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https://cervantes.es

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

2.46 s

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

3.43 s

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

121 ms

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

0.051

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

4.90 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.

5.16 s

Page Load Progression

752 ms
1.5 s
2.3 s
3.0 s
3.8 s
4.5 s
5.3 s
6.0 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 74 requests
FIX
3.1 MB transferred, 74 requests
Warning::
Page weighs 6.2 MB (3.1 MB transferred)
Info::
Fonts are 1.6 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.6 MB
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::
74 HTTP requests
Info::
Estimated 0.64 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
74 requests
0.64 g CO2 per page load
Fonts 1.6 MiB 52%
JavaScript 1.0 MiB 34%
Images 272.8 KiB 9%
CSS 152.0 KiB 5%
HTML 27.9 KiB 1%
Other 3.2 KiB 0%
Other 1.5 KiB 0%
Other 80 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
20 scripts, 432 KB unused
FIX
20 scripts, 432 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-F4FC...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-57JP...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Z9V7...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VD16...: 63 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PS6...: 61 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 432 KB
432 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-F4FCEM5J85&cx=c&gtm=4e64k0158 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-57JPCLFY9Z&cx=c&gtm=4e64k0158 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-Z9V7YFW9ZK&cx=c&gtm=4e64k0145 KB64 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-VD16MRRKY3&cx=c&gtm=4e64k0150 KB63 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PS6K4LP129 KB61 KB (48%)✓3rd
https://cervantes.org/sites/public/produccion/files/js/js_lov-6XIpuvZUjoaqTvgQJM0SqWShUUsRON1FzDTuFms.js?scope=footer&delta=0&language=es&theme=ica_bootstrap_ic&include=eJxtkNtuwzAIhl_Iix8JYYdaZMRYhnTtnn5O2m6NtBsOH-LngIXqjBEPBytV21BC1k5x7ltDmbKKYDMacG0d48NNiw2gn0wGWeuFS1z2aCcgmg-RU_mchqTq5h1b_I2gdQKu7IEzwh_mHItoQvkwvwvXEopqEQLHEsswEy54e1Ns2vRK_Y24qji3106vZRbrU55rwNMXjFas44Ak-H2PifWhf2X6snjY50Bypw50a2o0w4VlpBaHCPW9_f8ybq5gW1rZfwBDo5Wt91 KB60 KB (66%)✓3rd
https://cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1/dist/cookiesjsr.min.js?v=1.0.13109 KB50 KB (46%)✓3rd
https://cdn.jsdelivr.net/npm/entreprise7pro-bootstrap@3.4.7/dist/js/bootstrap.min.js11 KB—✓3rd
https://cervantes.org/modules/custom/cookies_config/js/cookies_config.js?v=1.x1 KB—✓3rd
https://cervantes.org/sites/public/produccion/files/js/js_fQXajgLdcxakMdzDhRtmEI3_1V-JErx_5vLlCzpQfbQ.js?scope=footer&delta=5&language=es&theme=ica_bootstrap_ic&include=eJxtkNtuwzAIhl_Iix8JYYdaZMRYhnTtnn5O2m6NtBsOH-LngIXqjBEPBytV21BC1k5x7ltDmbKKYDMacG0d48NNiw2gn0wGWeuFS1z2aCcgmg-RU_mchqTq5h1b_I2gdQKu7IEzwh_mHItoQvkwvwvXEopqEQLHEsswEy54e1Ns2vRK_Y24qji3106vZRbrU55rwNMXjFas44Ak-H2PifWhf2X6snjY50Bypw50a2o0w4VlpBaHCPW9_f8ybq5gW1rZfwBDo5Wt31 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

F
Page Weight Inventory
Action
74 resources · 3.1 MB · 432 KB savings available
FIX
74 resources · 3.1 MB · 432 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~432 KB of savings available
Warning::
73 third-party resources (100% of weight)
Info::
4 resources over 200KB
74 resources · 3.1 MiB · 73 third-party 2.1 MiB over 1MB target
Font 52% · 1.6 MiB
JavaScript 34% · 1.0 MiB
Image 9% · 274.3 KiB
CSS 5% · 152.0 KiB
Document 1% · 27.9 KiB
Other 0% · 3.4 KiB

~431.9 KiB of savings available

Remove unused JavaScript: 431.9 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://cervantes.org/sites/public/produccion/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cervantes.org/themes/custom/cervantes_them... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cervantes.org/sites/public/produccion/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cervantes.org/sites/public/produccion/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 273 KB
0 oversized -0 KB
21 legacy format
4 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1118ms total JS execution
REVIEW
1118ms total JS execution
Warning::
https://cervantes.org/: 252ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-F4FC...: 138ms CPU time
Info::
Unattributable: 129ms CPU time
Info::
https://cervantes.org/sites/public/produccion/file...: 119ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-57JP...: 102ms CPU time
Warning::
Third-party scripts: 1118ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Style & Layout 22% Other 14% Script Parsing & Compilation 10% Rendering 4% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://cervantes.org/252ms4ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-F4FCEM5J85&cx=c&gtm=4e64k0138ms118ms18ms3rd
Unattributable129ms3ms0ms3rd
https://cervantes.org/sites/public/produccion/files/js/js_fQXajgLdcxakMdzDhRtmEI3_1V-JErx_5vLlCzpQfbQ.js?scope=footer&delta=5&language=es&theme=ica_bootstrap_ic&include=eJxtkNtuwzAIhl_Iix8JYYdaZMRYhnTtnn5O2m6NtBsOH-LngIXqjBEPBytV21BC1k5x7ltDmbKKYDMacG0d48NNiw2gn0wGWeuFS1z2aCcgmg-RU_mchqTq5h1b_I2gdQKu7IEzwh_mHItoQvkwvwvXEopqEQLHEsswEy54e1Ns2vRK_Y24qji3106vZRbrU55rwNMXjFas44Ak-H2PifWhf2X6snjY50Bypw50a2o0w4VlpBaHCPW9_f8ybq5gW1rZfwBDo5Wt119ms50ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=G-57JPCLFY9Z&cx=c&gtm=4e64k0102ms72ms22ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PS6K4LP99ms74ms22ms3rd
https://cervantes.org/sites/public/produccion/files/js/js_lov-6XIpuvZUjoaqTvgQJM0SqWShUUsRON1FzDTuFms.js?scope=footer&delta=0&language=es&theme=ica_bootstrap_ic&include=eJxtkNtuwzAIhl_Iix8JYYdaZMRYhnTtnn5O2m6NtBsOH-LngIXqjBEPBytV21BC1k5x7ltDmbKKYDMacG0d48NNiw2gn0wGWeuFS1z2aCcgmg-RU_mchqTq5h1b_I2gdQKu7IEzwh_mHItoQvkwvwvXEopqEQLHEsswEy54e1Ns2vRK_Y24qji3106vZRbrU55rwNMXjFas44Ak-H2PifWhf2X6snjY50Bypw50a2o0w4VlpBaHCPW9_f8ybq5gW1rZfwBDo5Wt89ms44ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-VD16MRRKY3&cx=c&gtm=4e64k073ms46ms18ms3rd
https://cdn.jsdelivr.net/gh/jfeltkamp/cookiesjsr@1/dist/cookiesjsr.min.js?v=1.0.1359ms51ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Z9V7YFW9ZK&cx=c&gtm=4e64k058ms44ms14ms3rd
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
11 fonts (1616 KB)
PASS
11 fonts (1616 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

1616 KB total

Render-blocking

0

of 11

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 4.0 s 5.0 s 6.0 s FCP 2.5 s LCP 3.4 shttps://cervantes.org/themes/custom/cervantes_theme/fonts/inter/Inter-SemiBold.ttfInter-SemiBold.ttf https://cervantes.org/themes/custom/cervantes_theme/fonts/inter/Inter-SemiBold.ttf — 310.3 KiB — 667 ms — font-display: swaphttps://cervantes.org/themes/custom/cervantes_theme/fonts/inter/Inter-Regular.ttfInter-Regular.ttf https://cervantes.org/themes/custom/cervantes_theme/fonts/inter/Inter-Regular.ttf — 304.5 KiB — 666 ms — font-display: swaphttps://cervantes.org/themes/custom/cervantes_theme/fonts/icomoon/fonts/icomoon.ttficomoon.ttf https://cervantes.org/themes/custom/cervantes_theme/fonts/icomoon/fonts/icomoon.ttf — 6.2 KiB — 172 ms — font-display: swaphttps://cervantes.org/themes/custom/cervantes_theme/fonts/dmsans/DMSans-SemiBold.ttfDMSans-SemiBold.ttf https://cervantes.org/themes/custom/cervantes_theme/fonts/dmsans/DMSans-SemiBold.ttf — 55.4 KiB — 386 ms — font-display: swaphttps://cervantes.org/themes/custom/cervantes_theme/fonts/dmsans/DMSans-Regular.ttfDMSans-Regular.ttf https://cervantes.org/themes/custom/cervantes_theme/fonts/dmsans/DMSans-Regular.ttf — 55.4 KiB — 350 ms — font-display: swaphttps://cervantes.org/themes/custom/cervantes_theme/fonts/fa/fa-brands-400.woff2fa-brands-400.woff2 https://cervantes.org/themes/custom/cervantes_theme/fonts/fa/fa-brands-400.woff2 — 116.8 KiB — 301 ms — font-display: swaphttps://cervantes.org/themes/custom/cervantes_theme/fonts/dmsans/DMSans-Bold.ttfDMSans-Bold.ttf https://cervantes.org/themes/custom/cervantes_theme/fonts/dmsans/DMSans-Bold.ttf — 55.4 KiB — 360 ms — font-display: swaphttps://cervantes.org/themes/custom/cervantes_theme/fonts/dmsans/DMSans-Medium.ttfDMSans-Medium.ttf https://cervantes.org/themes/custom/cervantes_theme/fonts/dmsans/DMSans-Medium.ttf — 55.5 KiB — 452 ms — font-display: swaphttps://cervantes.org/themes/custom/cervantes_theme/fonts/inter/Inter-Medium.ttfInter-Medium.ttf https://cervantes.org/themes/custom/cervantes_theme/fonts/inter/Inter-Medium.ttf — 309.3 KiB — 618 ms — font-display: swaphttps://cervantes.org/themes/custom/cervantes_theme/fonts/inter/Inter-Bold.ttfInter-Bold.ttf https://cervantes.org/themes/custom/cervantes_theme/fonts/inter/Inter-Bold.ttf — 310.7 KiB — 635 ms — font-display: swaphttps://fonts.gstatic.com/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2rP2Yp2ywxg089UriI5-g4vl... https://fonts.gstatic.com/s/dmsans/v17/rP2Yp2ywxg089UriI5-g4vlH9VoD8Cmcqbu0-K6z9mXg.woff2 — 36.1 KiB — 12 ms — font-display: swap
Inter-SemiBold.ttf ttf swap
Size 310 KB
Load time 667 ms
Start 5.0 s
Risk FOUT — text flashes from fallback to web font
  • 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
Inter-Regular.ttf ttf swap
Size 305 KB
Load time 666 ms
Start 5.0 s
Risk FOUT — text flashes from fallback to web font
  • 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
icomoon.ttf ttf swap
Size 6 KB
Load time 172 ms
Start 5.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
DMSans-SemiBold.ttf ttf swap
Size 55 KB
Load time 386 ms
Start 5.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
DMSans-Regular.ttf ttf swap
Size 55 KB
Load time 350 ms
Start 5.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-brands-400.woff2 woff2 swap
Size 117 KB
Load time 301 ms
Start 5.1 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
DMSans-Bold.ttf ttf swap
Size 55 KB
Load time 360 ms
Start 5.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
DMSans-Medium.ttf ttf swap
Size 55 KB
Load time 452 ms
Start 5.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Inter-Medium.ttf ttf swap
Size 309 KB
Load time 618 ms
Start 5.1 s
Risk FOUT — text flashes from fallback to web font
  • 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
Inter-Bold.ttf ttf swap
Size 311 KB
Load time 635 ms
Start 5.1 s
Risk FOUT — text flashes from fallback to web font
  • 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
rP2Yp2ywxg089UriI5-g4vl... woff2 swap
Size 36 KB
Load time 12 ms
Start 5.5 s
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 ~1115 KB and ~2230 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
74 requests over 7310ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 2.5 s LCP 3.4 shttps://cervantes.es// https://cervantes.es/ — 301 — 37 B — 1.6 s — h2http://www.cervantes.es/www.cervantes.es/ http://www.cervantes.es/ — 307 — 0 B — 4 ms — http/1.1https://www.cervantes.es/www.cervantes.es/ https://www.cervantes.es/ — 301 — 27 B — 167 ms — h2https://cervantes.org/cervantes.org/ https://cervantes.org/ — 200 — 27.9 KiB — 2.8 s — h2https://cervantes.org/sites/public/produccion/files/css/css_uOZczNbDM5c3SU7qCjMqJdPsiMXQjoThII2Nicbq8ro.css?delta=0&language=es&theme=ica_bootstrap_ic&include=eJxNTlsOwyAMuxCDI6EAGU2XNiiBrd3p1720_diyZVvOohiKjgbsCwFLdbZbxyUkMHSUISaRbl2hRcqhsiTgk_Wdaa0u_9Vhhs1dCW8WXugXKYPxyMiF0MKHZ1P_rKO5Bgr1GJ7su_Fz_FjbSEw2YXGJ4b6_HyXsHTXi1sSwxDPxIS1UXFGBH7WEUQscervantes.org/sites/public/producci... 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 1118ms · 999KB · €12/mo
cervantes.org
Other
Costly
Execution 252ms
Transfer 28 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 138ms
Transfer 158 KB
Unused 43%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 129ms
Transfer 0 KB
Monthly Cost €1/mo
cervantes.org
Other
Optional
Execution 119ms
Transfer 31 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 158 KB
Unused 42%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 99ms
Transfer 129 KB
Unused 48%
Monthly Cost €1/mo
cervantes.org
Other
Optional
Execution 89ms
Transfer 91 KB
Unused 66%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 150 KB
Unused 42%
Monthly Cost €1/mo
jsDelivr
CDN
Optional
Execution 59ms
Transfer 109 KB
Unused 46%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 145 KB
Unused 44%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • cervantes.org adds 252ms and costs ~€3/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

cervantes.org takes 252ms 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

66% of cervantes.org'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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