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://home.treasury.gov/themes/custom/hamilton/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://home.treasury.gov/libraries/uswds/src/img/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://home.treasury.gov/system/files/136/secreta... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://home.treasury.gov/system/files/2025-12/Tre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17images3.1 MB
0oversized-0 KB
15legacy format
4missing 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
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
5 fonts (159 KB)
PASS
5 fonts (159 KB)
Info::
i
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
159 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
6xK3dSBYKcSV-LCoeQqfX1R...woff2swap
Size15 KB
Load time19 ms
Start1.7 s
RiskFOUT — text flashes from fallback to web font
sourcesanspro-regular-w...woff2swap
Size20 KB
Load time21 ms
Start1.7 s
RiskFOUT — text flashes from fallback to web font
u-4e0qyriQwlOrhSvowK_l5...woff2swap
Size95 KB
Load time22 ms
Start1.7 s
RiskFOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R...woff2swap
Size15 KB
Load time15 ms
Start1.7 s
RiskFOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R...woff2swap
Size14 KB
Load time17 ms
Start1.7 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)
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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
✓
Page uses 1 resource hint(s)
Current Resource Hints
preconnect—
preload
1
dns-prefetch—
prefetch—
1 resource hints configured
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
53 requests over 2884ms
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-party3950ms · 1384KB · $23/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
home.treasury.gov
home.treasury.gov
Other
906ms
26 KB
—
$5/mo
Costly
Unattributable
Unattributable
Other
707ms
0 KB
—
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
427ms
160 KB
39%
$2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
373ms
147 KB
42%
$2/mo
Costly
home.treasury.gov
home.treasury.gov
Other
294ms
32 KB
—
$2/mo
Costly
use.fontawesome.com
use.fontawesome.com
Other
205ms
429 KB
—
$1/mo
Costly
home.treasury.gov
home.treasury.gov
Other
174ms
9 KB
—
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
172ms
116 KB
55%
$1/mo
Optional
home.treasury.gov
home.treasury.gov
Other
168ms
97 KB
70%
$1/mo
Optional
s.go-mpulse.net
s.go-mpulse.net
Other
104ms
56 KB
66%
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
89ms
147 KB
72%
$1/mo
Optional
dap.digitalgov.gov
dap.digitalgov.gov
Other
88ms
9 KB
—
$1/mo
Optional
dap.digitalgov.gov
dap.digitalgov.gov
Other
71ms
4 KB
—
$0/mo
Optional
home.treasury.gov
home.treasury.gov
Other
68ms
90 KB
—
$0/mo
Optional
Google Analytics
www.google-analytics.com
Analytics
53ms
21 KB
—
$0/mo
Optional
home.treasury.gov
home.treasury.gov
Other
52ms
39 KB
86%
$0/mo
Optional
home.treasury.gov
Other
Costly
Execution906ms
Transfer26 KB
Monthly Cost$5/mo
Unattributable
Other
Costly
Execution707ms
Transfer0 KB
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution427ms
Transfer160 KB
Unused39%
Monthly Cost$2/mo
Google Tag Manager
Tag Manager
Costly
Execution373ms
Transfer147 KB
Unused42%
Monthly Cost$2/mo
home.treasury.gov
Other
Costly
Execution294ms
Transfer32 KB
Monthly Cost$2/mo
use.fontawesome.com
Other
Costly
Execution205ms
Transfer429 KB
Monthly Cost$1/mo
home.treasury.gov
Other
Optional
Execution174ms
Transfer9 KB
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution172ms
Transfer116 KB
Unused55%
Monthly Cost$1/mo
home.treasury.gov
Other
Optional
Execution168ms
Transfer97 KB
Unused70%
Monthly Cost$1/mo
s.go-mpulse.net
Other
Optional
Execution104ms
Transfer56 KB
Unused66%
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution89ms
Transfer147 KB
Unused72%
Monthly Cost$1/mo
dap.digitalgov.gov
Other
Optional
Execution88ms
Transfer9 KB
Monthly Cost$1/mo
dap.digitalgov.gov
Other
Optional
Execution71ms
Transfer4 KB
Monthly Cost$0/mo
home.treasury.gov
Other
Optional
Execution68ms
Transfer90 KB
Monthly Cost$0/mo
Google Analytics
Analytics
Optional
Execution53ms
Transfer21 KB
Monthly Cost$0/mo
home.treasury.gov
Other
Optional
Execution52ms
Transfer39 KB
Unused86%
Monthly Cost$0/mo
These scripts may cost more than they're worth
home.treasury.gov adds 906ms and costs ~$5/month
Unattributable adds 707ms and costs ~$4/month
Google Tag Manager adds 427ms and costs ~$2/month
Google Tag Manager adds 373ms and costs ~$2/month
home.treasury.gov adds 294ms and costs ~$2/month
use.fontawesome.com adds 205ms and costs ~$1/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
home.treasury.gov takes 906ms 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
Unattributable takes 707ms 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 427ms 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 373ms 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
home.treasury.gov takes 294ms 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
use.fontawesome.com takes 205ms 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
70% of home.treasury.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
66% of s.go-mpulse.net'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
86% of home.treasury.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.