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
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Warning::
!
https://www.cisco.com/content/dam/cisco-cdc/site/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.cisco.com/content/dam/cisco-cdc/site/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.cisco.com/content/dam/cisco-cdc/site/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.cisco.com/content/dam/cisco-cdc/site/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.cisco.com/content/dam/cisco-cdc/site/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.cisco.com/content/dam/cisco-cdc/site/c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
44images2.8 MB
0oversized-0 KB
24legacy format
6missing 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
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
2 fonts (96 KB)
PASS
2 fonts (96 KB)
Info::
i
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
96 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
UcC73FwrK3iLTeHuS_nVMrM...woff2swap
Size47 KB
Load time9 ms
Start935 ms
RiskFOUT — text flashes from fallback to web font
inter-latin-variable.woff2woff2swap
Size48 KB
Load time15 ms
Start1.1 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
9 hints, 0 missing preconnects
PASS
9 hints, 0 missing preconnects
Info::
✓
Page uses 9 resource hint(s)
Current Resource Hints
preconnect
5
preload
1
dns-prefetch
3
prefetch—
9 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
108 requests over 2830ms
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-party8225ms · 1180KB · $109/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.cisco.com
www.cisco.com
Other
2203ms
32 KB
—
$29/mo
Costly
virtualconcierge.cisco.com
virtualconcierge.cisco.com
Other
1329ms
643 KB
76%
$18/mo
Costly
Unattributable
Unattributable
Other
1176ms
0 KB
—
$16/mo
Costly
www.cisco.com
www.cisco.com
Other
909ms
93 KB
49%
$12/mo
Costly
OneTrust
cdn.cookielaw.org
Consent
678ms
127 KB
53%
$9/mo
Essential
www.cisco.com
www.cisco.com
Other
575ms
64 KB
67%
$8/mo
Costly
www.cisco.com
www.cisco.com
Other
304ms
2 KB
—
$4/mo
Costly
s.go-mpulse.net
s.go-mpulse.net
Other
282ms
57 KB
41%
$4/mo
Costly
tags.tiqcdn.com
tags.tiqcdn.com
Other
247ms
76 KB
41%
$3/mo
Costly
www.cisco.com
www.cisco.com
Other
160ms
24 KB
—
$2/mo
Optional
www.cisco.com
www.cisco.com
Other
109ms
22 KB
—
$1/mo
Optional
www.cisco.com
www.cisco.com
Other
77ms
11 KB
—
$1/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
66ms
9 KB
—
$1/mo
Essential
www.cisco.com
www.cisco.com
Other
54ms
8 KB
—
$1/mo
Optional
www.cisco.com
www.cisco.com
Other
53ms
12 KB
—
$1/mo
Optional
www.cisco.com
Other
Costly
Execution2203ms
Transfer32 KB
Monthly Cost$29/mo
virtualconcierge.cisco.com
Other
Costly
Execution1329ms
Transfer643 KB
Unused76%
Monthly Cost$18/mo
Unattributable
Other
Costly
Execution1176ms
Transfer0 KB
Monthly Cost$16/mo
www.cisco.com
Other
Costly
Execution909ms
Transfer93 KB
Unused49%
Monthly Cost$12/mo
OneTrust
Consent
Essential
Execution678ms
Transfer127 KB
Unused53%
Monthly Cost$9/mo
www.cisco.com
Other
Costly
Execution575ms
Transfer64 KB
Unused67%
Monthly Cost$8/mo
www.cisco.com
Other
Costly
Execution304ms
Transfer2 KB
Monthly Cost$4/mo
s.go-mpulse.net
Other
Costly
Execution282ms
Transfer57 KB
Unused41%
Monthly Cost$4/mo
tags.tiqcdn.com
Other
Costly
Execution247ms
Transfer76 KB
Unused41%
Monthly Cost$3/mo
www.cisco.com
Other
Optional
Execution160ms
Transfer24 KB
Monthly Cost$2/mo
www.cisco.com
Other
Optional
Execution109ms
Transfer22 KB
Monthly Cost$1/mo
www.cisco.com
Other
Optional
Execution77ms
Transfer11 KB
Monthly Cost$1/mo
OneTrust
Consent
Essential
Execution66ms
Transfer9 KB
Monthly Cost$1/mo
www.cisco.com
Other
Optional
Execution54ms
Transfer8 KB
Monthly Cost$1/mo
www.cisco.com
Other
Optional
Execution53ms
Transfer12 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.cisco.com adds 2203ms and costs ~$29/month
virtualconcierge.cisco.com adds 1329ms and costs ~$18/month
Unattributable adds 1176ms and costs ~$16/month
www.cisco.com adds 909ms and costs ~$12/month
www.cisco.com adds 575ms and costs ~$8/month
www.cisco.com adds 304ms and costs ~$4/month
s.go-mpulse.net adds 282ms and costs ~$4/month
tags.tiqcdn.com adds 247ms 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.cisco.com takes 2203ms 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
virtualconcierge.cisco.com takes 1329ms 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 virtualconcierge.cisco.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
Unattributable takes 1176ms 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.cisco.com takes 909ms 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 OneTrust'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.cisco.com takes 575ms 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 www.cisco.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
www.cisco.com takes 304ms 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 282ms 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
tags.tiqcdn.com takes 247ms 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.