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https://www.elpais.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
34
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

3.66 s

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

14.74 s

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

2.23 s

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

0.000

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

6.08 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.

16.50 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
5.8 MB transferred, 108 requests
FIX
5.8 MB transferred, 108 requests
Critical::
Page weighs 9.5 MB (5.8 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 274 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 274 KB
Warning::
108 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
5.8 MB / 2.4 MB budget
5.8 MB transferred
108 requests
1.2 g CO2 per page load
Other 3.7 MiB 64%
JavaScript 1.0 MiB 18%
Images 613.7 KiB 10%
Fonts 273.8 KiB 5%
HTML 123.1 KiB 2%
CSS 30.6 KiB 1%
Other 12.3 KiB 0%
Other 4.6 KiB 0%
Other 4.2 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 (5.8 MiB of 5.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9372ms total JS execution
FIX
9372ms total JS execution
Warning::
https://elpais.com/: 2152ms CPU time
Warning::
Unattributable: 2139ms CPU time
Warning::
https://assets.adobedtm.com/0681c221600c/d0943e7fe...: 1227ms CPU time
Warning::
https://static.elpais.com/dist/resources/js/ed7089...: 673ms CPU time
Warning::
https://js.datadome.co/tags.js: 633ms CPU time
Warning::
Third-party scripts: 9372ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 24% Style & Layout 15% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://elpais.com/2152ms144ms22ms3rd
Unattributable2139ms440ms0ms3rd
https://assets.adobedtm.com/0681c221600c/d0943e7fed9e/launch-90f4fb204f3b.min.js1227ms1029ms143ms3rd
https://static.elpais.com/dist/resources/js/ed7089ba2a40484f4aab104099c09b5b/ENP-section-front.js673ms274ms175ms3rd
https://js.datadome.co/tags.js633ms508ms18ms3rd
https://sdk.privacy-center.org/sdk/c8e2e67c354c0d6dec2981e079061b37f6a1f337/modern/sdk.c8e2e67c354c0d6dec2981e079061b37f6a1f337.js506ms423ms52ms3rd
https://fundingchoicesmessages.google.com/f/AGSKWxWl4OHVOhONFmrW5xi_scJ2jYwch61PP591wCtLQJVTlKBzlHvrAnxtgHVpItmxcNRmUnc2DlVHjXZ1d7PY326ms284ms36ms3rd
https://es-config.sensic.net/s2s-web.js248ms179ms53ms3rd
https://cmp.prisa.com/dist/cmp_ep.js221ms200ms5ms3rd
https://ak-ads-ns.prisasd.com/slot/elpais/slot.js219ms61ms24ms3rd

Showing top 10 of 20 scripts

D
JS Bundles
Action
32 scripts, 406 KB unused
FIX
32 scripts, 406 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...: 35 KB unused (51%)
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: 406 KB
406 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 KB35 KB (51%)✓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 KB34 KB (65%)✓3rd
https://sdk.mrf.io/statics/marfeel-sdk.js?id=222360 KB26 KB (44%)✓3rd
https://sdk.privacy-center.org/sdk/c8e2e67c354c0d6dec2981e079061b37f6a1f337/modern/ui-web-en-web.c8e2e67c354c0d6dec2981e079061b37f6a1f337.js52 KB22 KB (43%)✓3rd
https://smetrics.elpais.com/id?d_visid_ver=5.5.0&d_fieldgroup=MC&mcorgid=2387401053DB208C0A490D4C%40AdobeOrg&ts=17755928853941 KB—✓3rd
https://sdk.privacy-center.org/sdk/c8e2e67c354c0d6dec2981e079061b37f6a1f337/modern/src_sdk_core_modules_integrations_sdk-integrations_providers_salesforce-dmp_salesforce-dmp_js.c8e2e67c354c0d6dec2981e079061b37f6a1f337.js1 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
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 614 KB
0 oversized -0 KB
18 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
10 fonts (274 KB)
PASS
10 fonts (274 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

274 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 3.7 s LCP 14.7 shttps://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-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/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/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
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-bold-webfont... woff2 swap
Size 23 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
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 24 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)
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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
3
preload
4
dns-prefetch
—
prefetch
—

7 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
108 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 9372ms · 1059KB · €50/mo
elpais.com
Other
Costly
Execution 2152ms
Transfer 90 KB
Monthly Cost €11/mo
Unattributable
Other
Costly
Execution 2139ms
Transfer 0 KB
Monthly Cost €11/mo
assets.adobedtm.com
Other
Costly
Execution 1227ms
Transfer 140 KB
Unused 33%
Monthly Cost €6/mo
static.elpais.com
Other
Costly
Execution 673ms
Transfer 193 KB
Unused 68%
Monthly Cost €4/mo
js.datadome.co
Other
Costly
Execution 633ms
Transfer 43 KB
Monthly Cost €3/mo
sdk.privacy-center.org
Other
Costly
Execution 506ms
Transfer 90 KB
Unused 38%
Monthly Cost €3/mo
fundingchoicesmessages.google.com
Other
Costly
Execution 326ms
Transfer 70 KB
Unused 51%
Monthly Cost €2/mo
es-config.sensic.net
Other
Costly
Execution 248ms
Transfer 31 KB
Monthly Cost €1/mo
cmp.prisa.com
Other
Costly
Execution 221ms
Transfer 8 KB
Monthly Cost €1/mo
ak-ads-ns.prisasd.com
Other
Costly
Execution 219ms
Transfer 53 KB
Unused 65%
Monthly Cost €1/mo
sdk.mrf.io
Other
Optional
Execution 191ms
Transfer 60 KB
Unused 44%
Monthly Cost €1/mo
sdk.privacy-center.org
Other
Optional
Execution 179ms
Transfer 52 KB
Unused 43%
Monthly Cost €1/mo
static.prisa.com
Other
Optional
Execution 134ms
Transfer 36 KB
Monthly Cost €1/mo
static.prisa.com
Other
Optional
Execution 104ms
Transfer 19 KB
Monthly Cost €1/mo
fundingchoicesmessages.google.com
Other
Optional
Execution 88ms
Transfer 4 KB
Monthly Cost €0/mo
accounts.google.com
Other
Optional
Execution 77ms
Transfer 93 KB
Unused 83%
Monthly Cost €0/mo
elpais.com
Other
Optional
Execution 75ms
Transfer 37 KB
Monthly Cost €0/mo
sdk.privacy-center.org
Other
Optional
Execution 69ms
Transfer 1 KB
Monthly Cost €0/mo
assets.adobedtm.com
Other
Optional
Execution 59ms
Transfer 36 KB
Monthly Cost €0/mo
fundingchoicesmessages.google.com
Other
Optional
Execution 52ms
Transfer 1 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • elpais.com adds 2152ms and costs ~€11/month
  • Unattributable adds 2139ms and costs ~€11/month
  • assets.adobedtm.com adds 1227ms and costs ~€6/month
  • static.elpais.com adds 673ms and costs ~€4/month
  • js.datadome.co adds 633ms and costs ~€3/month
  • sdk.privacy-center.org adds 506ms and costs ~€3/month
  • fundingchoicesmessages.google.com adds 326ms and costs ~€2/month
  • es-config.sensic.net adds 248ms and costs ~€1/month
  • cmp.prisa.com adds 221ms and costs ~€1/month
  • ak-ads-ns.prisasd.com adds 219ms 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 2152ms 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 2139ms 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 1227ms 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

static.elpais.com takes 673ms 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

js.datadome.co takes 633ms 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 506ms 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

fundingchoicesmessages.google.com takes 326ms 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

51% 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

es-config.sensic.net takes 248ms 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

cmp.prisa.com takes 221ms 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

ak-ads-ns.prisasd.com takes 219ms 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

65% of ak-ads-ns.prisasd.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

83% of accounts.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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