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
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
!
https://www.emory.edu/home/_includes/images/sectio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.emory.edu/home/_includes/images/sectio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/28316886?s=c17afa9... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/posts/507368468/images.j... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/28151988?s=855fe5a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/28151987?s=cb1e18b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.emory.edu/home/_includes/images/site-w... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/media/28240915?s=7b8a33d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.juicer.io/api/posts/507322351/images.j... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
26images11.9 MB
0oversized-0 KB
26legacy 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
7 fonts (434 KB)
PASS
7 fonts (434 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
434 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
notosans-regular-webfon...woffswap
Size22 KB
Load time27 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
fa-solid-900.woff2woff2swap
Size155 KB
Load time65 ms
Start1.6 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
q5uDsoa5M_tv7IihmnkabAR...woff2swap
Size47 KB
Load time15 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
spectral-regular-webfon...woffswap
Size29 KB
Load time30 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
memvYaGs126MiZpBA-UvWbX...woff2swap
Size42 KB
Load time24 ms
Start1.6 s
RiskFOUT — text flashes from fallback to web font
fa-brands-400.woff2woff2swap
Size116 KB
Load time64 ms
Start1.6 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
memvYaGs126MiZpBA-UvWbX...woff2swap
Size22 KB
Load time18 ms
Start2.9 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 ~151 KB and ~302 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
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
Network Waterfall
130 requests over 4424ms
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-party8127ms · 1685KB · €88/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
1785ms
0 KB
—
€19/mo
Costly
www.emory.edu
www.emory.edu
Other
1298ms
58 KB
—
€14/mo
Costly
Hotjar
script.hotjar.com
Session Replay
789ms
57 KB
46%
€9/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
555ms
130 KB
42%
€6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
544ms
173 KB
39%
€6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
504ms
154 KB
41%
€5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
437ms
145 KB
50%
€5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
408ms
116 KB
53%
€4/mo
Costly
code.jquery.com
code.jquery.com
Other
334ms
30 KB
—
€4/mo
Costly
analytics.tiktok.com
analytics.tiktok.com
Other
318ms
117 KB
57%
€3/mo
Costly
Twitter/X Embed
platform.twitter.com
Social
279ms
27 KB
—
€3/mo
Costly
template.emory.edu
template.emory.edu
Other
246ms
393 KB
58%
€3/mo
Costly
sc-static.net
sc-static.net
Other
216ms
25 KB
—
€2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
137ms
173 KB
66%
€1/mo
Optional
Google Analytics
www.google-analytics.com
Analytics
88ms
21 KB
—
€1/mo
Optional
analytics.tiktok.com
analytics.tiktok.com
Other
73ms
40 KB
—
€1/mo
Optional
siteimproveanalytics.com
siteimproveanalytics.com
Other
64ms
13 KB
—
€1/mo
Optional
secure.quantserve.com
secure.quantserve.com
Other
53ms
12 KB
—
€1/mo
Optional
Unattributable
Other
Costly
Execution1785ms
Transfer0 KB
Monthly Cost€19/mo
www.emory.edu
Other
Costly
Execution1298ms
Transfer58 KB
Monthly Cost€14/mo
Hotjar
Session Replay
Costly
Execution789ms
Transfer57 KB
Unused46%
Monthly Cost€9/mo
Google Tag Manager
Tag Manager
Costly
Execution555ms
Transfer130 KB
Unused42%
Monthly Cost€6/mo
Google Tag Manager
Tag Manager
Costly
Execution544ms
Transfer173 KB
Unused39%
Monthly Cost€6/mo
Google Tag Manager
Tag Manager
Costly
Execution504ms
Transfer154 KB
Unused41%
Monthly Cost€5/mo
Google Tag Manager
Tag Manager
Costly
Execution437ms
Transfer145 KB
Unused50%
Monthly Cost€5/mo
Google Tag Manager
Tag Manager
Costly
Execution408ms
Transfer116 KB
Unused53%
Monthly Cost€4/mo
code.jquery.com
Other
Costly
Execution334ms
Transfer30 KB
Monthly Cost€4/mo
analytics.tiktok.com
Other
Costly
Execution318ms
Transfer117 KB
Unused57%
Monthly Cost€3/mo
Twitter/X Embed
Social
Costly
Execution279ms
Transfer27 KB
Monthly Cost€3/mo
template.emory.edu
Other
Costly
Execution246ms
Transfer393 KB
Unused58%
Monthly Cost€3/mo
sc-static.net
Other
Costly
Execution216ms
Transfer25 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution137ms
Transfer173 KB
Unused66%
Monthly Cost€1/mo
Google Analytics
Analytics
Optional
Execution88ms
Transfer21 KB
Monthly Cost€1/mo
analytics.tiktok.com
Other
Optional
Execution73ms
Transfer40 KB
Monthly Cost€1/mo
siteimproveanalytics.com
Other
Optional
Execution64ms
Transfer13 KB
Monthly Cost€1/mo
secure.quantserve.com
Other
Optional
Execution53ms
Transfer12 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
Unattributable adds 1785ms and costs ~€19/month
www.emory.edu adds 1298ms and costs ~€14/month
Hotjar adds 789ms and costs ~€9/month
Google Tag Manager adds 555ms and costs ~€6/month
Google Tag Manager adds 544ms and costs ~€6/month
Google Tag Manager adds 504ms and costs ~€5/month
Google Tag Manager adds 437ms and costs ~€5/month
Google Tag Manager adds 408ms and costs ~€4/month
code.jquery.com adds 334ms and costs ~€4/month
analytics.tiktok.com adds 318ms and costs ~€3/month
Twitter/X Embed adds 279ms and costs ~€3/month
template.emory.edu adds 246ms and costs ~€3/month
sc-static.net adds 216ms and costs ~€2/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 1785ms 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.emory.edu takes 1298ms 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
Hotjar takes 789ms 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 555ms 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 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 504ms 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 437ms 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
50% 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 408ms 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
53% 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
code.jquery.com takes 334ms 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
analytics.tiktok.com takes 318ms 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
57% of analytics.tiktok.com'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
Twitter/X Embed 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
template.emory.edu takes 246ms 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
58% of template.emory.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
sc-static.net 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
66% 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.