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
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
!
https://www.ou.edu/content/dam/homepage/one/WCOD.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.ou.edu/content/dam/news/images/article... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.ou.edu/content/dam/news/images/article... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.ou.edu/content/dam/homepage2012/design... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23images11.5 MB
0oversized-0 KB
21legacy 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
18 fonts (828 KB)
PASS
18 fonts (828 KB)
Info::
i
18 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
18
828 KB total
Render-blocking
0
of 18
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size37 KB
Load time8 ms
Start2.7 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size22 KB
Load time85 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size39 KB
Load time81 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size38 KB
Load time89 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size30 KB
Load time91 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
KFO5CnqEu92Fr1Mu53ZEC9_...woff2swap
Size41 KB
Load time15 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size26 KB
Load time69 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
fa-solid-900.woff2woff2swap
Size154 KB
Load time96 ms
Start2.9 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
BngMUXZYTXPIvIBgJJSb6uf...woff2swap
Size33 KB
Load time19 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
flUhRq6tzZclQEJ-Vdg-Iui...woff2swap
Size126 KB
Load time33 ms
Start2.9 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
Size28 KB
Load time97 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time57 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size0 KB
Load time79 ms
Start3.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size26 KB
Load time19 ms
Start3.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size27 KB
Load time32 ms
Start3.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size26 KB
Load time26 ms
Start3.2 s
RiskFOUT — text flashes from fallback to web font
fa-brands-400.woff2woff2swap
Size116 KB
Load time33 ms
Start3.2 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
Size26 KB
Load time27 ms
Start3.2 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 ~198 KB and ~396 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
✓
Page uses 3 resource hint(s)
Current Resource Hints
preconnect
3
preload—
dns-prefetch—
prefetch—
3 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
111 requests over 7870ms
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-party6826ms · 1072KB · $91/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
2057ms
0 KB
—
$27/mo
Costly
www.ou.edu
www.ou.edu
Other
1334ms
33 KB
—
$18/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
636ms
172 KB
49%
$8/mo
Costly
www.ou.edu
www.ou.edu
Other
439ms
46 KB
77%
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
416ms
160 KB
40%
$6/mo
Costly
Google Analytics
www.google-analytics.com
Analytics
393ms
21 KB
—
$5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
273ms
129 KB
47%
$4/mo
Costly
www.ou.edu
www.ou.edu
Other
257ms
154 KB
71%
$3/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
216ms
97 KB
34%
$3/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
191ms
47 KB
—
$3/mo
Optional
Facebook Pixel
connect.facebook.net
Advertising
168ms
78 KB
70%
$2/mo
Optional
Twitter/X Embed
platform.twitter.com
Social
162ms
27 KB
—
$2/mo
Optional
cdnjs
cdnjs.cloudflare.com
CDN
145ms
4 KB
—
$2/mo
Optional
code.jquery.com
code.jquery.com
Other
84ms
30 KB
—
$1/mo
Optional
www.ou.edu
www.ou.edu
Other
57ms
75 KB
—
$1/mo
Optional
Unattributable
Other
Costly
Execution2057ms
Transfer0 KB
Monthly Cost$27/mo
www.ou.edu
Other
Costly
Execution1334ms
Transfer33 KB
Monthly Cost$18/mo
Google Tag Manager
Tag Manager
Costly
Execution636ms
Transfer172 KB
Unused49%
Monthly Cost$8/mo
www.ou.edu
Other
Costly
Execution439ms
Transfer46 KB
Unused77%
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution416ms
Transfer160 KB
Unused40%
Monthly Cost$6/mo
Google Analytics
Analytics
Costly
Execution393ms
Transfer21 KB
Monthly Cost$5/mo
Google Tag Manager
Tag Manager
Costly
Execution273ms
Transfer129 KB
Unused47%
Monthly Cost$4/mo
www.ou.edu
Other
Costly
Execution257ms
Transfer154 KB
Unused71%
Monthly Cost$3/mo
Facebook Pixel
Advertising
Costly
Execution216ms
Transfer97 KB
Unused34%
Monthly Cost$3/mo
Facebook Pixel
Advertising
Optional
Execution191ms
Transfer47 KB
Monthly Cost$3/mo
Facebook Pixel
Advertising
Optional
Execution168ms
Transfer78 KB
Unused70%
Monthly Cost$2/mo
Twitter/X Embed
Social
Optional
Execution162ms
Transfer27 KB
Monthly Cost$2/mo
cdnjs
CDN
Optional
Execution145ms
Transfer4 KB
Monthly Cost$2/mo
code.jquery.com
Other
Optional
Execution84ms
Transfer30 KB
Monthly Cost$1/mo
www.ou.edu
Other
Optional
Execution57ms
Transfer75 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
Unattributable adds 2057ms and costs ~$27/month
www.ou.edu adds 1334ms and costs ~$18/month
Google Tag Manager adds 636ms and costs ~$8/month
www.ou.edu adds 439ms and costs ~$6/month
Google Tag Manager adds 416ms and costs ~$6/month
Google Analytics adds 393ms and costs ~$5/month
Google Tag Manager adds 273ms and costs ~$4/month
www.ou.edu adds 257ms and costs ~$3/month
Facebook Pixel adds 216ms 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 2057ms 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.ou.edu takes 1334ms 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 636ms 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.ou.edu takes 439ms 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
77% of www.ou.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.
Source: web.dev
Google Tag Manager takes 416ms 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 Analytics takes 393ms 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 273ms 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.ou.edu takes 257ms 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
71% of www.ou.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.
Source: web.dev
Facebook Pixel takes 216ms 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
70% of Facebook Pixel'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.