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
37 images, 0 KB saveable
REVIEW
37 images, 0 KB saveable
Warning::
!
https://www.clemson.edu/_images/home/campus-life/r... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.clemson.edu/_images/home/research/ebne... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://media.clemson.edu/ows/homepage/image_btns/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.clemson.edu/_images/home/campus-life/r... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.clemson.edu/_ows_includes/src/styles/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://media.clemson.edu/ows/homepage/image_btns/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://media.clemson.edu/ows/homepage/image_btns/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://media.clemson.edu/ows/homepage/image_btns/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.clemson.edu/_images/home/academics/sea... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
37images3.1 MB
0oversized-0 KB
12legacy 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
27 fonts (987 KB)
PASS
27 fonts (987 KB)
Info::
i
27 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
27
987 KB total
Render-blocking
0
of 27
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
tiempos-headline-web-se...woff2swap
Size41 KB
Load time528 ms
Start999 ms
RiskFOUT — text flashes from fallback to web font
tiempos-headline-web-se...woff2swap
Size42 KB
Load time530 ms
Start999 ms
RiskFOUT — text flashes from fallback to web font
tiempos-headline-web-bo...woff2swap
Size41 KB
Load time532 ms
Start1000 ms
RiskFOUT — text flashes from fallback to web font
tiempos-headline-web-bo...woff2swap
Size43 KB
Load time535 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
tiempos-headline-web-bl...woff2swap
Size41 KB
Load time397 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
tiempos-text-web-semibo...woff2swap
Size57 KB
Load time630 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
tiempos-text-web-bold.w...woff2swap
Size56 KB
Load time746 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
la-regular-400.woff2woff2swap
Size13 KB
Load time637 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
la-solid-900.woff2woff2swap
Size95 KB
Load time845 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
la-brands-400.woff2woff2swap
Size83 KB
Load time747 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
custom-clemson-icons.woffwoffswap
Size46 KB
Load time738 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
lwoff2swap
Size19 KB
Load time17 ms
Start1.9 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size19 KB
Load time12 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
tiempos-headline-web-li...woff2swap
Size48 KB
Load time122 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size20 KB
Load time28 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size20 KB
Load time28 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size19 KB
Load time39 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
custom-clemson-icons.ttfttfswap
Size27 KB
Load time200 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
lwoff2swap
Size20 KB
Load time26 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size20 KB
Load time28 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
tiempos-headline-web-me...woff2swap
Size41 KB
Load time194 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size20 KB
Load time29 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
tiempos-headline-web-re...woff2swap
Size43 KB
Load time233 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time15 ms
Start2.4 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size19 KB
Load time26 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size20 KB
Load time33 ms
Start2.8 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size39 KB
Load time20 ms
Start3.5 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 ~22 KB and ~44 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
11 hints, 0 missing preconnects
PASS
11 hints, 0 missing preconnects
Info::
✓
Page uses 11 resource hint(s)
Current Resource Hints
preconnect—
preload
+1
11
dns-prefetch—
prefetch—
11 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
144 requests over 8008ms
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-party9557ms · 1284KB · $127/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
2268ms
0 KB
—
$30/mo
Costly
www.clemson.edu
www.clemson.edu
Other
1787ms
91 KB
—
$24/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
1183ms
171 KB
36%
$16/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
604ms
165 KB
34%
$8/mo
Costly
www.clemson.edu
www.clemson.edu
Other
494ms
154 KB
63%
$7/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
482ms
97 KB
35%
$6/mo
Costly
www.clemson.edu
www.clemson.edu
Other
438ms
164 KB
—
$6/mo
Costly
www.clemson.edu
www.clemson.edu
Other
416ms
19 KB
—
$6/mo
Costly
Microsoft Clarity
scripts.clarity.ms
Session Replay
411ms
26 KB
—
$5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
321ms
129 KB
47%
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
293ms
137 KB
49%
$4/mo
Costly
sc-static.net
sc-static.net
Other
228ms
25 KB
—
$3/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
213ms
45 KB
—
$3/mo
Costly
events.clemson.edu
events.clemson.edu
Other
153ms
36 KB
—
$2/mo
Optional
www.clemson.edu
www.clemson.edu
Other
114ms
3 KB
—
$2/mo
Optional
js.adsrvr.org
js.adsrvr.org
Other
91ms
12 KB
—
$1/mo
Optional
www.youtube.com
www.youtube.com
Other
63ms
11 KB
—
$1/mo
Optional
Unattributable
Other
Costly
Execution2268ms
Transfer0 KB
Monthly Cost$30/mo
www.clemson.edu
Other
Costly
Execution1787ms
Transfer91 KB
Monthly Cost$24/mo
Google Tag Manager
Tag Manager
Costly
Execution1183ms
Transfer171 KB
Unused36%
Monthly Cost$16/mo
Google Tag Manager
Tag Manager
Costly
Execution604ms
Transfer165 KB
Unused34%
Monthly Cost$8/mo
www.clemson.edu
Other
Costly
Execution494ms
Transfer154 KB
Unused63%
Monthly Cost$7/mo
Facebook Pixel
Advertising
Costly
Execution482ms
Transfer97 KB
Unused35%
Monthly Cost$6/mo
www.clemson.edu
Other
Costly
Execution438ms
Transfer164 KB
Monthly Cost$6/mo
www.clemson.edu
Other
Costly
Execution416ms
Transfer19 KB
Monthly Cost$6/mo
Microsoft Clarity
Session Replay
Costly
Execution411ms
Transfer26 KB
Monthly Cost$5/mo
Google Tag Manager
Tag Manager
Costly
Execution321ms
Transfer129 KB
Unused47%
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution293ms
Transfer137 KB
Unused49%
Monthly Cost$4/mo
sc-static.net
Other
Costly
Execution228ms
Transfer25 KB
Monthly Cost$3/mo
Facebook Pixel
Advertising
Costly
Execution213ms
Transfer45 KB
Monthly Cost$3/mo
events.clemson.edu
Other
Optional
Execution153ms
Transfer36 KB
Monthly Cost$2/mo
www.clemson.edu
Other
Optional
Execution114ms
Transfer3 KB
Monthly Cost$2/mo
js.adsrvr.org
Other
Optional
Execution91ms
Transfer12 KB
Monthly Cost$1/mo
www.youtube.com
Other
Optional
Execution63ms
Transfer11 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
Unattributable adds 2268ms and costs ~$30/month
www.clemson.edu adds 1787ms and costs ~$24/month
Google Tag Manager adds 1183ms and costs ~$16/month
Google Tag Manager adds 604ms and costs ~$8/month
www.clemson.edu adds 494ms and costs ~$7/month
Facebook Pixel adds 482ms and costs ~$6/month
www.clemson.edu adds 438ms and costs ~$6/month
www.clemson.edu adds 416ms and costs ~$6/month
Microsoft Clarity adds 411ms and costs ~$5/month
Google Tag Manager adds 321ms and costs ~$4/month
Google Tag Manager adds 293ms and costs ~$4/month
sc-static.net adds 228ms and costs ~$3/month
Facebook Pixel adds 213ms 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 2268ms 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.clemson.edu takes 1787ms 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 1183ms 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 604ms 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.clemson.edu takes 494ms 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
63% of www.clemson.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 482ms 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.clemson.edu takes 438ms 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.clemson.edu 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
Microsoft Clarity takes 411ms 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 321ms 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 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
sc-static.net takes 228ms 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 213ms 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.