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
57 images, 0 KB saveable
REVIEW
57 images, 0 KB saveable
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://static.quantcast.com/marketing-site/Quantc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA2QA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://static.quantcast.com/marketing-site/Quantc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://static.quantcast.com/marketing-site/icon-s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.builder.io/api/v1/image/assets%2F899c3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
57images1.2 MB
0oversized-0 KB
15legacy format
17missing 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
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 (143 KB)
PASS
2 fonts (143 KB)
Info::
i
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
143 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
HafferXH-SemiBold-v2.ttfttfswap
Size71 KB
Load time24 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
HafferXH-Regular-v2.ttfttfswap
Size71 KB
Load time24 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
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 ~43 KB and ~86 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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
✓
Page uses 5 resource hint(s)
Current Resource Hints
preconnect
4
preload—
dns-prefetch
1
prefetch—
5 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
109 requests over 3788ms
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-party6006ms · 761KB · €65/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.quantcast.com
www.quantcast.com
Other
1448ms
164 KB
—
€16/mo
Costly
Unattributable
Unattributable
Other
1353ms
0 KB
—
€15/mo
Costly
www.quantcast.com
www.quantcast.com
Other
1164ms
44 KB
—
€13/mo
Costly
info.quantcast.com
info.quantcast.com
Other
639ms
0 KB
49%
€7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
472ms
177 KB
41%
€5/mo
Costly
cmp.inmobi.com
cmp.inmobi.com
Other
342ms
117 KB
55%
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
335ms
145 KB
44%
€4/mo
Costly
www.quantcast.com
www.quantcast.com
Other
173ms
18 KB
—
€2/mo
Optional
www.quantcast.com
www.quantcast.com
Other
80ms
97 KB
59%
€1/mo
Optional
www.quantcast.com
Other
Costly
Execution1448ms
Transfer164 KB
Monthly Cost€16/mo
Unattributable
Other
Costly
Execution1353ms
Transfer0 KB
Monthly Cost€15/mo
www.quantcast.com
Other
Costly
Execution1164ms
Transfer44 KB
Monthly Cost€13/mo
info.quantcast.com
Other
Costly
Execution639ms
Transfer0 KB
Unused49%
Monthly Cost€7/mo
Google Tag Manager
Tag Manager
Costly
Execution472ms
Transfer177 KB
Unused41%
Monthly Cost€5/mo
cmp.inmobi.com
Other
Costly
Execution342ms
Transfer117 KB
Unused55%
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution335ms
Transfer145 KB
Unused44%
Monthly Cost€4/mo
www.quantcast.com
Other
Optional
Execution173ms
Transfer18 KB
Monthly Cost€2/mo
www.quantcast.com
Other
Optional
Execution80ms
Transfer97 KB
Unused59%
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.quantcast.com adds 1448ms and costs ~€16/month
Unattributable adds 1353ms and costs ~€15/month
www.quantcast.com adds 1164ms and costs ~€13/month
info.quantcast.com adds 639ms and costs ~€7/month
Google Tag Manager adds 472ms and costs ~€5/month
cmp.inmobi.com adds 342ms and costs ~€4/month
Google Tag Manager adds 335ms and costs ~€4/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.quantcast.com takes 1448ms 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 1353ms 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.quantcast.com takes 1164ms 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
info.quantcast.com takes 639ms 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 472ms 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
cmp.inmobi.com takes 342ms 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
55% of cmp.inmobi.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
Google Tag Manager takes 335ms 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 www.quantcast.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.