2015ms60ms5ms3rd
Unattributable995ms14ms0ms1st
https://www.fbi.gov/++theme++fbigov.theme/directors-theme/js/main.js834ms87ms6ms3rd
https://www.fbi.gov/++plone++production/++unique++2026-07-07T20:39:40.431302/default.js608ms405ms124ms3rd
https://www.fbi.gov/cdn-cgi/challenge-platform/scripts/jsd/main.js403ms299ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DBEM2FVVRF300ms248ms50ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L254ms210ms42ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js104ms101ms2ms3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOJ&subagency=FBI95ms90ms4ms3rd
https://www.fbi.gov/++plone++castle-advantage/libs/audioplayer/audioplayer.js83ms48ms34ms3rd

Showing top 10 of 12 scripts

D
JS Bundles
Action
12 scripts, 499 KB unused
FIX
12 scripts, 499 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: 499 KB
499 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-CSLL4ZEK4L151 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 · 9.3 MB · 499 KB savings available
FIX
97 resources · 9.3 MB · 499 KB savings available
Warning::
Page weight 9.3 MB exceeds 1 MB target by 8.3 MB
Got: 9.3 MB Expected: ≤ 1 MB
Info::
~499 KB of savings available
Warning::
96 third-party resources (100% of weight)
Info::
10 resources over 200KB
97 resources · 9.3 MiB · 96 third-party 8.3 MiB over 1MB target
Image 43% · 4.0 MiB
Media 38% · 3.5 MiB
JavaScript 10% · 912.0 KiB
Font 6% · 576.1 KiB
CSS 3% · 291.4 KiB
Document 0% · 16.7 KiB
Other 0% · 3.9 KiB

~498.9 KiB of savings available

Remove unused JavaScript: 498.9 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
50 images, 0 KB saveable
REVIEW
50 images, 0 KB saveable
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/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/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/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/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/total-criminal-of... 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/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.
50 images 4.0 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
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.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 5.8 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
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 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 FCP 8.1 s LCP 24.2 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 — 130 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 — 256 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 — 115 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 — 324 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 — 222 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 — 64 ms — font-display: swap
LDI2apCSOBg7S-QT7pbYF_O... woff2 swap
Size 9 KB
Load time 130 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 256 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
bootstrap-icons.woff2 woff2 swap
Size 128 KB
Load time 115 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 324 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
LDIxapCSOBg7S-QT7p4HM-a... woff2 swap
Size 9 KB
Load time 222 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
Rajdhani-Bold.ttf ttf swap
Size 365 KB
Load time 64 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+
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+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues 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
97 requests over 3560ms
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 FCP 8.1 s LCP 24.2 shttps://fbi.gov// https://fbi.gov/ — 301 — 584 B — 70 ms — h2https://www.fbi.gov/www.fbi.gov/ https://www.fbi.gov/ — 200 — 16.1 KiB — 323 ms — h2https://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 — 216.3 KiB — 102 ms — h2https://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 — 1.2 KiB — 91 ms — h2https://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 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h2https://www.fbi.gov/fbi-homepage/herowww.fbi.gov/fbi-homepage/hero https://www.fbi.gov/fbi-homepage/hero — 206 — 29.9 KiB — 190 ms — h3https://www.fbi.gov/@@site-icon.png?scale=32www.fbi.gov/@@site-icon.png?scale=3... https://www.fbi.gov/@@site-icon.png?scale=32 — 200 — 1.6 KiB — 32 ms — h3https://www.fbi.gov/fbi-homepage/herowww.fbi.gov/fbi-homepage/hero https://www.fbi.gov/fbi-homepage/hero — 206 — 48.5 KiB — 183 ms — h3https://www.fbi.gov/fbi-homepage/herowww.fbi.gov/fbi-homepage/hero https://www.fbi.gov/fbi-homepage/hero — 206 — 3.5 MiB — 163 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
83% of JavaScript execution is third-party
First-party Third-party 4830ms · 1129KB · $64/mo
www.fbi.gov
Other
Costly
Execution 2015ms
Transfer 16 KB
Monthly Cost $27/mo
www.fbi.gov
Other
Costly
Execution 834ms
Transfer 3 KB
Monthly Cost $11/mo
www.fbi.gov
Other
Costly
Execution 608ms
Transfer 341 KB
Unused 65%
Monthly Cost $8/mo
www.fbi.gov
Other
Costly
Execution 403ms
Transfer 0 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 300ms
Transfer 175 KB
Unused 39%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 254ms
Transfer 151 KB
Unused 43%
Monthly Cost $3/mo
dap.digitalgov.gov
Other
Optional
Execution 104ms
Transfer 5 KB
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 95ms
Transfer 9 KB
Monthly Cost $1/mo
www.fbi.gov
Other
Optional
Execution 83ms
Transfer 60 KB
Unused 66%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 80ms
Transfer 151 KB
Unused 72%
Monthly Cost $1/mo
www.fbi.gov
Other
Optional
Execution 55ms
Transfer 216 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.fbi.gov adds 2015ms and costs ~$27/month
  • www.fbi.gov adds 834ms and costs ~$11/month
  • www.fbi.gov adds 608ms and costs ~$8/month
  • www.fbi.gov adds 403ms and costs ~$5/month
  • Google Tag Manager adds 300ms and costs ~$4/month
  • Google Tag Manager adds 254ms and costs ~$3/month

83% 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 2015ms 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 834ms 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 608ms 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

www.fbi.gov takes 403ms 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 300ms 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 254ms 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

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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