Performance
· 15 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.
2.25 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.45 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
10 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.009
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.22 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.
3.87 s
Page Load Progression
FPage Weight BudgetAction3.1 MB transferred, 67 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction67 resources · 3.1 MB · 280 KB savings availableFIX
~279.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 67 resources | 3.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization23 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
BJS Execution Cost761ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.esteri.it/it/ | 187ms | 5ms | 1ms | 3rd |
| https://www.esteri.it/wp-content/themes/mae/assets/js/bootstrap-italia.min.js?ver=2.1.1 | 155ms | 43ms | 8ms | 3rd |
| Unattributable | 151ms | 4ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TW25NWEC4Y | 146ms | 57ms | 13ms | 3rd |
| https://www.esteri.it/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js | 124ms | 100ms | 12ms | 3rd |
CJS BundlesAction17 scripts, 280 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.esteri.it/wp-content/plugins/iwy-extabman/public/js/chart_29.min.js?ver=2.9.2 | 81 KB | 63 KB (79%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TW25NWEC4Y | 146 KB | 63 KB (43%) | ✓ | 3rd |
| https://www.esteri.it/wp-content/themes/mae/assets/js/bootstrap-italia.min.js?ver=2.1.1 | 71 KB | 51 KB (73%) | ✓ | 3rd |
| https://www.esteri.it/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js | 165 KB | 40 KB (24%) | ✓ | 3rd |
| https://ingestion.webanalytics.italia.it/matomo.js | 66 KB | 38 KB (59%) | ✓ | 3rd |
| https://www.esteri.it/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 35 KB | 25 KB (71%) | ✓ | 3rd |
| https://www.esteri.it/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1 | 2 KB | — | ✓ | 3rd |
| https://chatbot.esteri.it/js/frame.js?bot=4&ver=6.9.4 | 2 KB | — | ✓ | 3rd |
| https://www.esteri.it/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375 | 2 KB | — | ✓ | 3rd |
| https://www.esteri.it/wp-content/plugins/iwy-newsletter/public/js/iwy-newsletter-public.min.js?ver=1.0.0 | 1 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
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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (135 KB)PASS
Web fonts
7
135 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall67 requests over 7371msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.esteri.it www.esteri.it | Other | 187ms | 24 KB | — | €2/mo | Optional |
www.esteri.it www.esteri.it | Other | 155ms | 71 KB | 73% | €2/mo | Optional |
Unattributable Unattributable | Other | 151ms | 0 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 146ms | 146 KB | 43% | €2/mo | Optional |
www.esteri.it www.esteri.it | Other | 124ms | 165 KB | 24% | €1/mo | Optional |
100% 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
73% of www.esteri.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