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.
778 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.34 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
178 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.01 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.
3.41 s
Page Load Progression
DPage Weight BudgetAction2.4 MB transferred, 83 requestsFIX
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
FJS BundlesAction30 scripts, 859 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdns.eu1.gigya.com/js/gigya.js?apikey=3_Hob3SXLWsBRwjPFz4f4ZEuxPo2PyeElFMWgWO2EXdBYUqwMk8lxNj78Fi_2VW5cH&lang=es | 238 KB | 141 KB (59%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946 | 187 KB | 139 KB (74%) | ✓ | 3rd |
| https://dkumiip2e9ary.cloudfront.net/js/prometeo-media/pro/segment.js | 184 KB | 101 KB (55%) | ✓ | 3rd |
| https://hb.20m.es/prebid/9.43.0-20m-v4.js | 120 KB | 96 KB (80%) | ✓ | 3rd |
| https://apis.google.com/_/scs/abc-static/_/js/k=gapi.lb.en.PJsh2cctCQI.O/m=client/rt=j/sv=1/d=1/ed=1/rs=AHpOoo_QlMhY2cycn60Rs8eI1WInRwuahw/cb=gapi.loaded_0?le=scs | 108 KB | 80 KB (74%) | ✓ | 3rd |
| https://dkumiip2e9ary.cloudfront.net/js/prometeo-media/pro/trigger.js | 76 KB | 49 KB (65%) | ✓ | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 103 KB | 48 KB (47%) | ✓ | 3rd |
| https://dkumiip2e9ary.cloudfront.net/js/prometeo-media/pro/identification.js | 78 KB | 43 KB (56%) | ✓ | 3rd |
| https://dkumiip2e9ary.cloudfront.net/js/prometeo-media/pro/prometeov2.js | 101 KB | 41 KB (44%) | ✓ | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 91 KB | 38 KB (64%) | ✓ | 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 InventoryAction83 resources · 2.4 MB · 859 KB savings availableFIX
~858.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 83 resources | 2.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction33 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
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
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 CostAction1436ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 339ms | 88ms | 0ms | 3rd |
| https://www.20minutos.es/ | 312ms | 31ms | 3ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946 | 131ms | 65ms | 18ms | 3rd |
| https://dkumiip2e9ary.cloudfront.net/js/prometeo-media/pro/prometeov2.js | 122ms | 90ms | 27ms | 3rd |
| https://dkumiip2e9ary.cloudfront.net/js/prometeo-media/pro/segment.js | 93ms | 70ms | 23ms | 3rd |
| https://cdns.eu1.gigya.com/js/gigya.js?apikey=3_Hob3SXLWsBRwjPFz4f4ZEuxPo2PyeElFMWgWO2EXdBYUqwMk8lxNj78Fi_2VW5cH&lang=es | 86ms | 63ms | 19ms | 3rd |
| https://sdk.mrf.io/statics/marfeel-sdk.js?id=2278 | 86ms | 79ms | 0ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 77ms | 63ms | 13ms | 3rd |
| https://experiences.mrf.io/statics/inline-experiences/esnext/standalone.js | 71ms | 47ms | 1ms | 3rd |
| https://hb.20m.es/prebid/9.43.0-20m-v4.js | 60ms | 48ms | 11ms | 3rd |
Showing top 10 of 11 scripts
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 Loading2 fonts (85 KB)PASS
Web fonts
2
85 KB total
Render-blocking
0
of 2
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 Waterfall83 requests over 2230msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 339ms | 0 KB | — | €4/mo | Costly |
www.20minutos.es www.20minutos.es | Other | 312ms | 92 KB | — | €3/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 131ms | 187 KB | 74% | €1/mo | Optional |
dkumiip2e9ary.cloudfront.net dkumiip2e9ary.cloudfront.net | Other | 122ms | 101 KB | 44% | €1/mo | Optional |
dkumiip2e9ary.cloudfront.net dkumiip2e9ary.cloudfront.net | Other | 93ms | 184 KB | 55% | €1/mo | Optional |
cdns.eu1.gigya.com cdns.eu1.gigya.com | Other | 86ms | 238 KB | 59% | €1/mo | Optional |
sdk.mrf.io sdk.mrf.io | Other | 86ms | 63 KB | 37% | €1/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 77ms | 103 KB | 47% | €1/mo | Optional |
experiences.mrf.io experiences.mrf.io | Other | 71ms | 28 KB | — | €1/mo | Optional |
hb.20m.es hb.20m.es | Other | 60ms | 120 KB | 80% | €1/mo | Optional |
bd0d60c1-6781-4938-a4fb-cfcf9f6d255d.edge.permutive.app bd0d60c1-6781-4938-a4fb-cfcf9f6d255d.edge.permutive.app | Other | 58ms | 118 KB | 32% | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 339ms and costs ~€4/month
- www.20minutos.es adds 312ms and costs ~€3/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
Unattributable takes 339ms 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
www.20minutos.es takes 312ms 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
74% 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
55% of dkumiip2e9ary.cloudfront.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
59% of cdns.eu1.gigya.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
80% of hb.20m.es'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