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
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
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/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/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.
17images9.7 MB
0oversized-0 KB
17legacy format
6missing dimensionsCLS 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
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
7 fonts (562 KB)
PASS
7 fonts (562 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
562 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
PublicSans-Regular.woff2woff2swap
Size32 KB
Load time208 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
6xK3dSBYKcSV-LCoeQqfX1R...woff2swap
Size15 KB
Load time18 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R...woff2swap
Size14 KB
Load time20 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
PublicSans-Bold.woff2woff2swap
Size32 KB
Load time266 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
u-4e0qyriQwlOrhSvowK_l5...woff2swap
Size95 KB
Load time25 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
fa-solid-900.woff2woff2swap
Size318 KB
Load time283 ms
Start1.6 s
RiskFOUT — 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
lwoff2swap
Size55 KB
Load time30 ms
Start1.6 s
RiskFOUT — 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)
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
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
68 requests over 3135ms
INFO
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-party3365ms · 831KB · $45/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
998ms
0 KB
—
$13/mo
Costly
www.opm.gov
www.opm.gov
Other
428ms
26 KB
—
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
420ms
152 KB
41%
$6/mo
Costly
www.opm.gov
www.opm.gov
Other
364ms
24 KB
—
$5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
307ms
147 KB
42%
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
227ms
132 KB
55%
$3/mo
Costly
www.opm.gov
www.opm.gov
Other
163ms
11 KB
—
$2/mo
Optional
dap.digitalgov.gov
dap.digitalgov.gov
Other
131ms
4 KB
—
$2/mo
Optional
ajax.googleapis.com
ajax.googleapis.com
Other
100ms
31 KB
—
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
86ms
147 KB
72%
$1/mo
Optional
www.opm.gov
www.opm.gov
Other
86ms
98 KB
—
$1/mo
Optional
www.opm.gov
www.opm.gov
Other
55ms
60 KB
—
$1/mo
Optional
Unattributable
Other
Costly
Execution998ms
Transfer0 KB
Monthly Cost$13/mo
www.opm.gov
Other
Costly
Execution428ms
Transfer26 KB
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution420ms
Transfer152 KB
Unused41%
Monthly Cost$6/mo
www.opm.gov
Other
Costly
Execution364ms
Transfer24 KB
Monthly Cost$5/mo
Google Tag Manager
Tag Manager
Costly
Execution307ms
Transfer147 KB
Unused42%
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution227ms
Transfer132 KB
Unused55%
Monthly Cost$3/mo
www.opm.gov
Other
Optional
Execution163ms
Transfer11 KB
Monthly Cost$2/mo
dap.digitalgov.gov
Other
Optional
Execution131ms
Transfer4 KB
Monthly Cost$2/mo
ajax.googleapis.com
Other
Optional
Execution100ms
Transfer31 KB
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution86ms
Transfer147 KB
Unused72%
Monthly Cost$1/mo
www.opm.gov
Other
Optional
Execution86ms
Transfer98 KB
Monthly Cost$1/mo
www.opm.gov
Other
Optional
Execution55ms
Transfer60 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
Unattributable adds 998ms and costs ~$13/month
www.opm.gov adds 428ms and costs ~$6/month
Google Tag Manager adds 420ms and costs ~$6/month
www.opm.gov adds 364ms and costs ~$5/month
Google Tag Manager adds 307ms and costs ~$4/month
Google Tag Manager adds 227ms 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
Unattributable takes 998ms 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.opm.gov takes 428ms 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 420ms 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.opm.gov takes 364ms 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 307ms 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 227ms 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
55% 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
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.