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
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://s.calameoassets.com/pinwheel/9555-2e9f2c/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24images12.2 MB
0oversized-0 KB
22legacy format
18missing 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
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
5 fonts (89 KB)
PASS
5 fonts (89 KB)
Info::
i
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
89 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
woff2;base64,d09GMgABAA...woff2swap
Size24 KB
Load time88 ms
Start2.1 s
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA...woff2swap
Size23 KB
Load time96 ms
Start2.1 s
RiskFOUT — text flashes from fallback to web font
x-font-woff;charset=utf...woffswap
Size27 KB
Load time98 ms
Start2.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
woff2;base64,d09GMgABAA...woff2swap
Size15 KB
Load time62 ms
Start2.4 s
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA...woff2swap
Size0 KB
Load time0 ms
Start3.4 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 ~8 KB and ~16 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
67 requests over 4102ms
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-party5337ms · 1386KB · €58/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
893ms
0 KB
—
€10/mo
Costly
v.calameo.com
v.calameo.com
Other
802ms
0 KB
46%
€9/mo
Costly
s.calameoassets.com
s.calameoassets.com
Other
642ms
250 KB
70%
€7/mo
Costly
www.calameo.com
www.calameo.com
Other
610ms
5 KB
—
€7/mo
Costly
consent.cookiebot.com
consent.cookiebot.com
Other
486ms
187 KB
—
€5/mo
Costly
v.calameo.com
v.calameo.com
Other
433ms
1 KB
—
€5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
323ms
141 KB
39%
€4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
275ms
153 KB
46%
€3/mo
Costly
v.calameo.com
v.calameo.com
Other
266ms
134 KB
66%
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
221ms
178 KB
37%
€2/mo
Costly
consent.cookiebot.com
consent.cookiebot.com
Other
198ms
36 KB
—
€2/mo
Optional
consent.cookiebot.com
consent.cookiebot.com
Other
73ms
88 KB
65%
€1/mo
Optional
s.calameoassets.com
s.calameoassets.com
Other
61ms
180 KB
—
€1/mo
Optional
static.gimii.fr
static.gimii.fr
Other
52ms
33 KB
60%
€1/mo
Optional
Unattributable
Other
Costly
Execution893ms
Transfer0 KB
Monthly Cost€10/mo
v.calameo.com
Other
Costly
Execution802ms
Transfer0 KB
Unused46%
Monthly Cost€9/mo
s.calameoassets.com
Other
Costly
Execution642ms
Transfer250 KB
Unused70%
Monthly Cost€7/mo
www.calameo.com
Other
Costly
Execution610ms
Transfer5 KB
Monthly Cost€7/mo
consent.cookiebot.com
Other
Costly
Execution486ms
Transfer187 KB
Monthly Cost€5/mo
v.calameo.com
Other
Costly
Execution433ms
Transfer1 KB
Monthly Cost€5/mo
Google Tag Manager
Tag Manager
Costly
Execution323ms
Transfer141 KB
Unused39%
Monthly Cost€4/mo
Google Tag Manager
Tag Manager
Costly
Execution275ms
Transfer153 KB
Unused46%
Monthly Cost€3/mo
v.calameo.com
Other
Costly
Execution266ms
Transfer134 KB
Unused66%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution221ms
Transfer178 KB
Unused37%
Monthly Cost€2/mo
consent.cookiebot.com
Other
Optional
Execution198ms
Transfer36 KB
Monthly Cost€2/mo
consent.cookiebot.com
Other
Optional
Execution73ms
Transfer88 KB
Unused65%
Monthly Cost€1/mo
s.calameoassets.com
Other
Optional
Execution61ms
Transfer180 KB
Monthly Cost€1/mo
static.gimii.fr
Other
Optional
Execution52ms
Transfer33 KB
Unused60%
Monthly Cost€1/mo
These scripts may cost more than they're worth
Unattributable adds 893ms and costs ~€10/month
v.calameo.com adds 802ms and costs ~€9/month
s.calameoassets.com adds 642ms and costs ~€7/month
www.calameo.com adds 610ms and costs ~€7/month
consent.cookiebot.com adds 486ms and costs ~€5/month
v.calameo.com adds 433ms and costs ~€5/month
Google Tag Manager adds 323ms and costs ~€4/month
Google Tag Manager adds 275ms and costs ~€3/month
v.calameo.com adds 266ms and costs ~€3/month
Google Tag Manager adds 221ms and costs ~€2/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
Unattributable takes 893ms 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
v.calameo.com takes 802ms 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.calameoassets.com takes 642ms 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.calameoassets.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.calameo.com takes 610ms 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
consent.cookiebot.com takes 486ms 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
v.calameo.com takes 433ms 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 323ms 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 275ms 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
v.calameo.com 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
66% of v.calameo.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 221ms 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 consent.cookiebot.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
60% of static.gimii.fr'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.