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.
1.33 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.48 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
214 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.07 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.
4.22 s
Page Load Progression
FPage Weight BudgetAction24.5 MB transferred, 109 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
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
DJS BundlesAction24 scripts, 396 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 242 KB (67%) | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-site.lc-84de632b711ab58df069ef54631781b5-lc.min.js | 91 KB | 82 KB (90%) | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-card.lc-2fb9a0acf3b11a6d3de80bfc3ca893fd-lc.min.js | 42 KB | 27 KB (63%) | ✓ | 3rd |
| https://gencat.containers.piwik.pro/eb50131d-1482-4c39-a0fa-835d5e4dacd6.js | 149 KB | 24 KB (16%) | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js | 35 KB | 22 KB (63%) | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/clientlibs/granite/jquery/granite/csrf.lc-652a558c3774088b61b0530c184710d1-lc.min.js | 2 KB | — | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-videos.lc-008ea0b9af96adce2b9a77224164336d-lc.min.js | 3 KB | — | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/foundation/clientlibs/main.lc-690ba627a9a2eeef0733ede272cf726b-lc.min.js | 3 KB | — | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-header.lc-04f15c9e9d8cb243ec6923624668732a-lc.min.js | 1 KB | — | ✓ | 3rd |
| https://web.gencat.cat/etc.clientlibs/aem-gencat-framework/clientlibs/clientlib-component/clientlib-menu-horizontal.lc-841bc321eb303258bf4caf4f8bca5488-lc.min.js | 5 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
DPage Weight InventoryAction109 resources · 24.5 MB · 396 KB savings availableFIX
~396.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 109 resources | 24.5 MiB | ||||||
DHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction50 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
CJS Execution CostAction1305ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://gencat.containers.piwik.pro/eb50131d-1482-4c39-a0fa-835d5e4dacd6.js | 689ms | 457ms | 184ms | 3rd |
| Unattributable | 371ms | 4ms | 0ms | 3rd |
| https://web.gencat.cat/ca/ciutadania/inici | 171ms | 8ms | 1ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 73ms | 36ms | 37ms | 3rd |
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 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
- Convert to woff2 for ~30% smaller file size
- 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 ~184 KB and ~368 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall109 requests over 3581msINFO
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 | 689ms | 149 KB | 16% | €7/mo | Costly |
Unattributable Unattributable | Other | 371ms | 0 KB | — | €4/mo | Costly |
web.gencat.cat web.gencat.cat | Other | 171ms | 21 KB | — | €2/mo | Optional |
www.gstatic.com www.gstatic.com | Other | 73ms | 362 KB | 67% | €1/mo | Optional |
These scripts may cost more than they're worth
- gencat.containers.piwik.pro adds 689ms and costs ~€7/month
- Unattributable adds 371ms and costs ~€4/month
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
gencat.containers.piwik.pro takes 689ms 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
Unattributable takes 371ms 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
67% 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