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
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+
Font Loading
5 fonts (205 KB)
PASS
5 fonts (205 KB)
Info::
i
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
205 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
MayoClinicSans-Regular....woff2swap
Size38 KB
Load time21 ms
Start922 ms
RiskFOUT — text flashes from fallback to web font
MayoClinicSerif-Bold.woff2woff2swap
Size41 KB
Load time37 ms
Start923 ms
RiskFOUT — text flashes from fallback to web font
MayoClinicSans-Bold.woff2woff2swap
Size42 KB
Load time40 ms
Start924 ms
RiskFOUT — text flashes from fallback to web font
MayoClinicSerifDisplay-...woff2swap
Size43 KB
Load time58 ms
Start924 ms
RiskFOUT — text flashes from fallback to web font
MayoClinicSerifDisplay-...woff2swap
Size42 KB
Load time60 ms
Start924 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
✓
Page uses 2 resource hint(s)
Current Resource Hints
preconnect
1
preload
1
dns-prefetch—
prefetch—
2 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
105 requests over 5189ms
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-party10176ms · 710KB · $58/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.mayoclinic.org
www.mayoclinic.org
Other
1772ms
49 KB
52%
$10/mo
Costly
tagdelivery.mayoclinic.org
tagdelivery.mayoclinic.org
Other
1524ms
9 KB
—
$9/mo
Costly
Unattributable
Unattributable
Other
1215ms
0 KB
—
$7/mo
Costly
tagdelivery.mayoclinic.org
tagdelivery.mayoclinic.org
Other
1188ms
38 KB
—
$7/mo
Costly
www.mayoclinic.org
www.mayoclinic.org
Other
1054ms
1 KB
20%
$6/mo
Costly
www.mayoclinic.org
www.mayoclinic.org
Other
748ms
0 KB
—
$4/mo
Costly
www.mayoclinic.org
www.mayoclinic.org
Other
498ms
167 KB
24%
$3/mo
Costly
xih9lsprjt.kameleoon.io
xih9lsprjt.kameleoon.io
Other
425ms
72 KB
—
$2/mo
Costly
nexus.ensighten.com
nexus.ensighten.com
Other
361ms
74 KB
58%
$2/mo
Costly
tagdelivery.mayoclinic.org
tagdelivery.mayoclinic.org
Other
332ms
1 KB
—
$2/mo
Costly
assets.mayoclinic.org
assets.mayoclinic.org
Other
293ms
83 KB
46%
$2/mo
Costly
resources.digital-cloud-west.medallia.com
resources.digital-cloud-west.medallia.com
Other
265ms
86 KB
50%
$2/mo
Costly
s.go-mpulse.net
s.go-mpulse.net
Other
254ms
43 KB
—
$1/mo
Costly
transcend-cdn.com
transcend-cdn.com
Other
161ms
58 KB
47%
$1/mo
Optional
www.mayoclinic.org
www.mayoclinic.org
Other
86ms
27 KB
—
$0/mo
Optional
www.mayoclinic.org
Other
Costly
Execution1772ms
Transfer49 KB
Unused52%
Monthly Cost$10/mo
tagdelivery.mayoclinic.org
Other
Costly
Execution1524ms
Transfer9 KB
Monthly Cost$9/mo
Unattributable
Other
Costly
Execution1215ms
Transfer0 KB
Monthly Cost$7/mo
tagdelivery.mayoclinic.org
Other
Costly
Execution1188ms
Transfer38 KB
Monthly Cost$7/mo
www.mayoclinic.org
Other
Costly
Execution1054ms
Transfer1 KB
Unused20%
Monthly Cost$6/mo
www.mayoclinic.org
Other
Costly
Execution748ms
Transfer0 KB
Monthly Cost$4/mo
www.mayoclinic.org
Other
Costly
Execution498ms
Transfer167 KB
Unused24%
Monthly Cost$3/mo
xih9lsprjt.kameleoon.io
Other
Costly
Execution425ms
Transfer72 KB
Monthly Cost$2/mo
nexus.ensighten.com
Other
Costly
Execution361ms
Transfer74 KB
Unused58%
Monthly Cost$2/mo
tagdelivery.mayoclinic.org
Other
Costly
Execution332ms
Transfer1 KB
Monthly Cost$2/mo
assets.mayoclinic.org
Other
Costly
Execution293ms
Transfer83 KB
Unused46%
Monthly Cost$2/mo
resources.digital-cloud-west.medallia.com
Other
Costly
Execution265ms
Transfer86 KB
Unused50%
Monthly Cost$2/mo
s.go-mpulse.net
Other
Costly
Execution254ms
Transfer43 KB
Monthly Cost$1/mo
transcend-cdn.com
Other
Optional
Execution161ms
Transfer58 KB
Unused47%
Monthly Cost$1/mo
www.mayoclinic.org
Other
Optional
Execution86ms
Transfer27 KB
Monthly Cost$0/mo
These scripts may cost more than they're worth
www.mayoclinic.org adds 1772ms and costs ~$10/month
tagdelivery.mayoclinic.org adds 1524ms and costs ~$9/month
Unattributable adds 1215ms and costs ~$7/month
tagdelivery.mayoclinic.org adds 1188ms and costs ~$7/month
www.mayoclinic.org adds 1054ms and costs ~$6/month
www.mayoclinic.org adds 748ms and costs ~$4/month
www.mayoclinic.org adds 498ms and costs ~$3/month
xih9lsprjt.kameleoon.io adds 425ms and costs ~$2/month
nexus.ensighten.com adds 361ms and costs ~$2/month
tagdelivery.mayoclinic.org adds 332ms and costs ~$2/month
assets.mayoclinic.org adds 293ms and costs ~$2/month
resources.digital-cloud-west.medallia.com adds 265ms and costs ~$2/month
s.go-mpulse.net adds 254ms and costs ~$1/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.mayoclinic.org takes 1772ms 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 www.mayoclinic.org'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
tagdelivery.mayoclinic.org takes 1524ms 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 1215ms 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
tagdelivery.mayoclinic.org takes 1188ms 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.mayoclinic.org takes 1054ms 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.mayoclinic.org takes 748ms 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.mayoclinic.org takes 498ms 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
xih9lsprjt.kameleoon.io takes 425ms 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
nexus.ensighten.com takes 361ms 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 nexus.ensighten.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
tagdelivery.mayoclinic.org takes 332ms 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.mayoclinic.org takes 293ms 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
resources.digital-cloud-west.medallia.com takes 265ms 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 resources.digital-cloud-west.medallia.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
s.go-mpulse.net takes 254ms 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.