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.
9.38 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
21.09 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
4.14 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.004
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
10.99 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.
27.19 s
Page Load Progression
FPage Weight BudgetAction3.4 MB transferred, 98 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction11983ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1801ms | 438ms | 0ms | 3rd |
| https://www.eldiario.es/ | 1695ms | 294ms | 29ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WRDHMPW | 1395ms | 1135ms | 148ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/ui-web-en-web.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 730ms | 469ms | 38ms | 3rd |
| https://www.eldiario.es/app.h-5bd2772bdef2d90ace0e.js | 638ms | 485ms | 19ms | 3rd |
| https://marfeelexperimentsexperienceengine.mrf.io/experimentsexperience/render?id=AC_4Ph4IkFsQZ2_bECPMYqc-Q&experimentType=HeadlineAB&version=esnext | 625ms | 581ms | 0ms | 3rd |
| https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 534ms | 385ms | 93ms | 3rd |
| https://www.eldiario.es/edi-app.h-5bd2772bdef2d90ace0e.js | 419ms | 373ms | 39ms | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 406ms | 298ms | 64ms | 3rd |
| https://static.eldiario.es/statics/public/sibbo/prebid_eldiario_es_20260317.min.js | 406ms | 327ms | 76ms | 3rd |
Showing top 10 of 27 scripts
FJS BundlesAction42 scripts, 1.1 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.eldiario.es/vendor.h-5bd2772bdef2d90ace0e.js | 474 KB | 429 KB (91%) | ✓ | 3rd |
| https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 133 KB (71%) | ✓ | 3rd |
| https://static.eldiario.es/statics/public/sibbo/prebid_eldiario_es_20260317.min.js | 149 KB | 105 KB (71%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 68 KB (72%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-4RZPWREGF3&cx=c>m=4e64h1 | 174 KB | 68 KB (39%) | ✓ | 3rd |
| https://c.amazon-adsystem.com/aax2/apstag.js | 91 KB | 50 KB (55%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WRDHMPW | 181 KB | 49 KB (27%) | ✓ | 3rd |
| https://cdn.onesignal.com/sdks/OneSignalPageSDKES6.js?v=151607 | 69 KB | 48 KB (71%) | ✓ | 3rd |
| https://news.google.com/swg/js/v1/swg.js | 71 KB | 47 KB (68%) | ✓ | 3rd |
| https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js | 101 KB | 46 KB (45%) | ✓ | 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 InventoryAction98 resources · 3.4 MB · 1.1 MB savings availableFIX
~1.1 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 98 resources | 3.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization20 images, 0 KB saveableREVIEW
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 Loading11 fonts (642 KB)PASS
Web fonts
11
642 KB total
Render-blocking
0
of 11
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~128 KB and ~256 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints24 hints, 0 missing preconnectsPASS
Current Resource Hints
24 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall98 requests over 3461msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1801ms | 0 KB | — | €10/mo | Costly |
www.eldiario.es www.eldiario.es | Other | 1695ms | 95 KB | — | €9/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 1395ms | 181 KB | 27% | €7/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 730ms | 54 KB | — | €4/mo | Costly |
www.eldiario.es www.eldiario.es | Other | 638ms | 26 KB | — | €3/mo | Costly |
marfeelexperimentsexperienceengine.mrf.io marfeelexperimentsexperienceengine.mrf.io | Other | 625ms | 9 KB | — | €3/mo | Costly |
pagead2.googlesyndication.com pagead2.googlesyndication.com | Other | 534ms | 188 KB | 71% | €3/mo | Costly |
www.eldiario.es www.eldiario.es | Other | 419ms | 33 KB | 76% | €2/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 406ms | 101 KB | 45% | €2/mo | Costly |
static.eldiario.es static.eldiario.es | Other | 406ms | 149 KB | 71% | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 358ms | 174 KB | 39% | €2/mo | Costly |
www.eldiario.es www.eldiario.es | Other | 357ms | 474 KB | 91% | €2/mo | Costly |
c.amazon-adsystem.com c.amazon-adsystem.com | Other | 334ms | 91 KB | 55% | €2/mo | Costly |
sdk.mrf.io sdk.mrf.io | Other | 240ms | 59 KB | 45% | €1/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 217ms | 97 KB | 36% | €1/mo | Costly |
sdk.privacy-center.org sdk.privacy-center.org | Other | 195ms | 1 KB | — | €1/mo | Optional |
ats-wrapper.privacymanager.io ats-wrapper.privacymanager.io | Other | 193ms | 75 KB | 55% | €1/mo | Optional |
cdn.taboola.com cdn.taboola.com | Other | 192ms | 27 KB | — | €1/mo | Optional |
pagead2.googlesyndication.com pagead2.googlesyndication.com | Other | 186ms | 34 KB | — | €1/mo | Optional |
cdn.onesignal.com cdn.onesignal.com | Other | 185ms | 69 KB | 71% | €1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 169ms | 40 KB | — | €1/mo | Optional |
accounts.google.com accounts.google.com | Other | 165ms | 96 KB | 72% | €1/mo | Optional |
es-config.sensic.net es-config.sensic.net | Other | 149ms | 31 KB | — | €1/mo | Optional |
app.varify.io app.varify.io | Other | 134ms | 21 KB | — | €1/mo | Optional |
www.eldiario.es www.eldiario.es | Other | 106ms | 108 KB | — | €1/mo | Optional |
news.google.com news.google.com | Other | 79ms | 71 KB | 68% | €0/mo | Optional |
marfeelexperimentsexperienceengine.mrf.io marfeelexperimentsexperienceengine.mrf.io | Other | 77ms | 9 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1801ms and costs ~€10/month
- www.eldiario.es adds 1695ms and costs ~€9/month
- Google Tag Manager adds 1395ms and costs ~€7/month
- sdk.privacy-center.org adds 730ms and costs ~€4/month
- www.eldiario.es adds 638ms and costs ~€3/month
- marfeelexperimentsexperienceengine.mrf.io adds 625ms and costs ~€3/month
- pagead2.googlesyndication.com adds 534ms and costs ~€3/month
- www.eldiario.es adds 419ms and costs ~€2/month
- sdk.privacy-center.org adds 406ms and costs ~€2/month
- static.eldiario.es adds 406ms and costs ~€2/month
- Google Tag Manager adds 358ms and costs ~€2/month
- www.eldiario.es adds 357ms and costs ~€2/month
- c.amazon-adsystem.com adds 334ms and costs ~€2/month
- sdk.mrf.io adds 240ms and costs ~€1/month
- Facebook Pixel adds 217ms 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
Unattributable takes 1801ms 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.eldiario.es takes 1695ms 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 1395ms 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
sdk.privacy-center.org takes 730ms 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.eldiario.es takes 638ms 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 625ms 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
pagead2.googlesyndication.com takes 534ms 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
71% of pagead2.googlesyndication.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
www.eldiario.es takes 419ms 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
76% of www.eldiario.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
sdk.privacy-center.org takes 406ms 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
static.eldiario.es takes 406ms 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
71% of static.eldiario.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
Google Tag Manager takes 358ms 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.eldiario.es takes 357ms 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
91% of www.eldiario.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
c.amazon-adsystem.com takes 334ms 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
55% 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
sdk.mrf.io takes 240ms 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
Facebook Pixel takes 217ms 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
55% of ats-wrapper.privacymanager.io'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
71% of cdn.onesignal.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 accounts.google.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
68% of news.google.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