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
48 images, 0 KB saveable
REVIEW
48 images, 0 KB saveable
Warning::
!
https://www.juicer.io/api/media/28082764?s=7db95d9... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/27309542?s=1e315d2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/25160445?s=6ea37aa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.georgetown.edu/wp-content/uploads/2025... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.georgetown.edu/wp-content/uploads/2025... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/26937023?s=7ba84b6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/26553288?s=be26367... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/26486368?s=2a82ac2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.georgetown.edu/wp-content/uploads/2023... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/28220707?s=34f843d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/26829777?s=4ec6578... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/25240287?s=f9039b1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/24559784?s=b2bf266... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/27229307?s=60ad255... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/25754192?s=b9b41a9... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
48images5.2 MB
0oversized-0 KB
38legacy format
15missing 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
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
7 fonts (376 KB)
PASS
7 fonts (376 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
376 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
lwoff2swap
Size95 KB
Load time11 ms
Start445 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size96 KB
Load time13 ms
Start448 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size51 KB
Load time8 ms
Start448 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size46 KB
Load time5 ms
Start448 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size37 KB
Load time10 ms
Start448 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size42 KB
Load time15 ms
Start917 ms
RiskFOUT — text flashes from fallback to web font
fontawesome-5-juicer.woff2woff2swap
Size10 KB
Load time104 ms
Start917 ms
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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
✓
Page uses 1 resource hint(s)
Current Resource Hints
preconnect—
preload—
dns-prefetch
1
prefetch—
1 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
100 requests over 1642ms
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-party3775ms · 1131KB · $50/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
619ms
0 KB
—
$8/mo
Costly
www.juicer.io
www.juicer.io
Other
514ms
119 KB
72%
$7/mo
Costly
www.georgetown.edu
www.georgetown.edu
Other
470ms
86 KB
76%
$6/mo
Costly
www.georgetown.edu
www.georgetown.edu
Other
442ms
53 KB
—
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
417ms
177 KB
39%
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
279ms
157 KB
42%
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
276ms
157 KB
52%
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
270ms
172 KB
41%
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
242ms
156 KB
43%
$3/mo
Costly
www.georgetown.edu
www.georgetown.edu
Other
149ms
35 KB
—
$2/mo
Optional
js-agent.newrelic.com
js-agent.newrelic.com
Other
97ms
19 KB
—
$1/mo
Optional
Unattributable
Other
Costly
Execution619ms
Transfer0 KB
Monthly Cost$8/mo
www.juicer.io
Other
Costly
Execution514ms
Transfer119 KB
Unused72%
Monthly Cost$7/mo
www.georgetown.edu
Other
Costly
Execution470ms
Transfer86 KB
Unused76%
Monthly Cost$6/mo
www.georgetown.edu
Other
Costly
Execution442ms
Transfer53 KB
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution417ms
Transfer177 KB
Unused39%
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution279ms
Transfer157 KB
Unused42%
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution276ms
Transfer157 KB
Unused52%
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution270ms
Transfer172 KB
Unused41%
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution242ms
Transfer156 KB
Unused43%
Monthly Cost$3/mo
www.georgetown.edu
Other
Optional
Execution149ms
Transfer35 KB
Monthly Cost$2/mo
js-agent.newrelic.com
Other
Optional
Execution97ms
Transfer19 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
Unattributable adds 619ms and costs ~$8/month
www.juicer.io adds 514ms and costs ~$7/month
www.georgetown.edu adds 470ms and costs ~$6/month
www.georgetown.edu adds 442ms and costs ~$6/month
Google Tag Manager adds 417ms and costs ~$6/month
Google Tag Manager adds 279ms and costs ~$4/month
Google Tag Manager adds 276ms and costs ~$4/month
Google Tag Manager adds 270ms and costs ~$4/month
Google Tag Manager adds 242ms 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 619ms 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.juicer.io 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
72% of www.juicer.io'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
www.georgetown.edu takes 470ms 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
76% of www.georgetown.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
www.georgetown.edu 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
Google Tag Manager takes 417ms 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 279ms 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 276ms 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
52% 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.
Source: web.dev
Google Tag Manager takes 270ms 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 242ms 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.