Performance
· 22 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.
642 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.57 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
221 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.005
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.63 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.
2.45 s
Page Load Progression
DPage Weight BudgetAction2.3 MB transferred, 99 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
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
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
DThird-Party ImpactAction98% third-party, 0 ms blockingFIX
DPage Weight InventoryAction99 resources · 2.3 MB · 141 KB savings availableFIX
~140.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 99 resources | 2.3 MiB | ||||||
BImage Optimization22 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
CJS Execution CostAction1527ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://iol-website.italiaonline.it/script/modules/iol-analytics.min.js | 447ms | 443ms | 2ms | 3rd |
| https://artigianmobiliremanzacco.cfd/ | 434ms | 9ms | 4ms | 1st |
| https://static.cdn-website.com/libs/bower-skrollr/skrollr.min.js | 159ms | 51ms | 1ms | 3rd |
| Unattributable | 142ms | 6ms | 0ms | 1st |
| https://consent.cookiebot.com/uc.js | 127ms | 101ms | 12ms | 3rd |
| https://static.cdn-website.com/mnlt/production/6669/_dm/s/rt/dist/scripts/d-js-one-runtime-unified-desktop.min.js | 115ms | 50ms | 14ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-23LNSPS7Q6 | 103ms | 81ms | 21ms | 3rd |
BJS Bundles45 scripts, 141 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-23LNSPS7Q6 | 181 KB | 73 KB (41%) | ✓ | 3rd |
| https://static.cdn-website.com/mnlt/production/6669/_dm/s/rt/dist/scripts/d-js-one-runtime-unified-desktop.min.js | 93 KB | 67 KB (72%) | ✓ | 3rd |
| https://iol-website.italiaonline.it/script/modules/services.min.js | 2 KB | — | ✓ | 3rd |
| https://static.cdn-website.com/mnlt/production/6669/editor/apps/modules/runtime/336.61bf05cc0de512d63d36.js | 3 KB | — | ✓ | 3rd |
| https://static.cdn-website.com/libs/jquery/jquery-3.7.0.min.js | 31 KB | — | ✓ | 3rd |
| https://static.cdn-website.com/mnlt/production/6669/_dm/s/rt/dist/scripts/d-js-jquery-migrate.min.js | 6 KB | — | ✓ | 3rd |
| https://d2e3ebjq9bfloz.cloudfront.net/Partners/IOL/scripts/jquery.iol.custom.min.js | 0 KB | — | ✓ | 3rd |
| https://iol-website.italiaonline.it/script/iol-body-np.js | 1 KB | — | ✓ | 3rd |
| https://iol-website.italiaonline.it/script/iol-body.js | 1 KB | — | ✓ | 3rd |
| https://consentcdn.cookiebot.com/consentconfig/a854b7ba-7720-4bde-a5a6-f8250877a176/artigianmobiliremanzacco.cfd/configuration.js | 0 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingno-cache, must-revalidateREVIEW
no-cache, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
| must-revalidate | — | Must recheck with server after expiry |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading9 fonts (271 KB)PASS
Web fonts
9
271 KB total
Render-blocking
0
of 9
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- 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 ~30 KB and ~60 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
A+Compression AlgorithmMain response uses brotliPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML uses no-cache -- safe revalidate-on-request policyPASS
A+Server-Timing Observability4 Server-Timing entries advertisedPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Network Waterfall99 requests over 5644msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
iol-website.italiaonline.it iol-website.italiaonline.it | Other | 447ms | 13 KB | — | €5/mo | Costly |
static.cdn-website.com static.cdn-website.com | Other | 159ms | 6 KB | — | €2/mo | Optional |
consent.cookiebot.com consent.cookiebot.com | Other | 127ms | 37 KB | — | €1/mo | Optional |
static.cdn-website.com static.cdn-website.com | Other | 115ms | 93 KB | 72% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 103ms | 181 KB | 41% | €1/mo | Optional |
These scripts may cost more than they're worth
- iol-website.italiaonline.it adds 447ms and costs ~€5/month
62% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
iol-website.italiaonline.it takes 447ms 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
72% of static.cdn-website.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 Optimization13 images, 0 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
13
Total Size
0 KB
Oversized
1