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.
B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Warning::
!
https://www.ipsos.com/sites/ipsos/themes/custom/ip... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12images4.0 MB
0oversized-0 KB
10legacy format
1missing 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
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 (137 KB)
PASS
7 fonts (137 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
137 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
wlpvgxjLBV1hqnzfr-F8sEY...woff2swap
Size15 KB
Load time54 ms
Start738 ms
RiskFOUT — text flashes from fallback to web font
ipsos-icons.woff2woff2swap
Size5 KB
Load time32 ms
Start738 ms
RiskFOUT — text flashes from fallback to web font
wlpigxjLBV1hqnzfr-F8sEY...woff2swap
Size16 KB
Load time54 ms
Start738 ms
RiskFOUT — text flashes from fallback to web font
wlpigxjLBV1hqnzfr-F8sEY...woff2swap
Size15 KB
Load time38 ms
Start738 ms
RiskFOUT — text flashes from fallback to web font
wlpigxjLBV1hqnzfr-F8sEY...woff2swap
Size15 KB
Load time44 ms
Start739 ms
RiskFOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9...woff2swap
Size45 KB
Load time28 ms
Start820 ms
RiskFOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF...woff2swap
Size24 KB
Load time26 ms
Start860 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
2
preload—
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall
49 requests over 1954ms
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-party3873ms · 1437KB · $67/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.ipsos.com
www.ipsos.com
Other
811ms
12 KB
—
$14/mo
Costly
choices.consentframework.com
choices.consentframework.com
Other
573ms
166 KB
25%
$10/mo
Costly
Unattributable
Unattributable
Other
566ms
0 KB
—
$10/mo
Costly
www.ipsos.com
www.ipsos.com
Other
366ms
117 KB
65%
$6/mo
Costly
www.ipsos.com
www.ipsos.com
Other
340ms
0 KB
—
$6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
266ms
173 KB
41%
$5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
232ms
162 KB
41%
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
213ms
169 KB
41%
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
183ms
145 KB
45%
$3/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
168ms
144 KB
45%
$3/mo
Optional
Google Fonts
fonts.googleapis.com
Font
78ms
347 KB
—
$1/mo
Optional
cache.consentframework.com
cache.consentframework.com
Other
78ms
3 KB
—
$1/mo
Optional
www.ipsos.com
Other
Costly
Execution811ms
Transfer12 KB
Monthly Cost$14/mo
choices.consentframework.com
Other
Costly
Execution573ms
Transfer166 KB
Unused25%
Monthly Cost$10/mo
Unattributable
Other
Costly
Execution566ms
Transfer0 KB
Monthly Cost$10/mo
www.ipsos.com
Other
Costly
Execution366ms
Transfer117 KB
Unused65%
Monthly Cost$6/mo
www.ipsos.com
Other
Costly
Execution340ms
Transfer0 KB
Monthly Cost$6/mo
Google Tag Manager
Tag Manager
Costly
Execution266ms
Transfer173 KB
Unused41%
Monthly Cost$5/mo
Google Tag Manager
Tag Manager
Costly
Execution232ms
Transfer162 KB
Unused41%
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution213ms
Transfer169 KB
Unused41%
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Optional
Execution183ms
Transfer145 KB
Unused45%
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Optional
Execution168ms
Transfer144 KB
Unused45%
Monthly Cost$3/mo
Google Fonts
Font
Optional
Execution78ms
Transfer347 KB
Monthly Cost$1/mo
cache.consentframework.com
Other
Optional
Execution78ms
Transfer3 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.ipsos.com adds 811ms and costs ~$14/month
choices.consentframework.com adds 573ms and costs ~$10/month
Unattributable adds 566ms and costs ~$10/month
www.ipsos.com adds 366ms and costs ~$6/month
www.ipsos.com adds 340ms and costs ~$6/month
Google Tag Manager adds 266ms and costs ~$5/month
Google Tag Manager adds 232ms and costs ~$4/month
Google Tag Manager adds 213ms 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.ipsos.com takes 811ms 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
choices.consentframework.com takes 573ms 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 566ms 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.ipsos.com takes 366ms 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
65% of www.ipsos.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.ipsos.com takes 340ms 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 266ms 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 232ms 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 213ms 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.