Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
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+
Image Optimization
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Warning::
!
data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4images351 KB
0oversized-0 KB
0legacy format
1missing 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
A+
Font Loading
4 fonts (91 KB)
PASS
4 fonts (91 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
91 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
font-woff2;charset=utf-...woff2swap
Size23 KB
Load time6 ms
Start660 ms
RiskFOUT — text flashes from fallback to web font
font-woff2;charset=utf-...woff2swap
Size23 KB
Load time4 ms
Start663 ms
RiskFOUT — text flashes from fallback to web font
font-woff2;charset=utf-...woff2swap
Size23 KB
Load time168 ms
Start2.4 s
RiskFOUT — text flashes from fallback to web font
font-woff2;charset=utf-...woff2swap
Size22 KB
Load time6 ms
Start3.3 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
Network Waterfall
74 requests over 4680ms
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-party1224ms · 463KB · $16/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.uic.edu
www.uic.edu
Other
535ms
38 KB
—
$7/mo
Costly
www.uic.edu
www.uic.edu
Other
272ms
31 KB
—
$4/mo
Costly
Unattributable
Unattributable
Other
152ms
0 KB
—
$2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
139ms
128 KB
51%
$2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
73ms
179 KB
38%
$1/mo
Optional
www.uic.edu
www.uic.edu
Other
53ms
87 KB
45%
$1/mo
Optional
www.uic.edu
Other
Costly
Execution535ms
Transfer38 KB
Monthly Cost$7/mo
www.uic.edu
Other
Costly
Execution272ms
Transfer31 KB
Monthly Cost$4/mo
Unattributable
Other
Optional
Execution152ms
Transfer0 KB
Monthly Cost$2/mo
Google Tag Manager
Tag Manager
Optional
Execution139ms
Transfer128 KB
Unused51%
Monthly Cost$2/mo
Google Tag Manager
Tag Manager
Optional
Execution73ms
Transfer179 KB
Unused38%
Monthly Cost$1/mo
www.uic.edu
Other
Optional
Execution53ms
Transfer87 KB
Unused45%
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.uic.edu adds 535ms and costs ~$7/month
www.uic.edu adds 272ms 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
www.uic.edu takes 535ms 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.uic.edu takes 272ms 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
51% 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.