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https://www.elpais.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
5
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
65
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

973 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.12 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

286 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.005

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.33 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.

3.33 s

Page Load Progression

681 ms
1.4 s
2.0 s
2.7 s
3.4 s
4.1 s
4.8 s
5.4 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
5.7 MB transferred, 104 requests
FIX
5.7 MB transferred, 104 requests
Critical::
Page weighs 9.4 MB (5.7 MB transferred)
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
Fonts are 366 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 366 KB
Warning::
104 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.2 g CO2 per page load
5.7 MB / 2.4 MB budget
5.7 MB transferred
104 requests
1.2 g CO2 per page load
Other 3.7 MiB 65%
JavaScript 1.0 MiB 18%
Images 477.1 KiB 8%
Fonts 365.7 KiB 6%
HTML 123.6 KiB 2%
CSS 30.6 KiB 1%
Other 12.3 KiB 0%
Other 4.7 KiB 0%
Other 4.4 KiB 0%
Other 1.4 KiB 0%
Other 121 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

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.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (5.7 MiB of 5.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2287ms total JS execution
FIX
2287ms total JS execution
Warning::
https://elpais.com/: 677ms CPU time
Warning::
Unattributable: 561ms CPU time
Warning::
https://assets.adobedtm.com/0681c221600c/d0943e7fe...: 318ms CPU time
Info::
https://sdk.privacy-center.org/sdk/c8e2e67c354c0d6...: 202ms CPU time
Info::
https://js.datadome.co/tags.js: 173ms CPU time
Warning::
Third-party scripts: 2287ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 24% Style & Layout 14% Script Parsing & Compilation 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://elpais.com/677ms30ms4ms3rd
Unattributable561ms118ms0ms3rd
https://assets.adobedtm.com/0681c221600c/d0943e7fed9e/launch-90f4fb204f3b.min.js318ms270ms32ms3rd
https://sdk.privacy-center.org/sdk/c8e2e67c354c0d6dec2981e079061b37f6a1f337/modern/sdk.c8e2e67c354c0d6dec2981e079061b37f6a1f337.js202ms154ms22ms3rd
https://js.datadome.co/tags.js173ms153ms5ms3rd
https://static.elpais.com/dist/resources/js/ed7089ba2a40484f4aab104099c09b5b/ENP-section-front.js117ms70ms42ms3rd
https://fundingchoicesmessages.google.com/f/AGSKWxWl4OHVOhONFmrW5xi_scJ2jYwch61PP591wCtLQJVTlKBzlHvrAnxtgHVpItmxcNRmUnc2DlVHjXZ1d7PY115ms102ms12ms3rd
https://cmp.prisa.com/dist/cmp_ep.js71ms59ms1ms3rd
https://es-config.sensic.net/s2s-web.js53ms39ms8ms3rd
D
JS Bundles
Action
29 scripts, 408 KB unused
FIX
29 scripts, 408 KB unused
Warning::
https://static.elpais.com/dist/resources/js/ed7089...: 131 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 77 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/0681c221600c/d0943e7fe...: 46 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://fundingchoicesmessages.google.com/f/AGSKWx...: 36 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sdk.privacy-center.org/sdk/c8e2e67c354c0d6...: 34 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 408 KB
408 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.elpais.com/dist/resources/js/ed7089ba2a40484f4aab104099c09b5b/ENP-section-front.js193 KB131 KB (68%)✓3rd
https://accounts.google.com/gsi/client93 KB77 KB (83%)✓3rd
https://assets.adobedtm.com/0681c221600c/d0943e7fed9e/launch-90f4fb204f3b.min.js140 KB46 KB (33%)✓3rd
https://fundingchoicesmessages.google.com/f/AGSKWxWl4OHVOhONFmrW5xi_scJ2jYwch61PP591wCtLQJVTlKBzlHvrAnxtgHVpItmxcNRmUnc2DlVHjXZ1d7PY70 KB36 KB (53%)✓3rd
https://sdk.privacy-center.org/sdk/c8e2e67c354c0d6dec2981e079061b37f6a1f337/modern/sdk.c8e2e67c354c0d6dec2981e079061b37f6a1f337.js90 KB34 KB (38%)✓3rd
https://ak-ads-ns.prisasd.com/slot/elpais/slot.js53 KB33 KB (63%)✓3rd
https://sdk.mrf.io/statics/marfeel-sdk.js?id=222360 KB28 KB (47%)✓3rd
https://sdk.privacy-center.org/sdk/c8e2e67c354c0d6dec2981e079061b37f6a1f337/modern/ui-web-en-web.c8e2e67c354c0d6dec2981e079061b37f6a1f337.js52 KB22 KB (43%)✓3rd
https://assets.adobedtm.com/extensions/EPbf7b42aa08bc4f10879b1484195e80d1/AppMeasurement_Module_ActivityMap.min.js2 KB—✓3rd
blob:https://elpais.com/05b1a94d-7b63-4219-ae7e-48af26fe6c4a-0 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-cache, no-store, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
must-revalidate—Must recheck with server after expiry
B
Image Optimization
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Info::
All images are well-optimized
29 images 477 KB
0 oversized -0 KB
17 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
13 fonts (366 KB)
PASS
13 fonts (366 KB)
Info::
13 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

13

366 KB total

Render-blocking

0

of 13

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 973 ms LCP 3.1 shttps://elpais.com/especiales/2019/crecer-conectados/gurus-digitales/fonts/montserrat-extralight-webfont.woff2montserrat-extralight-w... https://elpais.com/especiales/2019/crecer-conectados/gurus-digitales/fonts/montserrat-extralight-webfont.woff2 — 18.3 KiB — 0 ms — font-display: swaphttps://elpais.com/especiales/2019/crecer-conectados/gurus-digitales/fonts/Majrit-Text-Roman.woffMajrit-Text-Roman.woff https://elpais.com/especiales/2019/crecer-conectados/gurus-digitales/fonts/Majrit-Text-Roman.woff — 35.4 KiB — 0 ms — font-display: swaphttps://elpais.com/especiales/2019/crecer-conectados/gurus-digitales/fonts/Majrit-Text-Italic.woffMajrit-Text-Italic.woff https://elpais.com/especiales/2019/crecer-conectados/gurus-digitales/fonts/Majrit-Text-Italic.woff — 38.3 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Bold.woff2Majrit-Text-Bold.woff2 https://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Bold.woff2 — 31.4 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Roman.woff2Majrit-Text-Roman.woff2 https://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Roman.woff2 — 27.5 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/marcin-ant-b/marcinantb-regular-webfont.woff2marcinantb-regular-webf... https://static.elpais.com/dist/resources/fonts/marcin-ant-b/marcinantb-regular-webfont.woff2 — 23.2 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/marcin-ant-b/marcinantb-bold-webfont.woff2marcinantb-bold-webfont... https://static.elpais.com/dist/resources/fonts/marcin-ant-b/marcinantb-bold-webfont.woff2 — 23.0 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Bold-Italic.woff2Majrit-Text-Bold-Italic... https://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Bold-Italic.woff2 — 27.2 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Black.woff2Majrit-Text-Black.woff2 https://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Black.woff2 — 28.4 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Medium.woff2Majrit-Text-Medium.woff2 https://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Medium.woff2 — 28.7 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/marcin-ant-b/marcinantb-medium-webfont.woff2marcinantb-medium-webfo... https://static.elpais.com/dist/resources/fonts/marcin-ant-b/marcinantb-medium-webfont.woff2 — 23.5 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Semibold-Italic.woff2Majrit-Text-Semibold-It... https://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Semibold-Italic.woff2 — 31.9 KiB — 0 ms — font-display: swaphttps://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Semibold.woff2Majrit-Text-Semibold.woff2 https://static.elpais.com/dist/resources/fonts/majrit/majrit-text/Majrit-Text-Semibold.woff2 — 28.9 KiB — 0 ms — font-display: swap
montserrat-extralight-w... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Majrit-Text-Roman.woff woff swap
Size 35 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Majrit-Text-Italic.woff woff swap
Size 38 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Majrit-Text-Bold.woff2 woff2 swap
Size 31 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Majrit-Text-Roman.woff2 woff2 swap
Size 27 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
marcinantb-regular-webf... woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
marcinantb-bold-webfont... woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Majrit-Text-Bold-Italic... woff2 swap
Size 27 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Majrit-Text-Black.woff2 woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Majrit-Text-Medium.woff2 woff2 swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
marcinantb-medium-webfo... woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Majrit-Text-Semibold-It... woff2 swap
Size 32 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Majrit-Text-Semibold.woff2 woff2 swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
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 ~22 KB and ~44 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
104 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 2287ms · 665KB · €12/mo
elpais.com
Other
Costly
Execution 677ms
Transfer 91 KB
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 561ms
Transfer 0 KB
Monthly Cost €3/mo
assets.adobedtm.com
Other
Costly
Execution 318ms
Transfer 140 KB
Unused 33%
Monthly Cost €2/mo
sdk.privacy-center.org
Other
Costly
Execution 202ms
Transfer 90 KB
Unused 38%
Monthly Cost €1/mo
js.datadome.co
Other
Optional
Execution 173ms
Transfer 43 KB
Monthly Cost €1/mo
static.elpais.com
Other
Optional
Execution 117ms
Transfer 193 KB
Unused 68%
Monthly Cost €1/mo
fundingchoicesmessages.google.com
Other
Optional
Execution 115ms
Transfer 70 KB
Unused 53%
Monthly Cost €1/mo
cmp.prisa.com
Other
Optional
Execution 71ms
Transfer 8 KB
Monthly Cost €0/mo
es-config.sensic.net
Other
Optional
Execution 53ms
Transfer 31 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • elpais.com adds 677ms and costs ~€4/month
  • Unattributable adds 561ms and costs ~€3/month
  • assets.adobedtm.com adds 318ms and costs ~€2/month
  • sdk.privacy-center.org adds 202ms and costs ~€1/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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

elpais.com takes 677ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 561ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

assets.adobedtm.com takes 318ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

sdk.privacy-center.org takes 202ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

68% of static.elpais.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

53% of fundingchoicesmessages.google.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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