Performance
· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
3.64 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
13.76 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
353 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.158
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
15.92 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
17.68 s
Page Load Progression
FPage Weight BudgetAction3.6 MB transferred, 110 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction10299ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.poste.it/ | 4284ms | 21ms | 1ms | 3rd |
| https://www.poste.it/assets-da/core/js/poste-it.js | 2122ms | 1575ms | 3ms | 3rd |
| Unattributable | 1744ms | 14ms | 0ms | 1st |
| https://www.poste.it/assets-da/vendor/jquery/jquery.min.js | 1129ms | 350ms | 11ms | 3rd |
| https://assets.adobedtm.com/launch-EN592261e36dc14b10a9936e854a4b30db.min.js | 530ms | 388ms | 113ms | 3rd |
| https://consent.trustarc.com/notice?domain=posteitaliane.com&c=teconsent&language=it&country=it&text=true>m=true&js=bb¬iceType=bb | 190ms | 149ms | 6ms | 3rd |
| https://assets.adobedtm.com/extensions/EPbf7b42aa08bc4f10879b1484195e80d1/AppMeasurement.min.js | 146ms | 133ms | 5ms | 3rd |
| https://www.poste.it/widgets/one-web-common/header-area-pubblica-completo.bundle.js | 92ms | 68ms | 15ms | 3rd |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-8861 | 63ms | 41ms | 15ms | 3rd |
DPage Weight InventoryAction110 resources · 3.6 MB · 68 KB savings availableFIX
~67.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 110 resources | 3.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction55 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
BJS Bundles29 scripts, 68 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.adobedtm.com/launch-EN592261e36dc14b10a9936e854a4b30db.min.js | 118 KB | 26 KB (22%) | ✓ | 3rd |
| https://www.poste.it/widgets/one-web-common/header-area-pubblica-completo.bundle.js | 28 KB | 21 KB (79%) | ✓ | 3rd |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-8861 | 31 KB | 21 KB (68%) | ✓ | 3rd |
| https://www.poste.it/assets-custom/oneweb-js/tgposte-position.js | 1 KB | — | ✓ | 3rd |
| https://www.poste.it/assets-da/vendor/jquery/jquery.min.js | 29 KB | — | ✓ | 3rd |
| https://www.poste.it/assets-da/vendor/accessible-slick/js/slick.min.js | 10 KB | — | ✓ | 3rd |
| https://www.poste.it/assets-custom/oneweb-js/menu-ventaglio.min.js | 2 KB | — | ✓ | 3rd |
| https://www.poste.it/assets-da/core/js/utilita.js | 8 KB | — | ✗ | 3rd |
| https://www.poste.it/assets-da/core/js/poste-it.js | 4 KB | — | ✓ | 3rd |
| https://www.poste.it/assets-da/core/js/start-script.js | 4 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
CCompression AlgorithmActionMain response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (1228 KB)PASS
Web fonts
5
1228 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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
- 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
- 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
- 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
- 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 ~981 KB and ~1962 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
Network Waterfall110 requests over 3097msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.poste.it www.poste.it | Other | 4284ms | 33 KB | — | €23/mo | Costly |
www.poste.it www.poste.it | Other | 2122ms | 4 KB | — | €11/mo | Costly |
www.poste.it www.poste.it | Other | 1129ms | 29 KB | — | €6/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 530ms | 118 KB | 22% | €3/mo | Costly |
consent.trustarc.com consent.trustarc.com | Other | 190ms | 13 KB | — | €1/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 146ms | 12 KB | — | €1/mo | Optional |
www.poste.it www.poste.it | Other | 92ms | 28 KB | 79% | €0/mo | Optional |
consent.trustarc.com consent.trustarc.com | Other | 63ms | 31 KB | 68% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.poste.it adds 4284ms and costs ~€23/month
- www.poste.it adds 2122ms and costs ~€11/month
- www.poste.it adds 1129ms and costs ~€6/month
- assets.adobedtm.com adds 530ms and costs ~€3/month
83% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.poste.it takes 4284ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.poste.it takes 2122ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.poste.it takes 1129ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
assets.adobedtm.com takes 530ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
79% of www.poste.it's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
68% of consent.trustarc.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Image Optimization34 images, 11 KB total, 4 KB wastedINFO
Image Optimization Audit
Total Images
34
Total Size
11 KB
Oversized
1
Wasted
4 KB