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
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/H... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/M... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/M... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/G... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/G... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/G... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/G... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/G... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/M... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/M... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/G... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/H... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/H... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.mountsinai.org/files/MSHealth/Assets/G... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
28images4.0 MB
0oversized-0 KB
27legacy format
14missing 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
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
6 fonts (454 KB)
PASS
6 fonts (454 KB)
Info::
i
6 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
6
454 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
fontawesome-webfont.woff2woff2swap
Size65 KB
Load time35 ms
Start7.6 s
RiskFOUT — text flashes from fallback to web font
MountSinai-SansVF_W_Wdt...woff2swap
Size65 KB
Load time30 ms
Start7.6 s
RiskFOUT — text flashes from fallback to web font
fa-brands-400.woff2woff2swap
Size116 KB
Load time20 ms
Start7.7 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
MountSinai-SansVF_W_Wdt...woff2swap
Size65 KB
Load time69 ms
Start8.6 s
RiskFOUT — text flashes from fallback to web font
MountSinai-SansVFItalic...woff2swap
Size71 KB
Load time65 ms
Start8.6 s
RiskFOUT — text flashes from fallback to web font
MountSinai-SansVFItalic...woff2swap
Size71 KB
Load time29 ms
Start10.9 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 ~58 KB and ~116 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
178 requests over 14066ms
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-party19581ms · 1882KB · $306/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.mountsinai.org
www.mountsinai.org
Other
4639ms
33 KB
—
$73/mo
Costly
s.go-mpulse.net
s.go-mpulse.net
Other
2937ms
0 KB
70%
$46/mo
Costly
ajax.googleapis.com
ajax.googleapis.com
Other
2307ms
30 KB
—
$36/mo
Costly
mountsinai.containers.piwik.pro
mountsinai.containers.piwik.pro
Other
2174ms
0 KB
14%
$34/mo
Costly
Unattributable
Unattributable
Other
1463ms
0 KB
—
$23/mo
Costly
assets.sitescdn.net
assets.sitescdn.net
Other
1203ms
1039 KB
16%
$19/mo
Costly
web-2-tel.com
web-2-tel.com
Other
675ms
6 KB
—
$11/mo
Costly
doctor.mountsinai.org
doctor.mountsinai.org
Other
585ms
37 KB
—
$9/mo
Costly
js-agent.newrelic.com
js-agent.newrelic.com
Other
507ms
30 KB
—
$8/mo
Costly
jsSdk.js
jsSdk.js
Other
452ms
0 KB
—
$7/mo
Costly
doctor.mountsinai.org
doctor.mountsinai.org
Other
307ms
33 KB
—
$5/mo
Costly
translate.googleapis.com
translate.googleapis.com
Other
307ms
119 KB
78%
$5/mo
Costly
doctor.mountsinai.org
doctor.mountsinai.org
Other
259ms
56 KB
—
$4/mo
Costly
ide.user1st.info
ide.user1st.info
Other
251ms
95 KB
59%
$4/mo
Costly
www.mountsinai.org
www.mountsinai.org
Other
200ms
1 KB
—
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
193ms
140 KB
41%
$3/mo
Optional
js-agent.newrelic.com
js-agent.newrelic.com
Other
180ms
19 KB
—
$3/mo
Optional
cdn.penrod.co
cdn.penrod.co
Other
154ms
0 KB
—
$2/mo
Optional
mountsinai.containers.piwik.pro
mountsinai.containers.piwik.pro
Other
147ms
0 KB
—
$2/mo
Optional
ajax.googleapis.com
ajax.googleapis.com
Other
134ms
32 KB
67%
$2/mo
Optional
doctor.mountsinai.org
doctor.mountsinai.org
Other
126ms
15 KB
—
$2/mo
Optional
ufe.user1st.info
ufe.user1st.info
Other
119ms
42 KB
68%
$2/mo
Optional
assets.sitescdn.net
assets.sitescdn.net
Other
98ms
52 KB
82%
$2/mo
Optional
mountsinaiassetsbucket.s3.us-west-1.amazonaws.com
mountsinaiassetsbucket.s3.us-west-1.amazonaws.com
Other
89ms
4 KB
—
$1/mo
Optional
h1.avaamo.com
h1.avaamo.com
Other
76ms
98 KB
22%
$1/mo
Optional
www.mountsinai.org
Other
Costly
Execution4639ms
Transfer33 KB
Monthly Cost$73/mo
s.go-mpulse.net
Other
Costly
Execution2937ms
Transfer0 KB
Unused70%
Monthly Cost$46/mo
ajax.googleapis.com
Other
Costly
Execution2307ms
Transfer30 KB
Monthly Cost$36/mo
mountsinai.containers.piwik.pro
Other
Costly
Execution2174ms
Transfer0 KB
Unused14%
Monthly Cost$34/mo
Unattributable
Other
Costly
Execution1463ms
Transfer0 KB
Monthly Cost$23/mo
assets.sitescdn.net
Other
Costly
Execution1203ms
Transfer1039 KB
Unused16%
Monthly Cost$19/mo
web-2-tel.com
Other
Costly
Execution675ms
Transfer6 KB
Monthly Cost$11/mo
doctor.mountsinai.org
Other
Costly
Execution585ms
Transfer37 KB
Monthly Cost$9/mo
js-agent.newrelic.com
Other
Costly
Execution507ms
Transfer30 KB
Monthly Cost$8/mo
jsSdk.js
Other
Costly
Execution452ms
Transfer0 KB
Monthly Cost$7/mo
doctor.mountsinai.org
Other
Costly
Execution307ms
Transfer33 KB
Monthly Cost$5/mo
translate.googleapis.com
Other
Costly
Execution307ms
Transfer119 KB
Unused78%
Monthly Cost$5/mo
doctor.mountsinai.org
Other
Costly
Execution259ms
Transfer56 KB
Monthly Cost$4/mo
ide.user1st.info
Other
Costly
Execution251ms
Transfer95 KB
Unused59%
Monthly Cost$4/mo
www.mountsinai.org
Other
Costly
Execution200ms
Transfer1 KB
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Optional
Execution193ms
Transfer140 KB
Unused41%
Monthly Cost$3/mo
js-agent.newrelic.com
Other
Optional
Execution180ms
Transfer19 KB
Monthly Cost$3/mo
cdn.penrod.co
Other
Optional
Execution154ms
Transfer0 KB
Monthly Cost$2/mo
mountsinai.containers.piwik.pro
Other
Optional
Execution147ms
Transfer0 KB
Monthly Cost$2/mo
ajax.googleapis.com
Other
Optional
Execution134ms
Transfer32 KB
Unused67%
Monthly Cost$2/mo
doctor.mountsinai.org
Other
Optional
Execution126ms
Transfer15 KB
Monthly Cost$2/mo
ufe.user1st.info
Other
Optional
Execution119ms
Transfer42 KB
Unused68%
Monthly Cost$2/mo
assets.sitescdn.net
Other
Optional
Execution98ms
Transfer52 KB
Unused82%
Monthly Cost$2/mo
mountsinaiassetsbucket.s3.us-west-1.amazonaws.com
Other
Optional
Execution89ms
Transfer4 KB
Monthly Cost$1/mo
h1.avaamo.com
Other
Optional
Execution76ms
Transfer98 KB
Unused22%
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.mountsinai.org adds 4639ms and costs ~$73/month
s.go-mpulse.net adds 2937ms and costs ~$46/month
ajax.googleapis.com adds 2307ms and costs ~$36/month
mountsinai.containers.piwik.pro adds 2174ms and costs ~$34/month
Unattributable adds 1463ms and costs ~$23/month
assets.sitescdn.net adds 1203ms and costs ~$19/month
web-2-tel.com adds 675ms and costs ~$11/month
doctor.mountsinai.org adds 585ms and costs ~$9/month
js-agent.newrelic.com adds 507ms and costs ~$8/month
jsSdk.js adds 452ms and costs ~$7/month
doctor.mountsinai.org adds 307ms and costs ~$5/month
translate.googleapis.com adds 307ms and costs ~$5/month
doctor.mountsinai.org adds 259ms and costs ~$4/month
ide.user1st.info adds 251ms and costs ~$4/month
www.mountsinai.org adds 200ms 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
www.mountsinai.org takes 4639ms 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
s.go-mpulse.net takes 2937ms 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
70% of s.go-mpulse.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
ajax.googleapis.com takes 2307ms 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
mountsinai.containers.piwik.pro takes 2174ms 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 1463ms 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
assets.sitescdn.net takes 1203ms 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
web-2-tel.com takes 675ms 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
doctor.mountsinai.org takes 585ms 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
js-agent.newrelic.com takes 507ms 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
jsSdk.js takes 452ms 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
doctor.mountsinai.org takes 307ms 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
translate.googleapis.com takes 307ms 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
78% of translate.googleapis.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
doctor.mountsinai.org takes 259ms 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
ide.user1st.info takes 251ms 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
59% of ide.user1st.info'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.mountsinai.org takes 200ms 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
67% of ajax.googleapis.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
68% of ufe.user1st.info'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
82% of assets.sitescdn.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.