Skip to content
https://ic3.gov

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
3
PASS
10
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.23 s

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

3.80 s

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

0 ms

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

0.095

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

3.68 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.

3.80 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
10 PASS 3 REVIEW 2 FIX
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 (367.5 KiB of 367.6 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://www.ic3.gov/img/fbi_seal_new.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ic3.gov/assets/img/us_flag_small.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ic3.gov/img/losses.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ic3.gov/assets/img/material-icons/rss_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ic3.gov/img/ic3_logo.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 183 KB
0 oversized -0 KB
8 legacy format
5 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

B
JS Execution Cost
522ms total JS execution
REVIEW
522ms total JS execution
Warning::
https://www.ic3.gov/: 353ms CPU time
Info::
Unattributable: 169ms CPU time
Warning::
Third-party scripts: 522ms (100% of total)

Main Thread Breakdown

Style & Layout 39% Other 33% Rendering 11% Script Evaluation 9% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://www.ic3.gov/353ms4ms2ms3rd
Unattributable169ms7ms0ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
368 KB transferred, 23 requests
PASS
368 KB transferred, 23 requests
Info::
Page weighs 948 KB (368 KB transferred)
Info::
23 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
368 KB / 2.4 MB budget
368 KB transferred
23 requests
0.08 g CO2 per page load
Images 182.7 KiB 50%
Fonts 82.6 KiB 22%
CSS 50.2 KiB 14%
JavaScript 33.5 KiB 9%
HTML 15.3 KiB 4%
Other 3.4 KiB 1%
0 2.4 MB 4.9 MB
Under budget
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
4 fonts (83 KB)
PASS
4 fonts (83 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

83 KB total

Render-blocking

0

of 4

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 3.2 s LCP 3.8 shttps://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.5 KiB — 161 ms — font-display: swaphttps://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.2 KiB — 170 ms — font-display: swaphttps://www.ic3.gov/assets/fonts/merriweather/Latin-Merriweather-Regular.woff2Latin-Merriweather-Regu... https://www.ic3.gov/assets/fonts/merriweather/Latin-Merriweather-Regular.woff2 — 21.6 KiB — 185 ms — font-display: swaphttps://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-light-webfont.woff2sourcesanspro-light-web... https://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-light-webfont.woff2 — 20.3 KiB — 196 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 20 KB
Load time 161 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 170 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Regu... woff2 swap
Size 22 KB
Load time 185 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-light-web... woff2 swap
Size 20 KB
Load time 196 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
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)
A+
JS Bundles
3 scripts, 0 KB unused
PASS
3 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ic3.gov/assets/js/uswds-init.min.js1 KB—✓3rd
https://www.ic3.gov/assets/js/uswds.min.js23 KB—✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOJ9 KB—✓3rd
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
Page Weight Inventory
23 resources · 368 KB · 0 KB savings available
PASS
23 resources · 368 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 368 KB
Warning::
22 third-party resources (100% of weight)
23 resources · 367.6 KiB · 22 third-party Within 1MB page-weight target
Image 51% · 186.0 KiB
Font 22% · 82.6 KiB
CSS 14% · 50.2 KiB
JavaScript 9% · 33.5 KiB
Document 4% · 15.4 KiB
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
Network Waterfall
23 requests over 1849ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 3.2 s LCP 3.8 shttps://ic3.gov// https://ic3.gov/ — 308 — 117 B — 468 ms — h2https://www.ic3.gov/www.ic3.gov/ https://www.ic3.gov/ — 200 — 15.3 KiB — 573 ms — h2https://www.ic3.gov/assets/js/uswds-init.min.jswww.ic3.gov/assets/js/uswds-init.mi... https://www.ic3.gov/assets/js/uswds-init.min.js — 200 — 665 B — 149 ms — h2https://www.ic3.gov/assets/js/uswds.min.jswww.ic3.gov/assets/js/uswds.min.js https://www.ic3.gov/assets/js/uswds.min.js — 200 — 23.5 KiB — 261 ms — h2https://www.ic3.gov/assets/css/uswds.min.csswww.ic3.gov/assets/css/uswds.min.cs... https://www.ic3.gov/assets/css/uswds.min.css — 200 — 47.5 KiB — 403 ms — h2https://www.ic3.gov/css/site.csswww.ic3.gov/css/site.css https://www.ic3.gov/css/site.css — 200 — 2.6 KiB — 148 ms — h2https://www.ic3.gov/assets/img/us_flag_small.pngwww.ic3.gov/assets/img/us_flag_smal... https://www.ic3.gov/assets/img/us_flag_small.png — 200 — 580 B — 138 ms — h2https://www.ic3.gov/assets/img/icon-dot-gov.svgwww.ic3.gov/assets/img/icon-dot-gov... https://www.ic3.gov/assets/img/icon-dot-gov.svg — 200 — 973 B — 149 ms — h2https://www.ic3.gov/assets/img/icon-https.svgwww.ic3.gov/assets/img/icon-https.s... https://www.ic3.gov/assets/img/icon-https.svg — 200 — 1.0 KiB — 263 ms — h2https://www.ic3.gov/img/ic3_logo.webpwww.ic3.gov/img/ic3_logo.webp https://www.ic3.gov/img/ic3_logo.webp — 200 — 36.9 KiB — 330 ms — h2https://www.ic3.gov/assets/img/usa-icons-bg/search--white.svgwww.ic3.gov/assets/img/usa-icons-bg... https://www.ic3.gov/assets/img/usa-icons-bg/search--white.svg — 200 — 692 B — 291 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOJdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOJ — 200 — 9.4 KiB — 58 ms — h3https://www.ic3.gov/img/losses.webpwww.ic3.gov/img/losses.webp https://www.ic3.gov/img/losses.webp — 200 — 24.6 KiB — 284 ms — h2https://www.ic3.gov/assets/img/material-icons/rss_feed.svgwww.ic3.gov/assets/img/material-ico... https://www.ic3.gov/assets/img/material-icons/rss_feed.svg — 200 — 614 B — 284 ms — h2https://www.ic3.gov/img/fbi_seal_new.webpwww.ic3.gov/img/fbi_seal_new.webp https://www.ic3.gov/img/fbi_seal_new.webp — 200 — 115.9 KiB — 451 ms — h2https://www.ic3.gov/assets/img/usa-icons/expand_more.svgwww.ic3.gov/assets/img/usa-icons/ex... https://www.ic3.gov/assets/img/usa-icons/expand_more.svg — 200 — 530 B — 188 ms — h2https://www.ic3.gov/assets/img/usa-icons/error.svgwww.ic3.gov/assets/img/usa-icons/er... https://www.ic3.gov/assets/img/usa-icons/error.svg — 200 — 571 B — 184 ms — h2https://www.ic3.gov/assets/img/usa-icons/warning.svgwww.ic3.gov/assets/img/usa-icons/wa... https://www.ic3.gov/assets/img/usa-icons/warning.svg — 200 — 536 B — 182 ms — h2https://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2www.ic3.gov/assets/fonts/source-san... https://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 200 — 20.5 KiB — 161 ms — h2https://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2www.ic3.gov/assets/fonts/source-san... https://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 200 — 20.2 KiB — 170 ms — h2https://www.ic3.gov/assets/fonts/merriweather/Latin-Merriweather-Regular.woff2www.ic3.gov/assets/fonts/merriweath... https://www.ic3.gov/assets/fonts/merriweather/Latin-Merriweather-Regular.woff2 — 200 — 21.6 KiB — 185 ms — h2https://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-light-webfont.woff2www.ic3.gov/assets/fonts/source-san... https://www.ic3.gov/assets/fonts/source-sans-pro/sourcesanspro-light-webfont.woff2 — 200 — 20.3 KiB — 196 ms — h2https://www.ic3.gov/img/favicon-32.pngwww.ic3.gov/img/favicon-32.png https://www.ic3.gov/img/favicon-32.png — 200 — 3.3 KiB — 133 ms — h2
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 522ms · 15KB · $7/mo
www.ic3.gov
Other
Costly
Execution 353ms
Transfer 15 KB
Monthly Cost $5/mo
Unattributable
Other
Optional
Execution 169ms
Transfer 0 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • www.ic3.gov adds 353ms 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.ic3.gov takes 353ms 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

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.

Send Feedback