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
138 images, 0 KB saveable
REVIEW
138 images, 0 KB saveable
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2016/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2021/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2016/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2020/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2021/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2016/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2021/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2021/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2021/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2016/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2021/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/768x-/dl/img/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2016/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2021/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.raiplay.it/resizegd/-x28/dl/img/2021/1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
138images2.1 MB
0oversized-0 KB
22legacy format
15missing 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
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
i
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
i
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
i
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
i
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
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 (112 KB)
PASS
5 fonts (112 KB)
Info::
i
5 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
5
112 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
Montserrat-Regular.woff2woff2swap
Size19 KB
Load time59 ms
Start949 ms
RiskFOUT — text flashes from fallback to web font
Montserrat-SemiBold.woff2woff2swap
Size19 KB
Load time60 ms
Start949 ms
RiskFOUT — text flashes from fallback to web font
Montserrat-Bold.woff2woff2swap
Size19 KB
Load time61 ms
Start949 ms
RiskFOUT — text flashes from fallback to web font
Inter.woff2woff2swap
Size46 KB
Load time240 ms
Start2.9 s
RiskFOUT — text flashes from fallback to web font
font-woff;charset=utf-8...woffswap
Size10 KB
Load time337 ms
Start3.0 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 ~3 KB and ~6 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+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
✓
LCP image preload audit not available for this scan
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
i
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
!
Total JS execution time is 17.5 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
✓
No CSS performance depth issues detected
Network Waterfall
235 requests over 6512ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
87%of JavaScript execution is third-party
First-party Third-party15180ms · 2214KB · €165/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.raiplay.it
www.raiplay.it
Other
8553ms
214 KB
—
€93/mo
Costly
www.raiplay.it
www.raiplay.it
Other
1085ms
665 KB
84%
€12/mo
Costly
www.raiplay.it
www.raiplay.it
Other
1032ms
124 KB
49%
€11/mo
Costly
www.raiplay.it
www.raiplay.it
Other
686ms
82 KB
56%
€7/mo
Costly
cdns.gigya.com
cdns.gigya.com
Other
597ms
209 KB
56%
€6/mo
Costly
www.raiplay.it
www.raiplay.it
Other
537ms
30 KB
73%
€6/mo
Costly
www.raiplay.it
www.raiplay.it
Other
508ms
25 KB
—
€6/mo
Costly
www.raiplay.it
www.raiplay.it
Other
340ms
57 KB
59%
€4/mo
Costly
www.raiplay.it
www.raiplay.it
Other
263ms
270 KB
69%
€3/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
209ms
79 KB
64%
€2/mo
Costly
www.raiplay.it
www.raiplay.it
Other
205ms
22 KB
—
€2/mo
Costly
imasdk.googleapis.com
imasdk.googleapis.com
Other
161ms
152 KB
75%
€2/mo
Optional
www.raiplay.it
www.raiplay.it
Other
137ms
44 KB
—
€1/mo
Optional
www.raiplay.it
www.raiplay.it
Other
136ms
13 KB
—
€1/mo
Optional
www.raiplay.it
www.raiplay.it
Other
131ms
37 KB
—
€1/mo
Optional
www.raiplay.it
www.raiplay.it
Other
113ms
64 KB
70%
€1/mo
Optional
www.raiplay.it
www.raiplay.it
Other
109ms
1 KB
—
€1/mo
Optional
www.raiplay.it
www.raiplay.it
Other
104ms
5 KB
—
€1/mo
Optional
www.raiplay.it
www.raiplay.it
Other
98ms
64 KB
82%
€1/mo
Optional
www.raiplay.it
www.raiplay.it
Other
66ms
17 KB
—
€1/mo
Optional
www.raiplay.it
www.raiplay.it
Other
56ms
32 KB
77%
€1/mo
Optional
www.raiplay.it
www.raiplay.it
Other
53ms
10 KB
—
€1/mo
Optional
www.raiplay.it
Other
Costly
Execution8553ms
Transfer214 KB
Monthly Cost€93/mo
www.raiplay.it
Other
Costly
Execution1085ms
Transfer665 KB
Unused84%
Monthly Cost€12/mo
www.raiplay.it
Other
Costly
Execution1032ms
Transfer124 KB
Unused49%
Monthly Cost€11/mo
www.raiplay.it
Other
Costly
Execution686ms
Transfer82 KB
Unused56%
Monthly Cost€7/mo
cdns.gigya.com
Other
Costly
Execution597ms
Transfer209 KB
Unused56%
Monthly Cost€6/mo
www.raiplay.it
Other
Costly
Execution537ms
Transfer30 KB
Unused73%
Monthly Cost€6/mo
www.raiplay.it
Other
Costly
Execution508ms
Transfer25 KB
Monthly Cost€6/mo
www.raiplay.it
Other
Costly
Execution340ms
Transfer57 KB
Unused59%
Monthly Cost€4/mo
www.raiplay.it
Other
Costly
Execution263ms
Transfer270 KB
Unused69%
Monthly Cost€3/mo
Facebook Pixel
Advertising
Costly
Execution209ms
Transfer79 KB
Unused64%
Monthly Cost€2/mo
www.raiplay.it
Other
Costly
Execution205ms
Transfer22 KB
Monthly Cost€2/mo
imasdk.googleapis.com
Other
Optional
Execution161ms
Transfer152 KB
Unused75%
Monthly Cost€2/mo
www.raiplay.it
Other
Optional
Execution137ms
Transfer44 KB
Monthly Cost€1/mo
www.raiplay.it
Other
Optional
Execution136ms
Transfer13 KB
Monthly Cost€1/mo
www.raiplay.it
Other
Optional
Execution131ms
Transfer37 KB
Monthly Cost€1/mo
www.raiplay.it
Other
Optional
Execution113ms
Transfer64 KB
Unused70%
Monthly Cost€1/mo
www.raiplay.it
Other
Optional
Execution109ms
Transfer1 KB
Monthly Cost€1/mo
www.raiplay.it
Other
Optional
Execution104ms
Transfer5 KB
Monthly Cost€1/mo
www.raiplay.it
Other
Optional
Execution98ms
Transfer64 KB
Unused82%
Monthly Cost€1/mo
www.raiplay.it
Other
Optional
Execution66ms
Transfer17 KB
Monthly Cost€1/mo
www.raiplay.it
Other
Optional
Execution56ms
Transfer32 KB
Unused77%
Monthly Cost€1/mo
www.raiplay.it
Other
Optional
Execution53ms
Transfer10 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.raiplay.it adds 8553ms and costs ~€93/month
www.raiplay.it adds 1085ms and costs ~€12/month
www.raiplay.it adds 1032ms and costs ~€11/month
www.raiplay.it adds 686ms and costs ~€7/month
cdns.gigya.com adds 597ms and costs ~€6/month
www.raiplay.it adds 537ms and costs ~€6/month
www.raiplay.it adds 508ms and costs ~€6/month
www.raiplay.it adds 340ms and costs ~€4/month
www.raiplay.it adds 263ms and costs ~€3/month
Facebook Pixel adds 209ms and costs ~€2/month
www.raiplay.it adds 205ms and costs ~€2/month
87% 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.raiplay.it takes 8553ms 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.raiplay.it takes 1085ms 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
84% of www.raiplay.it'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.raiplay.it takes 1032ms 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.raiplay.it takes 686ms 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
56% of www.raiplay.it'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
cdns.gigya.com takes 597ms 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
56% of cdns.gigya.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.raiplay.it takes 537ms 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
73% of www.raiplay.it'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.raiplay.it takes 508ms 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.raiplay.it 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
59% of www.raiplay.it'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.raiplay.it takes 263ms 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
69% of www.raiplay.it'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
Facebook Pixel takes 209ms 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 Facebook Pixel'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.raiplay.it takes 205ms 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
75% of imasdk.googleapis.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
70% of www.raiplay.it'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
82% of www.raiplay.it'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
77% of www.raiplay.it'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.