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.
744 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.27 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
12 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.
986 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
2.67 s
Page Load Progression
375 ms 750 ms
1.1 s
1.5 s
1.9 s 2.2 s 2.6 s 3.0 sDJS BundlesAction16 scripts, 414 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 188 KB | 143 KB (76%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QFCGYDTZLZ&cx=c>m=4e64k1 | 151 KB | 64 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1B3Q8QTNDB&cx=c>m=4e64k1 | 152 KB | 63 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-MJZ6HSFQQG&cx=c>m=4e64k1 | 157 KB | 61 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PTC4Z5 | 132 KB | 60 KB (46%) | ✓ | 3rd |
| https://s3.eu-central-1.amazonaws.com/sc-devel/Skins/SMCService.js | 24 KB | 23 KB (97%) | ✗ | 3rd |
| https://s3.eu-central-1.amazonaws.com/sc-devel/sc-tagmanager/publico.js | 4 KB | — | ✓ | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 102 KB | — | ✓ | 3rd |
| https://cdn.smartclip-services.com/v1/Storage-a482323/smartclip-services/HeaderBidding/js/SmartclipConfig.js | 6 KB | — | ✓ | 3rd |
| https://sdk.privacy-center.org/d892ed41-2bfc-4977-a05e-07be26865229/loader.js?target=www.publico.es | 35 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
FPage Weight InventoryAction58 resources · 2.1 MB · 414 KB savings availableFIX
~413.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 58 resources | 2.1 MiB | ||||||
CPage Weight BudgetAction2.1 MB transferred, 58 requestsREVIEW
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
BThird-Party Impact53% third-party, 0 ms blockingREVIEW
CImage OptimizationAction23 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
BJS Execution Cost810ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.publico.es/ | 407ms | 30ms | 3ms | 1st |
| Unattributable | 177ms | 66ms | 0ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 59ms | 45ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1B3Q8QTNDB&cx=c>m=4e64k1 | 57ms | 45ms | 12ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 55ms | 42ms | 12ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PTC4Z5 | 54ms | 45ms | 8ms | 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 Loading9 fonts (351 KB)PASS
Web fonts
9
351 KB total
Render-blocking
0
of 9
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
AHTTP Cachingmax-age=60 (1 minute)PASS
max-age=60, must-revalidate, stale-if-error=86400, stale-while-revalidate=6
| Directive | Value | Meaning |
|---|---|---|
| max-age | 60 | Cache for 1 minute |
| must-revalidate | — | Must recheck with server after expiry |
| stale-if-error | 86400 | |
| stale-while-revalidate | 6 | Serve stale for 6 seconds while fetching fresh |
Network Waterfall58 requests over 887msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 177ms | 0 KB | — | €2/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 59ms | 102 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 57ms | 152 KB | 41% | €1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 55ms | 188 KB | 76% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 54ms | 132 KB | 46% | €1/mo | Optional |
50% 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
76% of securepubads.g.doubleclick.net'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