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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

1.02 s

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

2.16 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.

0.112

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

1.02 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.

2.17 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
11.2 MB transferred, 68 requests
FIX
11.2 MB transferred, 68 requests
Critical::
Page weighs 13.8 MB (11.2 MB transferred)
Warning::
Images are 9.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 9.7 MB
Warning::
JavaScript is 865 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 865 KB
Info::
Fonts are 438 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 438 KB
Info::
68 HTTP requests
Info::
Estimated 2.4 g CO2 per page load
11.2 MB / 2.4 MB budget
11.2 MB transferred
68 requests
2.4 g CO2 per page load
Images 9.7 MiB 87%
JavaScript 865.4 KiB 8%
Fonts 437.9 KiB 4%
CSS 181.5 KiB 2%
Other 12.0 KiB 0%
HTML 10.7 KiB 0%
Other 2.9 KiB 0%
Other 1.1 KiB 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

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 (11.2 MiB of 11.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
22 scripts, 407 KB unused
FIX
22 scripts, 407 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-1QQK...: 107 KB unused (71%)
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/gtm.js?id=GTM-WGT...: 68 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-1QQK...: 64 KB unused (42%)
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.
Info::
Total unused JavaScript: 407 KB
407 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-1QQK83MZ36&cx=c&gtm=4e64k0152 KB107 KB (71%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k0147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WGTWNGX132 KB68 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-1QQK83MZ36152 KB64 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://www.opm.gov/cdn/js/opm-uswds/core.standard.js?v=2023022124 KB—✗3rd
https://www.opm.gov/control-panel/js/control-panel.js?v=17768934075021 KB—✓3rd
https://www.opm.gov/frequently-asked-questions/23 KB—✓3rd
https://www.opm.gov/js/core/webmethods.js2 KB—✓3rd
https://www.opm.gov/json/alerts.json?callback=LoadGlobalBanner&_=17768934073301 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
68 resources · 11.2 MB · 407 KB savings available
FIX
68 resources · 11.2 MB · 407 KB savings available
Warning::
Page weight 10.2 MB over 1MB target
Got: 11.2 MB Expected: ≤ 1 MB
Info::
~407 KB of savings available
Warning::
67 third-party resources (100% of weight)
Info::
3 resources over 200KB
68 resources · 11.2 MiB · 67 third-party 10.2 MiB over 1MB target
Image 87% · 9.8 MiB
JavaScript 8% · 875.6 KiB
Font 4% · 437.9 KiB
CSS 2% · 181.5 KiB
Document 0% · 10.7 KiB
Other 0% · 4.5 KiB

~407.1 KiB of savings available

Remove unused JavaScript: 407.1 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
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://www.opm.gov/media/pyfnqesc/audience_2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.opm.gov/cdn/img/opm-uswds/opm_logo_whi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.opm.gov/cdn/img/us_flag_small.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.opm.gov/cdn/img/opm-uswds/opm_logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.opm.gov/media/gkmkxrk5/audience_3.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.opm.gov/media/w2rck50b/audience_1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 9.7 MB
0 oversized -0 KB
19 legacy format
6 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

B
JS Execution Cost
689ms total JS execution
REVIEW
689ms total JS execution
Info::
Unattributable: 174ms CPU time
Info::
https://www.opm.gov/cdn/js/opm-uswds/core.standard...: 106ms CPU time
Info::
https://www.opm.gov/cdn/js/uswds.min.js: 91ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 83ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WGT...: 83ms CPU time
Warning::
Third-party scripts: 689ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 24% Style & Layout 13% Script Parsing & Compilation 12% Parse HTML & CSS 8%
ScriptTotalScriptingParse/CompileParty
Unattributable174ms4ms0ms3rd
https://www.opm.gov/cdn/js/opm-uswds/core.standard.js?v=20230221106ms62ms9ms3rd
https://www.opm.gov/cdn/js/uswds.min.js91ms13ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L83ms68ms15ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WGTWNGX83ms60ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-1QQK83MZ3682ms66ms16ms3rd
https://www.opm.gov/70ms2ms1ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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 (438 KB)
PASS
4 fonts (438 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

438 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 2.2 shttps://www.opm.gov/cdn/fonts/public-sans/PublicSans-Regular.woff2PublicSans-Regular.woff2 https://www.opm.gov/cdn/fonts/public-sans/PublicSans-Regular.woff2 — 32.2 KiB — 20 ms — font-display: swaphttps://www.opm.gov/cdn/fonts/public-sans/PublicSans-Bold.woff2PublicSans-Bold.woff2 https://www.opm.gov/cdn/fonts/public-sans/PublicSans-Bold.woff2 — 32.1 KiB — 35 ms — font-display: swaphttps://use.typekit.net/af/a19ad7/00000000000000003b9b4051/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/a19ad7/00000000000000003b9b4051/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 55.3 KiB — 44 ms — font-display: swaphttps://www.opm.gov/cdn/lib/font-awesome/6.2.0/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.opm.gov/cdn/lib/font-awesome/6.2.0/webfonts/fa-solid-900.woff2 — 318.4 KiB — 98 ms — font-display: swap
PublicSans-Regular.woff2 woff2 swap
Size 32 KB
Load time 20 ms
Start 552 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 32 KB
Load time 35 ms
Start 553 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 55 KB
Load time 44 ms
Start 553 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 318 KB
Load time 98 ms
Start 554 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
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 ~159 KB and ~318 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
Network Waterfall
68 requests over 1496ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 2.2 shttps://opm.gov// https://opm.gov/ — 302 — 321 B — 167 ms — http/1.1https://www.opm.gov/www.opm.gov/ https://www.opm.gov/ — 200 — 10.7 KiB — 25 ms — http/1.1https://www.opm.gov/cdn/css/themes/opm-uswds/styles.css?v=20240724www.opm.gov/cdn/css/themes/opm-uswd... https://www.opm.gov/cdn/css/themes/opm-uswds/styles.css?v=20240724 — 200 — 60.5 KiB — 22 ms — http/1.1https://www.opm.gov/cdn/css/responsive/global-medium.csswww.opm.gov/cdn/css/responsive/glob... https://www.opm.gov/cdn/css/responsive/global-medium.css — 200 — 8.4 KiB — 27 ms — http/1.1https://www.opm.gov/cdn/css/responsive/global-small.csswww.opm.gov/cdn/css/responsive/glob... https://www.opm.gov/cdn/css/responsive/global-small.css — 200 — 3.3 KiB — 23 ms — http/1.1https://www.opm.gov/cdn/lib/font-awesome/6.2.0/css/all.min.csswww.opm.gov/cdn/lib/font-awesome/6.... https://www.opm.gov/cdn/lib/font-awesome/6.2.0/css/all.min.css — 200 — 97.7 KiB — 48 ms — http/1.1https://www.opm.gov/cdn/lib/font-awesome/6.2.0/css/v5-font-face.min.csswww.opm.gov/cdn/lib/font-awesome/6.... https://www.opm.gov/cdn/lib/font-awesome/6.2.0/css/v5-font-face.min.css — 200 — 812 B — 33 ms — http/1.1https://use.typekit.net/vgn7vpt.cssuse.typekit.net/vgn7vpt.css https://use.typekit.net/vgn7vpt.css — 200 — 983 B — 40 ms — h2https://www.opm.gov/cdn/css/lib/colorbox/colorbox.csswww.opm.gov/cdn/css/lib/colorbox/co... https://www.opm.gov/cdn/css/lib/colorbox/colorbox.css — 200 — 2.1 KiB — 37 ms — http/1.1https://www.opm.gov/css/home/home.css?v=2023020www.opm.gov/css/home/home.css?v=202... https://www.opm.gov/css/home/home.css?v=2023020 — 200 — 4.0 KiB — 204 ms — http/1.1https://www.opm.gov/faqs/styles/opmanswers.csswww.opm.gov/faqs/styles/opmanswers.... https://www.opm.gov/faqs/styles/opmanswers.css — 302 — 373 B — 72 ms — http/1.1https://ajax.googleapis.com/ajax/libs/jquery/3.6.3/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.6.3/jquery.min.js — 200 — 31.1 KiB — 34 ms — h2https://www.opm.gov/js/jstorage.min.jswww.opm.gov/js/jstorage.min.js https://www.opm.gov/js/jstorage.min.js — 200 — 2.0 KiB — 35 ms — http/1.1https://www.opm.gov/js/core/webmethods.setup.jswww.opm.gov/js/core/webmethods.setu... https://www.opm.gov/js/core/webmethods.setup.js — 200 — 917 B — 47 ms — http/1.1https://fonts.googleapis.com/css?family=Merriweather:400,700|Source+Sans+Pro:400,600,700&display=swapfonts.googleapis.com/css?family=Mer... https://fonts.googleapis.com/css?family=Merriweather:400,700|Source+Sans+Pro:400,600,700&display=swap — 200 — 1.2 KiB — 15 ms — h2https://www.opm.gov/cdn/img/us_flag_small.pngwww.opm.gov/cdn/img/us_flag_small.p... https://www.opm.gov/cdn/img/us_flag_small.png — 200 — 630 B — 14 ms — http/1.1https://www.opm.gov/cdn/img/icon-dot-gov.svgwww.opm.gov/cdn/img/icon-dot-gov.sv... https://www.opm.gov/cdn/img/icon-dot-gov.svg — 200 — 1.2 KiB — 16 ms — http/1.1https://p.typekit.net/p.css?s=1&k=vgn7vpt&ht=tk&f=22792.22793.40090.40092&a=39978598&app=typekit&e=cssp.typekit.net/p.css?s=1&k=vgn7vpt&h... https://p.typekit.net/p.css?s=1&k=vgn7vpt&ht=tk&f=22792.22793.40090.40092&a=39978598&app=typekit&e=css — 200 — 172 B — 22 ms — h2https://www.opm.gov/frequently-asked-questions/www.opm.gov/frequently-asked-questi... https://www.opm.gov/frequently-asked-questions/ — -1 — 0 B — 16 ms — https://www.opm.gov/cdn/img/icon-https.svgwww.opm.gov/cdn/img/icon-https.svg https://www.opm.gov/cdn/img/icon-https.svg — 200 — 1.1 KiB — 15 ms — http/1.1https://www.opm.gov/cdn/img/opm-uswds/opm_logo.svgwww.opm.gov/cdn/img/opm-uswds/opm_l... https://www.opm.gov/cdn/img/opm-uswds/opm_logo.svg — 200 — 12.8 KiB — 19 ms — http/1.1https://www.opm.gov/cdn/img/close-white.svgwww.opm.gov/cdn/img/close-white.svg https://www.opm.gov/cdn/img/close-white.svg — 200 — 1.7 KiB — 11 ms — http/1.1https://www.opm.gov/cdn/js/uswds.min.jswww.opm.gov/cdn/js/uswds.min.js https://www.opm.gov/cdn/js/uswds.min.js — 200 — 25.6 KiB — 14 ms — http/1.1https://www.opm.gov/cdn/js/core/core.standard.libs.js?v=20191104www.opm.gov/cdn/js/core/core.standa... https://www.opm.gov/cdn/js/core/core.standard.libs.js?v=20191104 — 200 — 13.1 KiB — 11 ms — http/1.1https://www.opm.gov/cdn/js/opm-uswds/core.standard.js?v=20230221www.opm.gov/cdn/js/opm-uswds/core.s... https://www.opm.gov/cdn/js/opm-uswds/core.standard.js?v=20230221 — 200 — 23.6 KiB — 11 ms — http/1.1https://www.opm.gov/faqs/scripts/scripts.jswww.opm.gov/faqs/scripts/scripts.js https://www.opm.gov/faqs/scripts/scripts.js — 302 — 383 B — 8 ms — http/1.1https://www.opm.gov/js/loadfaqs.jswww.opm.gov/js/loadfaqs.js https://www.opm.gov/js/loadfaqs.js — 200 — 865 B — 9 ms — http/1.1https://www.opm.gov/frequently-asked-questions/www.opm.gov/frequently-asked-questi... https://www.opm.gov/frequently-asked-questions/ — 200 — 23.3 KiB — 12 ms — http/1.1https://www.opm.gov/js/core/webmethods.jswww.opm.gov/js/core/webmethods.js https://www.opm.gov/js/core/webmethods.js — 200 — 1.7 KiB — 9 ms — http/1.1https://www.opm.gov/img/global/Flag.gifwww.opm.gov/img/global/Flag.gif https://www.opm.gov/img/global/Flag.gif — 200 — 2.3 KiB — 10 ms — http/1.1
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Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 689ms · 491KB · $9/mo
Unattributable
Other
Optional
Execution 174ms
Transfer 0 KB
Monthly Cost $2/mo
www.opm.gov
Other
Optional
Execution 106ms
Transfer 24 KB
Monthly Cost $1/mo
www.opm.gov
Other
Optional
Execution 91ms
Transfer 26 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 147 KB
Unused 43%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 132 KB
Unused 51%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 82ms
Transfer 152 KB
Unused 42%
Monthly Cost $1/mo
www.opm.gov
Other
Optional
Execution 70ms
Transfer 11 KB
Monthly Cost $1/mo

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

51% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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