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
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Warning::
!
https://www.wm.edu/images/wm_vertical_single_line.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.wm.edu/_homepage/_media/callout-otod.j... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.wm.edu/images/wm_logo_horizontal_green... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.wm.edu/peopleofwm/_images/tucker-peter... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
38images1.8 MB
0oversized-0 KB
24legacy 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
20 fonts (627 KB)
PASS
20 fonts (627 KB)
Info::
i
20 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
20
627 KB total
Render-blocking
0
of 20
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
lwoff2swap
Size52 KB
Load time31 ms
Start1000 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size51 KB
Load time21 ms
Start1000 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size46 KB
Load time32 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size51 KB
Load time28 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size48 KB
Load time24 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size49 KB
Load time43 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size53 KB
Load time16 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size54 KB
Load time11 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size53 KB
Load time18 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size49 KB
Load time8 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
pro-fa-solid-900-13.woff2woff2swap
Size13 KB
Load time36 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
pro-fa-brands-400-0.woff2woff2swap
Size37 KB
Load time43 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
pro-fa-regular-400-13.w...woff2swap
Size15 KB
Load time35 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
pro-fa-solid-900-12.woff2woff2swap
Size16 KB
Load time50 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
pro-fa-solid-900-0.woff2woff2swap
Size12 KB
Load time37 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
pro-fa-thin-100-12.woff2woff2swap
Size21 KB
Load time38 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA...woff2swap
Size1 KB
Load time19 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA...woff2swap
Size1 KB
Load time19 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA...woff2swap
Size2 KB
Load time18 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA...woff2swap
Size1 KB
Load time108 ms
Start2.7 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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
✓
Page uses 8 resource hint(s)
Current Resource Hints
preconnect—
preload—
dns-prefetch
8
prefetch—
8 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
131 requests over 3220ms
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-party6655ms · 1235KB · $88/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.wm.edu
www.wm.edu
Other
2151ms
21 KB
—
$29/mo
Costly
Unattributable
Unattributable
Other
918ms
0 KB
—
$12/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
591ms
157 KB
41%
$8/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
462ms
175 KB
34%
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
314ms
153 KB
41%
$4/mo
Costly
www.wm.edu
www.wm.edu
Other
293ms
7 KB
—
$4/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
289ms
126 KB
28%
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
262ms
172 KB
40%
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
233ms
144 KB
42%
$3/mo
Costly
www.wm.edu
www.wm.edu
Other
206ms
6 KB
—
$3/mo
Costly
cascade-prod.static.wm.edu
cascade-prod.static.wm.edu
Other
152ms
2 KB
—
$2/mo
Optional
cascade-prod.static.wm.edu
cascade-prod.static.wm.edu
Other
142ms
33 KB
—
$2/mo
Optional
Facebook Pixel
connect.facebook.net
Advertising
137ms
97 KB
35%
$2/mo
Optional
sc-static.net
sc-static.net
Other
123ms
25 KB
—
$2/mo
Optional
cascade-prod.static.wm.edu
cascade-prod.static.wm.edu
Other
117ms
97 KB
84%
$2/mo
Optional
kit.fontawesome.com
kit.fontawesome.com
Other
117ms
5 KB
—
$2/mo
Optional
kit.fontawesome.com
kit.fontawesome.com
Other
80ms
6 KB
—
$1/mo
Optional
www.wm.edu
www.wm.edu
Other
70ms
8 KB
—
$1/mo
Optional
www.wm.edu
Other
Costly
Execution2151ms
Transfer21 KB
Monthly Cost$29/mo
Unattributable
Other
Costly
Execution918ms
Transfer0 KB
Monthly Cost$12/mo
Google Tag Manager
Tag Manager
Costly
Execution591ms
Transfer157 KB
Unused41%
Monthly Cost$8/mo
Google Tag Manager
Tag Manager
Costly
Execution462ms
Transfer175 KB
Unused34%
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution314ms
Transfer153 KB
Unused41%
Monthly Cost$4/mo
www.wm.edu
Other
Costly
Execution293ms
Transfer7 KB
Monthly Cost$4/mo
Facebook Pixel
Advertising
Costly
Execution289ms
Transfer126 KB
Unused28%
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution262ms
Transfer172 KB
Unused40%
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Costly
Execution233ms
Transfer144 KB
Unused42%
Monthly Cost$3/mo
www.wm.edu
Other
Costly
Execution206ms
Transfer6 KB
Monthly Cost$3/mo
cascade-prod.static.wm.edu
Other
Optional
Execution152ms
Transfer2 KB
Monthly Cost$2/mo
cascade-prod.static.wm.edu
Other
Optional
Execution142ms
Transfer33 KB
Monthly Cost$2/mo
Facebook Pixel
Advertising
Optional
Execution137ms
Transfer97 KB
Unused35%
Monthly Cost$2/mo
sc-static.net
Other
Optional
Execution123ms
Transfer25 KB
Monthly Cost$2/mo
cascade-prod.static.wm.edu
Other
Optional
Execution117ms
Transfer97 KB
Unused84%
Monthly Cost$2/mo
kit.fontawesome.com
Other
Optional
Execution117ms
Transfer5 KB
Monthly Cost$2/mo
kit.fontawesome.com
Other
Optional
Execution80ms
Transfer6 KB
Monthly Cost$1/mo
www.wm.edu
Other
Optional
Execution70ms
Transfer8 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.wm.edu adds 2151ms and costs ~$29/month
Unattributable adds 918ms and costs ~$12/month
Google Tag Manager adds 591ms and costs ~$8/month
Google Tag Manager adds 462ms and costs ~$6/month
Google Tag Manager adds 314ms and costs ~$4/month
www.wm.edu adds 293ms and costs ~$4/month
Facebook Pixel adds 289ms and costs ~$4/month
Google Tag Manager adds 262ms and costs ~$3/month
Google Tag Manager adds 233ms and costs ~$3/month
www.wm.edu adds 206ms 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.wm.edu takes 2151ms 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 918ms 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 591ms 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 462ms 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 314ms 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.wm.edu takes 293ms 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
Facebook Pixel takes 289ms 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 262ms 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 233ms 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.wm.edu takes 206ms 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
84% of cascade-prod.static.wm.edu'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.