Performance
· 17 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.
6.25 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.54 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
3.32 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.045
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
44.18 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.
38.77 s
Page Load Progression
3.5 s 7.0 s 10.5 s 14.0 s 17.5 s 21.0 s 24.5 s
28.0 sFPage Weight BudgetAction4.8 MB transferred, 272 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
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
FJS Execution CostAction10965ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.elmundo.es/ | 1992ms | 1316ms | 36ms | 3rd |
| Unattributable | 1337ms | 389ms | 0ms | 3rd |
| https://cdn.tinypass.com/api/tinypass.min.js | 946ms | 642ms | 67ms | 3rd |
| https://marfeelexperimentsexperienceengine.mrf.io/experimentsexperience/render?id=AC_hVk00mgoTZKxzlNOEOnuUA&experimentType=HeadlineAB&version=esnext | 864ms | 721ms | 0ms | 3rd |
| https://tags.tiqcdn.com/utag/unidadeditorial/elmundo/prod/utag.js | 524ms | 309ms | 194ms | 3rd |
| https://script.crazyegg.com/pages/versioned/common-scripts/8bd952a5f71d37cdd1817ea41856b9fa.js | 402ms | 351ms | 27ms | 3rd |
| https://e00-elmundo.uecdn.es/assets/v26/js/mobile-272b193dbd6bc66bf992174747ba7d25e1057274.min.js | 351ms | 342ms | 7ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604100101/pubads_impl.js | 340ms | 252ms | 42ms | 3rd |
| https://sdk.privacy-center.org/sdk/d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3/modern/sdk.d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3.js | 312ms | 233ms | 31ms | 3rd |
| https://cdn.permutive.com/10453011-272d-49cd-9043-1964fdb36fd8-web.js | 286ms | 150ms | 120ms | 3rd |
Showing top 10 of 37 scripts
FJS BundlesAction126 scripts, 1.2 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604100101/pubads_impl.js | 186 KB | 126 KB (67%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-10944322645&cx=c>m=4e64e1 | 145 KB | 105 KB (72%) | ✓ | 3rd |
| https://imasdk.googleapis.com/js/sdkloader/ima3.js | 149 KB | 103 KB (69%) | ✓ | 3rd |
| https://e00-elmundo.uecdn.es/js/pbmu.js | 147 KB | 98 KB (67%) | ✓ | 3rd |
| https://cdn.tinypass.com/api/tinypass.min.js | 132 KB | 68 KB (52%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-12125487&cx=c>m=4e64e1 | 129 KB | 61 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-181957286-1 | 116 KB | 60 KB (52%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-96F1LB48N7&cx=c>m=4e64e1 | 147 KB | 59 KB (40%) | ✓ | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 91 KB | 58 KB (64%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-12992475&cx=c>m=4e64e1 | 129 KB | 56 KB (43%) | ✓ | 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 InventoryAction272 resources · 4.8 MB · 1.2 MB savings availableFIX
~1.2 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 272 resources | 4.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction39 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.
Performance issues directly impact user engagement and conversion rates.
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
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 Loading18 fonts (559 KB)PASS
Web fonts
18
559 KB total
Render-blocking
0
of 18
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 Hints3 hints, 0 missing preconnectsPASS
Current Resource Hints
3 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall272 requests over 30395msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.elmundo.es www.elmundo.es | Other | 1992ms | 96 KB | — | €11/mo | Costly |
Unattributable Unattributable | Other | 1337ms | 0 KB | — | €7/mo | Costly |
cdn.tinypass.com cdn.tinypass.com | Other | 946ms | 132 KB | 52% | €5/mo | Costly |
marfeelexperimentsexperienceengine.mrf.io marfeelexperimentsexperienceengine.mrf.io | Other | 864ms | 37 KB | — | €5/mo | Costly |
tags.tiqcdn.com tags.tiqcdn.com | Other | 524ms | 91 KB | 50% | €3/mo | Costly |
script.crazyegg.com script.crazyegg.com | Other | 402ms | 51 KB | 50% | €2/mo | Costly |
e00-elmundo.uecdn.es e00-elmundo.uecdn.es | Other | 351ms | 25 KB | — | €2/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 340ms | 186 KB | 67% | €2/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 312ms | 101 KB | 43% | €2/mo | Costly |
cdn.permutive.com cdn.permutive.com | Other | 286ms | 194 KB | 20% | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 264ms | 147 KB | 40% | €1/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 260ms | 129 KB | 47% | €1/mo | Costly |
cdn.cxense.com cdn.cxense.com | Other | 257ms | 38 KB | — | €1/mo | Costly |
e00-elmundo.uecdn.es e00-elmundo.uecdn.es | Other | 252ms | 147 KB | 67% | €1/mo | Costly |
adtcdn.unidadeditorial.es adtcdn.unidadeditorial.es | Other | 244ms | 150 KB | 37% | €1/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 228ms | 129 KB | 43% | €1/mo | Costly |
c.amazon-adsystem.com c.amazon-adsystem.com | Other | 187ms | 91 KB | 64% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 150ms | 116 KB | 52% | €1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 147ms | 78 KB | 64% | €1/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 130ms | 53 KB | — | €1/mo | Optional |
Hotjar script.hotjar.com | Session Replay | 129ms | 57 KB | 67% | €1/mo | Optional |
tags.tiqcdn.com tags.tiqcdn.com | Other | 124ms | 3 KB | — | €1/mo | Optional |
e00-elmundo.uecdn.es e00-elmundo.uecdn.es | Other | 123ms | 33 KB | — | €1/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 117ms | 21 KB | — | €1/mo | Optional |
code.jquery.com code.jquery.com | Other | 107ms | 30 KB | — | €1/mo | Optional |
aswpsdkeu.com aswpsdkeu.com | Other | 106ms | 41 KB | 75% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 100ms | 145 KB | 36% | €1/mo | Optional |
imasdk.googleapis.com imasdk.googleapis.com | Other | 97ms | 149 KB | 69% | €1/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 96ms | 1 KB | — | €1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 73ms | 35 KB | — | €0/mo | Optional |
sdk.mrf.io sdk.mrf.io | Other | 67ms | 58 KB | 39% | €0/mo | Optional |
content.zeotap.com content.zeotap.com | Other | 66ms | 19 KB | — | €0/mo | Optional |
sb.scorecardresearch.com sb.scorecardresearch.com | Other | 61ms | 0 KB | — | €0/mo | Optional |
api-esp.piano.io api-esp.piano.io | Other | 60ms | 29 KB | — | €0/mo | Optional |
e00-elmundo.uecdn.es e00-elmundo.uecdn.es | Other | 58ms | 24 KB | — | €0/mo | Optional |
e01-elmundo.uecdn.es e01-elmundo.uecdn.es | Other | 58ms | 7 KB | — | €0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 51ms | 145 KB | 72% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.elmundo.es adds 1992ms and costs ~€11/month
- Unattributable adds 1337ms and costs ~€7/month
- cdn.tinypass.com adds 946ms and costs ~€5/month
- marfeelexperimentsexperienceengine.mrf.io adds 864ms and costs ~€5/month
- tags.tiqcdn.com adds 524ms and costs ~€3/month
- script.crazyegg.com adds 402ms and costs ~€2/month
- e00-elmundo.uecdn.es adds 351ms and costs ~€2/month
- securepubads.g.doubleclick.net adds 340ms and costs ~€2/month
- sdk.privacy-center.org adds 312ms and costs ~€2/month
- cdn.permutive.com adds 286ms and costs ~€2/month
- Google Tag Manager adds 264ms and costs ~€1/month
- Google Tag Manager adds 260ms and costs ~€1/month
- cdn.cxense.com adds 257ms and costs ~€1/month
- e00-elmundo.uecdn.es adds 252ms and costs ~€1/month
- adtcdn.unidadeditorial.es adds 244ms and costs ~€1/month
- Google Tag Manager adds 228ms and costs ~€1/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
www.elmundo.es takes 1992ms 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 1337ms 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
cdn.tinypass.com takes 946ms 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
52% of cdn.tinypass.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
marfeelexperimentsexperienceengine.mrf.io takes 864ms 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
tags.tiqcdn.com takes 524ms 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
script.crazyegg.com takes 402ms 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
e00-elmundo.uecdn.es takes 351ms 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
securepubads.g.doubleclick.net takes 340ms 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 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
sdk.privacy-center.org 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
cdn.permutive.com takes 286ms 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
Google Tag Manager takes 264ms 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
Google Tag Manager takes 260ms 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
cdn.cxense.com takes 257ms 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
e00-elmundo.uecdn.es takes 252ms 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 e00-elmundo.uecdn.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
adtcdn.unidadeditorial.es takes 244ms 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
Google Tag Manager takes 228ms 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
64% of c.amazon-adsystem.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
52% of Google Tag Manager'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
64% of Facebook Pixel'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
67% of Hotjar'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
75% of aswpsdkeu.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
69% of imasdk.googleapis.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
72% of Google Tag Manager'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