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
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Warning::
!
https://www.fiat.it/content/dam/fiat2023/master/Lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/professio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/professio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/fiat2023/cross/mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.fiat.it/content/dam/cps/fiat/it-it/Pro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
44images15.8 MB
0oversized-0 KB
42legacy format
32missing 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
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
12 fonts (785 KB)
PASS
12 fonts (785 KB)
Info::
i
12 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
12
785 KB total
Render-blocking
0
of 12
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
Poppins-Bold.ttfttfswap
Size65 KB
Load time29 ms
Start962 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
icons.woff2woff2swap
Size111 KB
Load time29 ms
Start962 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pxiByp8kv8JHgFVrLCz7Z1x...woff2swap
Size8 KB
Load time35 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
pxiEyp8kv8JHgFVrJJfecnF...woff2swap
Size8 KB
Load time37 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
PSAGroupeHMISans-Regula...woffswap
Size117 KB
Load time97 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
PSAGroupeHMISans-Regula...ttfswap
Size108 KB
Load time115 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time40 ms
Start2.0 s
RiskFOUT — text flashes from fallback to web font
fiat-2023.ttfttfswap
Size80 KB
Load time72 ms
Start2.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size0 KB
Load time0 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
PSAGroupeHMISans-Bold.woffwoffswap
Size116 KB
Load time41 ms
Start3.1 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Stellantis_Icons.ttfttfswap
Size131 KB
Load time70 ms
Start3.3 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pxiGyp8kv8JHgFVrJJLucHt...woff2swap
Size8 KB
Load time5 ms
Start5.5 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 ~476 KB and ~952 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.
Network Waterfall
184 requests over 7149ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
88%of JavaScript execution is third-party
First-party Third-party3084ms · 1050KB · €33/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.fiat.it
www.fiat.it
Other
661ms
56 KB
—
€7/mo
Costly
www.fiat.it
www.fiat.it
Other
369ms
50 KB
53%
€4/mo
Costly
webmessenger.ekonsilio.io
webmessenger.ekonsilio.io
Other
359ms
54 KB
—
€4/mo
Costly
www.fiat.it
www.fiat.it
Other
334ms
41 KB
—
€4/mo
Costly
www.fiat.it
www.fiat.it
Other
286ms
4 KB
—
€3/mo
Costly
www.fiat.it
www.fiat.it
Other
213ms
54 KB
—
€2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
152ms
138 KB
44%
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
137ms
131 KB
50%
€1/mo
Optional
st-eu.dynamicyield.com
st-eu.dynamicyield.com
Other
128ms
3 KB
—
€1/mo
Optional
cdn-eu.dynamicyield.com
cdn-eu.dynamicyield.com
Other
103ms
105 KB
64%
€1/mo
Optional
assets.adobedtm.com
assets.adobedtm.com
Other
101ms
70 KB
—
€1/mo
Optional
www.fiat.it
www.fiat.it
Other
67ms
24 KB
—
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
62ms
148 KB
45%
€1/mo
Optional
maps.googleapis.com
maps.googleapis.com
Other
57ms
100 KB
62%
€1/mo
Optional
webmessenger.ekonsilio.io
webmessenger.ekonsilio.io
Other
53ms
73 KB
46%
€1/mo
Optional
www.fiat.it
Other
Costly
Execution661ms
Transfer56 KB
Monthly Cost€7/mo
www.fiat.it
Other
Costly
Execution369ms
Transfer50 KB
Unused53%
Monthly Cost€4/mo
webmessenger.ekonsilio.io
Other
Costly
Execution359ms
Transfer54 KB
Monthly Cost€4/mo
www.fiat.it
Other
Costly
Execution334ms
Transfer41 KB
Monthly Cost€4/mo
www.fiat.it
Other
Costly
Execution286ms
Transfer4 KB
Monthly Cost€3/mo
www.fiat.it
Other
Costly
Execution213ms
Transfer54 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution152ms
Transfer138 KB
Unused44%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution137ms
Transfer131 KB
Unused50%
Monthly Cost€1/mo
st-eu.dynamicyield.com
Other
Optional
Execution128ms
Transfer3 KB
Monthly Cost€1/mo
cdn-eu.dynamicyield.com
Other
Optional
Execution103ms
Transfer105 KB
Unused64%
Monthly Cost€1/mo
assets.adobedtm.com
Other
Optional
Execution101ms
Transfer70 KB
Monthly Cost€1/mo
www.fiat.it
Other
Optional
Execution67ms
Transfer24 KB
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution62ms
Transfer148 KB
Unused45%
Monthly Cost€1/mo
maps.googleapis.com
Other
Optional
Execution57ms
Transfer100 KB
Unused62%
Monthly Cost€1/mo
webmessenger.ekonsilio.io
Other
Optional
Execution53ms
Transfer73 KB
Unused46%
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.fiat.it adds 661ms and costs ~€7/month
www.fiat.it adds 369ms and costs ~€4/month
webmessenger.ekonsilio.io adds 359ms and costs ~€4/month
www.fiat.it adds 334ms and costs ~€4/month
www.fiat.it adds 286ms and costs ~€3/month
www.fiat.it adds 213ms and costs ~€2/month
88% 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.fiat.it takes 661ms 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.fiat.it takes 369ms 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 www.fiat.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
webmessenger.ekonsilio.io takes 359ms 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.fiat.it takes 334ms 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.fiat.it takes 286ms 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.fiat.it 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.
Source: web.dev
64% of cdn-eu.dynamicyield.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
62% of maps.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.
767 ms
1.5 s
3.1 s
3.8 s
4.6 s
6.1 s