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://www.register.it/wp-content/uploads/wordpre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/2017/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/earth-d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/2017/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/wordpre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/wordpre... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/home_se... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/2017/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/simplyS... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/simplyS... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/home_se... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/positiv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/2017/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/tld-blo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/dART-Lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn-teamblue.services/register.it/img/head... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/sparks-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/AI_Logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/digital... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/WhoisBa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.register.it/wp-content/uploads/home_se... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
57images2.0 MB
0oversized-0 KB
54legacy format
21missing 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
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
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
6 fonts (133 KB)
PASS
6 fonts (133 KB)
Info::
i
6 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
6
133 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
fontawesome-webfont.woff2woff2swap
Size64 KB
Load time49 ms
Start833 ms
RiskFOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R...woff2swap
Size14 KB
Load time13 ms
Start836 ms
RiskFOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R...woff2swap
Size15 KB
Load time20 ms
Start837 ms
RiskFOUT — text flashes from fallback to web font
memSYaGs126MiZpBA-UvWbX...woff2swap
Size13 KB
Load time28 ms
Start837 ms
RiskFOUT — text flashes from fallback to web font
6xK3dSBYKcSV-LCoeQqfX1R...woff2swap
Size15 KB
Load time33 ms
Start837 ms
RiskFOUT — text flashes from fallback to web font
memSYaGs126MiZpBA-UvWbX...woff2swap
Size13 KB
Load time35 ms
Start838 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
21 hints, 0 missing preconnects
PASS
21 hints, 0 missing preconnects
Info::
✓
Page uses 21 resource hint(s)
Current Resource Hints
preconnect
+6
16
preload—
dns-prefetch
5
prefetch—
21 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: Register S.p.A.
Network Waterfall
114 requests over 2614ms
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-party6864ms · 1080KB · €36/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
1197ms
0 KB
—
€6/mo
Costly
code.jquery.com
code.jquery.com
Other
887ms
33 KB
—
€5/mo
Costly
eu.acsbapp.com
eu.acsbapp.com
Other
884ms
222 KB
53%
€5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
866ms
196 KB
40%
€5/mo
Costly
trk.register.it
trk.register.it
Other
857ms
94 KB
44%
€5/mo
Costly
www.register.it
www.register.it
Other
785ms
32 KB
—
€4/mo
Costly
Iubenda
cdn.iubenda.com
Consent
620ms
111 KB
64%
€3/mo
Essential
Google Tag Manager
www.googletagmanager.com
Tag Manager
332ms
173 KB
40%
€2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
242ms
143 KB
45%
€1/mo
Costly
srv.cmp-teamblue.services
srv.cmp-teamblue.services
Other
194ms
75 KB
—
€1/mo
Optional
Unattributable
Other
Costly
Execution1197ms
Transfer0 KB
Monthly Cost€6/mo
code.jquery.com
Other
Costly
Execution887ms
Transfer33 KB
Monthly Cost€5/mo
eu.acsbapp.com
Other
Costly
Execution884ms
Transfer222 KB
Unused53%
Monthly Cost€5/mo
Google Tag Manager
Tag Manager
Costly
Execution866ms
Transfer196 KB
Unused40%
Monthly Cost€5/mo
trk.register.it
Other
Costly
Execution857ms
Transfer94 KB
Unused44%
Monthly Cost€5/mo
www.register.it
Other
Costly
Execution785ms
Transfer32 KB
Monthly Cost€4/mo
Iubenda
Consent
Essential
Execution620ms
Transfer111 KB
Unused64%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution332ms
Transfer173 KB
Unused40%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Costly
Execution242ms
Transfer143 KB
Unused45%
Monthly Cost€1/mo
srv.cmp-teamblue.services
Other
Optional
Execution194ms
Transfer75 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
Unattributable adds 1197ms and costs ~€6/month
code.jquery.com adds 887ms and costs ~€5/month
eu.acsbapp.com adds 884ms and costs ~€5/month
Google Tag Manager adds 866ms and costs ~€5/month
trk.register.it adds 857ms and costs ~€5/month
www.register.it adds 785ms and costs ~€4/month
Google Tag Manager adds 332ms and costs ~€2/month
Google Tag Manager adds 242ms 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
Unattributable takes 1197ms 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
code.jquery.com takes 887ms 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
eu.acsbapp.com takes 884ms 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 eu.acsbapp.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 866ms 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
trk.register.it takes 857ms 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.register.it takes 785ms 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
64% of Iubenda'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 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
Google Tag Manager takes 242ms 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.