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
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Warning::
!
https://www.vermont.gov/sites/vermont/files/2025-0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vermont.gov/themes/custom/vt2018/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vermont.gov/themes/custom/vt2018/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vermont.gov/sites/vermont/files/users/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vermont.gov/sites/vermont/files/users/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vermont.gov/sites/vermont/files/2023-0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vermont.gov/themes/custom/vt2018/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vermont.gov/themes/custom/vt2018/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.vermont.gov/themes/custom/vt2018/image... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
29images3.0 MB
0oversized-0 KB
29legacy format
9missing 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
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
4 fonts (157 KB)
PASS
4 fonts (157 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
157 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
jizDREVItHgc8qDIbSTKq4X...woff2swap
Size29 KB
Load time98 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
jizBREVItHgc8qDIbSTKq4X...woff2swap
Size32 KB
Load time95 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
JTUSjIg1_i6t8kCHKm459Wl...woff2swap
Size35 KB
Load time59 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
fa-solid-900.woff2woff2swap
Size62 KB
Load time1.3 s
Start1.1 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
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
110 requests over 3493ms
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-party3408ms · 1453KB · $45/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.vermont.gov
www.vermont.gov
Other
1286ms
11 KB
—
$17/mo
Costly
Unattributable
Unattributable
Other
515ms
0 KB
—
$7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
261ms
157 KB
41%
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
234ms
158 KB
43%
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
218ms
157 KB
43%
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
186ms
120 KB
53%
$2/mo
Optional
translate.googleapis.com
translate.googleapis.com
Other
143ms
119 KB
80%
$2/mo
Optional
cse.google.com
cse.google.com
Other
99ms
4 KB
—
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
96ms
121 KB
55%
$1/mo
Optional
use.fontawesome.com
use.fontawesome.com
Other
95ms
324 KB
—
$1/mo
Optional
www.vermont.gov
www.vermont.gov
Other
95ms
7 KB
—
$1/mo
Optional
www.google.com
www.google.com
Other
67ms
98 KB
49%
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
59ms
157 KB
70%
$1/mo
Optional
Google Analytics
www.google-analytics.com
Analytics
55ms
21 KB
—
$1/mo
Optional
www.vermont.gov
Other
Costly
Execution1286ms
Transfer11 KB
Monthly Cost$17/mo
Unattributable
Other
Costly
Execution515ms
Transfer0 KB
Monthly Cost$7/mo
Google Tag Manager
Tag Manager
Costly
Execution261ms
Transfer157 KB
Unused41%
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Costly
Execution234ms
Transfer158 KB
Unused43%
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Costly
Execution218ms
Transfer157 KB
Unused43%
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Optional
Execution186ms
Transfer120 KB
Unused53%
Monthly Cost$2/mo
translate.googleapis.com
Other
Optional
Execution143ms
Transfer119 KB
Unused80%
Monthly Cost$2/mo
cse.google.com
Other
Optional
Execution99ms
Transfer4 KB
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution96ms
Transfer121 KB
Unused55%
Monthly Cost$1/mo
use.fontawesome.com
Other
Optional
Execution95ms
Transfer324 KB
Monthly Cost$1/mo
www.vermont.gov
Other
Optional
Execution95ms
Transfer7 KB
Monthly Cost$1/mo
www.google.com
Other
Optional
Execution67ms
Transfer98 KB
Unused49%
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution59ms
Transfer157 KB
Unused70%
Monthly Cost$1/mo
Google Analytics
Analytics
Optional
Execution55ms
Transfer21 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.vermont.gov adds 1286ms and costs ~$17/month
Unattributable adds 515ms and costs ~$7/month
Google Tag Manager adds 261ms and costs ~$3/month
Google Tag Manager adds 234ms and costs ~$3/month
Google Tag Manager adds 218ms 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
www.vermont.gov takes 1286ms 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 515ms 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 261ms 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 234ms 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 218ms 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
53% 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
80% of translate.googleapis.com'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
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 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.