Performance
· 27 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.
1.66 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
14.33 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
644 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.39 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.
17.26 s
Page Load Progression
FPage Weight BudgetAction20.6 MB transferred, 94 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
DJS Execution CostAction3248ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://gencat.containers.piwik.pro/eb50131d-1482-4c39-a0fa-835d5e4dacd6.js | 1596ms | 1012ms | 459ms | 3rd |
| Unattributable | 811ms | 6ms | 0ms | 1st |
| https://web.gencat.cat/ca/inici | 345ms | 20ms | 3ms | 1st |
| https://www.gstatic.com/recaptcha/releases/w_Yb7dGGXaKesJ7BMiqFJqBG/recaptcha__en.js | 130ms | 73ms | 56ms | 3rd |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-site.lc-60432f6de6117f8e7c41a50c8bad73cf-lc.min.js | 114ms | 73ms | 28ms | 1st |
| https://web.gencat.cat/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js | 100ms | 43ms | 7ms | 1st |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-card.lc-2fb9a0acf3b11a6d3de80bfc3ca893fd-lc.min.js | 87ms | 50ms | 11ms | 1st |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-news-viewer.lc-10bebe390eaf915053fc1a3f1a1dd1ac-lc.min.js | 67ms | 32ms | 5ms | 1st |
DJS BundlesAction26 scripts, 390 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.gstatic.com/recaptcha/releases/w_Yb7dGGXaKesJ7BMiqFJqBG/recaptcha__en.js | 333 KB | 234 KB (71%) | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-site.lc-60432f6de6117f8e7c41a50c8bad73cf-lc.min.js | 92 KB | 83 KB (90%) | ✓ | 1st |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-card.lc-2fb9a0acf3b11a6d3de80bfc3ca893fd-lc.min.js | 42 KB | 27 KB (63%) | ✓ | 1st |
| https://gencat.containers.piwik.pro/eb50131d-1482-4c39-a0fa-835d5e4dacd6.js | 150 KB | 24 KB (16%) | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js | 35 KB | 22 KB (63%) | ✓ | 1st |
| https://web.gencat.cat/etc.clientlibs/clientlibs/granite/jquery/granite/csrf.lc-652a558c3774088b61b0530c184710d1-lc.min.js | 2 KB | — | ✓ | 1st |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-banner.lc-e0547c1b8a2b0ef31e2d19d6e8b96839-lc.min.js | 1 KB | — | ✓ | 1st |
| https://web.gencat.cat/etc.clientlibs/foundation/clientlibs/main.lc-690ba627a9a2eeef0733ede272cf726b-lc.min.js | 3 KB | — | ✓ | 1st |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-header.lc-04f15c9e9d8cb243ec6923624668732a-lc.min.js | 2 KB | — | ✓ | 1st |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-menu-horizontal.lc-b716771a8f7494b322fa189a6538623d-lc.min.js | 6 KB | — | ✓ | 1st |
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
CImage OptimizationAction42 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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
CCompression AlgorithmActionMain response served uncompressedREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
CPage Weight InventoryAction94 resources · 20.6 MB · 390 KB savings availableREVIEW
~389.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 94 resources | 20.6 MiB | ||||||
BJavaScript Blocking1 JS blocking issue(s) detectedREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Third-Party Impact5% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (328 KB)PASS
Web fonts
4
328 KB total
Render-blocking
0
of 4
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
- 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 ~184 KB and ~368 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+Main HTML Cache-ControlMain HTML max-age=300 (≤ 5min) is appropriatePASS
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
AHTTP Cachingmax-age=300 (5 minutes)PASS
max-age=300
| Directive | Value | Meaning |
|---|---|---|
| max-age | 300 | Cache for 5 minutes |
Network Waterfall94 requests over 5899msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
gencat.containers.piwik.pro gencat.containers.piwik.pro | Other | 1596ms | 150 KB | 16% | €17/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 130ms | 333 KB | 71% | €1/mo | Optional |
These scripts may cost more than they're worth
- gencat.containers.piwik.pro adds 1596ms and costs ~€17/month
53% 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
gencat.containers.piwik.pro takes 1596ms 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
71% of www.gstatic.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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-07-12 — 2026-08-08)
LCP (p75)
1375 ms
90% good
INP (p75)
281 ms
62% good
CLS (p75)
0.050
84% good
FCP (p75)
786 ms
TTFB (p75)
329 ms
Image Optimization49 images, 22696 KB total, 19 KB wastedINFO
Image Optimization Audit
Total Images
49
Total Size
22696 KB
Oversized
1
Wasted
19 KB