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.
1.99 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.51 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
182 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.617
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.90 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.
9.26 s
Page Load Progression
616 ms
1.2 s
1.8 s
2.5 s
3.1 s 3.7 s
4.3 s
4.9 sFPage Weight BudgetAction5.0 MB transferred, 324 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
DJS Execution CostAction2854ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.elmundo.es/ | 987ms | 724ms | 9ms | 3rd |
| Unattributable | 336ms | 83ms | 0ms | 3rd |
| https://marfeelexperimentsexperienceengine.mrf.io/experimentsexperience/render?id=AC_hVk00mgoTZKxzlNOEOnuUA&experimentType=HeadlineAB&version=esnext | 298ms | 223ms | 0ms | 3rd |
| https://cdn.tinypass.com/api/tinypass.min.js | 296ms | 212ms | 19ms | 3rd |
| https://sdk.privacy-center.org/sdk/d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3/modern/ui-web-en-web.d4911c3d5b4b9a80b40e05167f53d1b1e8da81f3.js | 191ms | 164ms | 4ms | 3rd |
| https://tags.tiqcdn.com/utag/unidadeditorial/elmundo/prod/utag.js | 127ms | 65ms | 59ms | 3rd |
| https://script.crazyegg.com/pages/versioned/common-scripts/8bd952a5f71d37cdd1817ea41856b9fa.js | 104ms | 93ms | 6ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604100101/pubads_impl.js | 103ms | 61ms | 10ms | 3rd |
| https://es-config.sensic.net/s2s-web.js | 83ms | 66ms | 5ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-12992475&cx=c>m=4e64e1 | 77ms | 68ms | 8ms | 3rd |
Showing top 10 of 14 scripts
FJS BundlesAction144 scripts, 1.4 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.permutive.com/10453011-272d-49cd-9043-1964fdb36fd8-web.js | 194 KB | 180 KB (93%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604100101/pubads_impl.js | 186 KB | 124 KB (66%) | ✓ | 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=G-96F1LB48N7&cx=c>m=4e64e1 | 147 KB | 60 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-181957286-1 | 116 KB | 60 KB (52%) | ✓ | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 91 KB | 58 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 InventoryAction324 resources · 5.0 MB · 1.4 MB savings availableFIX
~1.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 324 resources | 5.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction47 images, 0 KB saveableREVIEW
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
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
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 HintsNo optimization neededPASS
Network Waterfall324 requests over 6778msINFO
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 | 987ms | 98 KB | — | €5/mo | Costly |
Unattributable Unattributable | Other | 336ms | 0 KB | — | €2/mo | Costly |
marfeelexperimentsexperienceengine.mrf.io marfeelexperimentsexperienceengine.mrf.io | Other | 298ms | 37 KB | — | €2/mo | Costly |
cdn.tinypass.com cdn.tinypass.com | Other | 296ms | 132 KB | 52% | €2/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 191ms | 53 KB | — | €1/mo | Optional |
tags.tiqcdn.com tags.tiqcdn.com | Other | 127ms | 91 KB | 46% | €1/mo | Optional |
script.crazyegg.com script.crazyegg.com | Other | 104ms | 51 KB | 50% | €1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 103ms | 186 KB | 66% | €1/mo | Optional |
es-config.sensic.net es-config.sensic.net | Other | 83ms | 31 KB | — | €0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 77ms | 129 KB | 43% | €0/mo | Optional |
sdk.privacy-center.org sdk.privacy-center.org | Other | 73ms | 101 KB | 43% | €0/mo | Optional |
e00-elmundo.uecdn.es e00-elmundo.uecdn.es | Other | 68ms | 24 KB | — | €0/mo | Optional |
e00-elmundo.uecdn.es e00-elmundo.uecdn.es | Other | 60ms | 147 KB | 67% | €0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 53ms | 129 KB | 47% | €0/mo | Optional |
These scripts may cost more than they're worth
- www.elmundo.es adds 987ms and costs ~€5/month
- Unattributable adds 336ms and costs ~€2/month
- marfeelexperimentsexperienceengine.mrf.io adds 298ms and costs ~€2/month
- cdn.tinypass.com adds 296ms and costs ~€2/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 987ms 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 336ms 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
marfeelexperimentsexperienceengine.mrf.io takes 298ms 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 296ms 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
66% 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
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