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
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
!
https://www.educause.edu/assets/images/Social%20Ic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.educause.edu/assets/images/Social%20Ic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.educause.edu/assets/images/Social%20Ic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.educause.edu/assets/images/Social%20Ic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20images913 KB
0oversized-0 KB
9legacy 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
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
6 fonts (87 KB)
PASS
6 fonts (87 KB)
Info::
i
6 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
6
87 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
NGS6v5_NC0k9P9H2TbFhsqM...woff2swap
Size29 KB
Load time22 ms
Start902 ms
RiskFOUT — text flashes from fallback to web font
OpNPnoEOns3V7G-1ixvTpi9...woff2swap
Size6 KB
Load time15 ms
Start903 ms
RiskFOUT — text flashes from fallback to web font
OpNCnoEOns3V7GcOrg7-hCJ...woff2swap
Size6 KB
Load time21 ms
Start904 ms
RiskFOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9...woff2swap
Size45 KB
Load time18 ms
Start904 ms
RiskFOUT — text flashes from fallback to web font
slick.woffwoffswap
Size0 KB
Load time121 ms
Start917 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
slick.ttfttfswap
Size0 KB
Load time100 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall
74 requests over 2553ms
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-party4361ms · 1208KB · $58/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Optimizely
cdn.optimizely.com
A/B Testing
600ms
127 KB
43%
$8/mo
Costly
www.educause.edu
www.educause.edu
Other
544ms
34 KB
—
$7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
514ms
155 KB
41%
$7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
512ms
173 KB
39%
$7/mo
Costly
Unattributable
Unattributable
Other
442ms
0 KB
—
$6/mo
Costly
www.educause.edu
www.educause.edu
Other
400ms
35 KB
—
$5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
277ms
147 KB
44%
$4/mo
Costly
Google Analytics
www.google-analytics.com
Analytics
192ms
21 KB
—
$3/mo
Optional
js-agent.newrelic.com
js-agent.newrelic.com
Other
177ms
30 KB
—
$2/mo
Optional
cdn.feathr.co
cdn.feathr.co
Other
132ms
42 KB
—
$2/mo
Optional
cltgtstor001.blob.core.windows.net
cltgtstor001.blob.core.windows.net
Other
122ms
45 KB
71%
$2/mo
Optional
i.snoball.it
i.snoball.it
Other
107ms
66 KB
76%
$1/mo
Optional
www.educause.edu
www.educause.edu
Other
105ms
59 KB
56%
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
98ms
173 KB
65%
$1/mo
Optional
www.educause.edu
www.educause.edu
Other
74ms
73 KB
30%
$1/mo
Optional
siteimproveanalytics.com
siteimproveanalytics.com
Other
63ms
27 KB
—
$1/mo
Optional
Optimizely
A/B Testing
Costly
Execution600ms
Transfer127 KB
Unused43%
Monthly Cost$8/mo
www.educause.edu
Other
Costly
Execution544ms
Transfer34 KB
Monthly Cost$7/mo
Google Tag Manager
Tag Manager
Costly
Execution514ms
Transfer155 KB
Unused41%
Monthly Cost$7/mo
Google Tag Manager
Tag Manager
Costly
Execution512ms
Transfer173 KB
Unused39%
Monthly Cost$7/mo
Unattributable
Other
Costly
Execution442ms
Transfer0 KB
Monthly Cost$6/mo
www.educause.edu
Other
Costly
Execution400ms
Transfer35 KB
Monthly Cost$5/mo
Google Tag Manager
Tag Manager
Costly
Execution277ms
Transfer147 KB
Unused44%
Monthly Cost$4/mo
Google Analytics
Analytics
Optional
Execution192ms
Transfer21 KB
Monthly Cost$3/mo
js-agent.newrelic.com
Other
Optional
Execution177ms
Transfer30 KB
Monthly Cost$2/mo
cdn.feathr.co
Other
Optional
Execution132ms
Transfer42 KB
Monthly Cost$2/mo
cltgtstor001.blob.core.windows.net
Other
Optional
Execution122ms
Transfer45 KB
Unused71%
Monthly Cost$2/mo
i.snoball.it
Other
Optional
Execution107ms
Transfer66 KB
Unused76%
Monthly Cost$1/mo
www.educause.edu
Other
Optional
Execution105ms
Transfer59 KB
Unused56%
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution98ms
Transfer173 KB
Unused65%
Monthly Cost$1/mo
www.educause.edu
Other
Optional
Execution74ms
Transfer73 KB
Unused30%
Monthly Cost$1/mo
siteimproveanalytics.com
Other
Optional
Execution63ms
Transfer27 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
Optimizely adds 600ms and costs ~$8/month
www.educause.edu adds 544ms and costs ~$7/month
Google Tag Manager adds 514ms and costs ~$7/month
Google Tag Manager adds 512ms and costs ~$7/month
Unattributable adds 442ms and costs ~$6/month
www.educause.edu adds 400ms and costs ~$5/month
Google Tag Manager adds 277ms and costs ~$4/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
Optimizely takes 600ms 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.educause.edu takes 544ms 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 514ms 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 512ms 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 442ms 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.educause.edu takes 400ms 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 277ms 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 cltgtstor001.blob.core.windows.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
76% of i.snoball.it'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
56% of www.educause.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
65% 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.