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Performance

· 24 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
3
REVIEW
3
PASS
17
INFO
1

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

78
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.

3.77 s

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

3.77 s

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

0 ms

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.

5.31 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.

3.77 s

Page Load Progression

610 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.7 s
4.3 s
4.9 s
Checks
24
17 PASS 3 REVIEW 3 FIX
D
Third-Party Impact
Action
91% third-party, 0 ms blocking
FIX
91% third-party, 0 ms blocking
Warning::
Third-party code accounts for 91% of page weight (243.3 KiB of 267.5 KiB)
Info::
Third-party blocking time is low (0 ms)
91%
First-party Third-party
D
JS Execution Cost
Action
2722ms total JS execution
FIX
2722ms total JS execution
Warning::
https://fernandolaserna.com/prueba6/js/hero-canvas...: 2237ms CPU time
Warning::
https://fernandolaserna.com/prueba6/index.html: 292ms CPU time
Info::
Unattributable: 193ms CPU time

Main Thread Breakdown

Other 47% Style & Layout 25% Script Evaluation 21% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://fernandolaserna.com/prueba6/js/hero-canvas.js2237ms586ms0ms1st
https://fernandolaserna.com/prueba6/index.html292ms5ms1ms1st
Unattributable193ms8ms0ms1st
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.
Info::
Last-Modified header present

No Cache-Control header

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

B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
267 KB transferred, 35 requests
PASS
267 KB transferred, 35 requests
Info::
Page weighs 427 KB (267 KB transferred)
Info::
Fonts are 223 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 223 KB
Info::
35 HTTP requests
Info::
Estimated 0.05 g CO2 per page load
267 KB / 2.4 MB budget
267 KB transferred
35 requests
0.05 g CO2 per page load
Fonts 222.7 KiB 83%
CSS 31.5 KiB 12%
HTML 7.3 KiB 3%
JavaScript 5.0 KiB 2%
Other 1.0 KiB 0%
0 2.4 MB 4.9 MB
Under 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

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+
Image Optimization
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (223 KB)
PASS
3 fonts (223 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

223 KB total

Render-blocking

0

of 3

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 3.8 s LCP 3.8 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 9 ms — font-display: swaphttps://fonts.gstatic.com/s/spacegrotesk/v22/V8mDoQDjQSkFtoMM3T6r8E7mPbF4C_k3HqU.woff2V8mDoQDjQSkFtoMM3T6r8E7... https://fonts.gstatic.com/s/spacegrotesk/v22/V8mDoQDjQSkFtoMM3T6r8E7mPbF4C_k3HqU.woff2 — 21.8 KiB — 8 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/webfonts/fa-solid-900.woff2 — 153.6 KiB — 19 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 9 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
V8mDoQDjQSkFtoMM3T6r8E7... woff2 swap
Size 22 KB
Load time 8 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 154 KB
Load time 19 ms
Start 1.0 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
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 ~77 KB and ~154 ms

A+
JS Bundles
9 scripts, 0 KB unused
PASS
9 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://fernandolaserna.com/prueba6/js/main.js0 KB1st
https://fernandolaserna.com/prueba6/js/navbar.js0 KB1st
https://fernandolaserna.com/prueba6/js/hero-canvas.js1 KB1st
https://fernandolaserna.com/prueba6/js/reveal.js0 KB1st
https://fernandolaserna.com/prueba6/js/faq.js0 KB1st
https://fernandolaserna.com/prueba6/js/modal.js0 KB1st
https://fernandolaserna.com/prueba6/js/form.js0 KB1st
https://fernandolaserna.com/prueba6/js/smooth-scroll.js0 KB1st
https://fernandolaserna.com/prueba6/js/cookie-consent.js2 KB1st
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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
dns-prefetch
prefetch

2 resource hints configured

A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Compression Algorithm
Main response uses brotli
PASS
Main response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
`Last-Modified` present -- timestamp-based conditional GET supported
Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.
A
Page Weight Inventory
35 resources · 267 KB · 0 KB savings available
PASS
35 resources · 267 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 267 KB
Warning::
5 third-party resources (91% of weight)
35 resources · 267.5 KiB · 5 third-party Within 1MB page-weight target
Font 83% · 222.7 KiB
CSS 12% · 31.5 KiB
Document 3% · 8.3 KiB
JavaScript 2% · 5.0 KiB
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
A+
JavaScript Blocking
No render-blocking JS or document.write usage detected
PASS
No render-blocking JS or document.write usage detected
Info::
No JavaScript blocking issues detected
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
Network Waterfall
35 requests over 1186ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 3.8 s LCP 3.8 shttps://fernandolaserna.com/prueba6/index.html/prueba6/index.html https://fernandolaserna.com/prueba6/index.html — 200 — 7.3 KiB — 358 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap — 200 — 1.5 KiB — 47 ms — h2https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css — 200 — 19.1 KiB — 35 ms — h3https://fernandolaserna.com/prueba6/css/main.css/prueba6/css/main.css https://fernandolaserna.com/prueba6/css/main.css — 200 — 215 B — 96 ms — h2https://fernandolaserna.com/prueba6/js/main.js/prueba6/js/main.js https://fernandolaserna.com/prueba6/js/main.js — 200 — 494 B — 92 ms — h2https://fernandolaserna.com/prueba6/js/navbar.js/prueba6/js/navbar.js https://fernandolaserna.com/prueba6/js/navbar.js — 200 — 315 B — 97 ms — h2https://fernandolaserna.com/prueba6/js/hero-canvas.js/prueba6/js/hero-canvas.js https://fernandolaserna.com/prueba6/js/hero-canvas.js — 200 — 694 B — 95 ms — h2https://fernandolaserna.com/prueba6/js/reveal.js/prueba6/js/reveal.js https://fernandolaserna.com/prueba6/js/reveal.js — 200 — 270 B — 93 ms — h2https://fernandolaserna.com/prueba6/js/faq.js/prueba6/js/faq.js https://fernandolaserna.com/prueba6/js/faq.js — 200 — 234 B — 91 ms — h2https://fernandolaserna.com/prueba6/js/modal.js/prueba6/js/modal.js https://fernandolaserna.com/prueba6/js/modal.js — 200 — 283 B — 406 ms — h2https://fernandolaserna.com/prueba6/js/form.js/prueba6/js/form.js https://fernandolaserna.com/prueba6/js/form.js — 200 — 373 B — 404 ms — h2https://fernandolaserna.com/prueba6/js/smooth-scroll.js/prueba6/js/smooth-scroll.js https://fernandolaserna.com/prueba6/js/smooth-scroll.js — 200 — 301 B — 407 ms — h2https://fernandolaserna.com/prueba6/js/cookie-consent.js/prueba6/js/cookie-consent.js https://fernandolaserna.com/prueba6/js/cookie-consent.js — 200 — 2.1 KiB — 408 ms — h2https://fernandolaserna.com/prueba6/css/variables.css/prueba6/css/variables.css https://fernandolaserna.com/prueba6/css/variables.css — 200 — 486 B — 98 ms — h2https://fernandolaserna.com/prueba6/css/base.css/prueba6/css/base.css https://fernandolaserna.com/prueba6/css/base.css — 200 — 291 B — 364 ms — h2https://fernandolaserna.com/prueba6/css/layout.css/prueba6/css/layout.css https://fernandolaserna.com/prueba6/css/layout.css — 200 — 332 B — 372 ms — h2https://fernandolaserna.com/prueba6/css/components/navbar.css/prueba6/css/components/navbar.css https://fernandolaserna.com/prueba6/css/components/navbar.css — 200 — 844 B — 365 ms — h2https://fernandolaserna.com/prueba6/css/components/hero.css/prueba6/css/components/hero.css https://fernandolaserna.com/prueba6/css/components/hero.css — 200 — 1022 B — 368 ms — h2https://fernandolaserna.com/prueba6/css/components/pain-points.css/prueba6/css/components/pain-points... https://fernandolaserna.com/prueba6/css/components/pain-points.css — 200 — 483 B — 369 ms — h2https://fernandolaserna.com/prueba6/css/components/services.css/prueba6/css/components/services.cs... https://fernandolaserna.com/prueba6/css/components/services.css — 200 — 510 B — 366 ms — h2https://fernandolaserna.com/prueba6/css/components/proyectos.css/prueba6/css/components/proyectos.c... https://fernandolaserna.com/prueba6/css/components/proyectos.css — 200 — 635 B — 397 ms — h2https://fernandolaserna.com/prueba6/css/components/proceso.css/prueba6/css/components/proceso.css https://fernandolaserna.com/prueba6/css/components/proceso.css — 200 — 441 B — 391 ms — h2https://fernandolaserna.com/prueba6/css/components/farmacias.css/prueba6/css/components/farmacias.c... https://fernandolaserna.com/prueba6/css/components/farmacias.css — 200 — 1.0 KiB — 387 ms — h2https://fernandolaserna.com/prueba6/css/components/faq.css/prueba6/css/components/faq.css https://fernandolaserna.com/prueba6/css/components/faq.css — 200 — 405 B — 392 ms — h2https://fernandolaserna.com/prueba6/css/components/cta.css/prueba6/css/components/cta.css https://fernandolaserna.com/prueba6/css/components/cta.css — 200 — 445 B — 394 ms — h2https://fernandolaserna.com/prueba6/css/components/footer.css/prueba6/css/components/footer.css https://fernandolaserna.com/prueba6/css/components/footer.css — 200 — 514 B — 383 ms — h2https://fernandolaserna.com/prueba6/css/components/modal.css/prueba6/css/components/modal.css https://fernandolaserna.com/prueba6/css/components/modal.css — 200 — 777 B — 397 ms — h2https://fernandolaserna.com/prueba6/css/components/cookie-consent.css/prueba6/css/components/cookie-cons... https://fernandolaserna.com/prueba6/css/components/cookie-consent.css — 200 — 1.2 KiB — 392 ms — h2https://fernandolaserna.com/prueba6/css/components/legal.css/prueba6/css/components/legal.css https://fernandolaserna.com/prueba6/css/components/legal.css — 200 — 710 B — 384 ms — h2https://fernandolaserna.com/prueba6/css/components/reveal.css/prueba6/css/components/reveal.css https://fernandolaserna.com/prueba6/css/components/reveal.css — 200 — 238 B — 386 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 3.8 s LCP 3.8 shttps://fernandolaserna.com/prueba6/index.html/prueba6/index.html https://fernandolaserna.com/prueba6/index.html — 200 — 7.3 KiB — 358 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Space+Grotesk:wght@400;500;600;700&display=swap — 200 — 1.5 KiB — 47 ms — h2https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css — 200 — 19.1 KiB — 35 ms — h3https://fernandolaserna.com/prueba6/css/main.css/prueba6/css/main.css https://fernandolaserna.com/prueba6/css/main.css — 200 — 215 B — 96 ms — h2https://fernandolaserna.com/prueba6/js/main.js/prueba6/js/main.js https://fernandolaserna.com/prueba6/js/main.js — 200 — 494 B — 92 ms — h2https://fernandolaserna.com/prueba6/js/navbar.js/prueba6/js/navbar.js https://fernandolaserna.com/prueba6/js/navbar.js — 200 — 315 B — 97 ms — h2https://fernandolaserna.com/prueba6/js/hero-canvas.js/prueba6/js/hero-canvas.js https://fernandolaserna.com/prueba6/js/hero-canvas.js — 200 — 694 B — 95 ms — h2https://fernandolaserna.com/prueba6/js/reveal.js/prueba6/js/reveal.js https://fernandolaserna.com/prueba6/js/reveal.js — 200 — 270 B — 93 ms — h2https://fernandolaserna.com/prueba6/js/faq.js/prueba6/js/faq.js https://fernandolaserna.com/prueba6/js/faq.js — 200 — 234 B — 91 ms — h2https://fernandolaserna.com/prueba6/js/modal.js/prueba6/js/modal.js https://fernandolaserna.com/prueba6/js/modal.js — 200 — 283 B — 406 ms — h2https://fernandolaserna.com/prueba6/js/form.js/prueba6/js/form.js https://fernandolaserna.com/prueba6/js/form.js — 200 — 373 B — 404 ms — h2https://fernandolaserna.com/prueba6/js/smooth-scroll.js/prueba6/js/smooth-scroll.js https://fernandolaserna.com/prueba6/js/smooth-scroll.js — 200 — 301 B — 407 ms — h2https://fernandolaserna.com/prueba6/js/cookie-consent.js/prueba6/js/cookie-consent.js https://fernandolaserna.com/prueba6/js/cookie-consent.js — 200 — 2.1 KiB — 408 ms — h2https://fernandolaserna.com/prueba6/css/variables.css/prueba6/css/variables.css https://fernandolaserna.com/prueba6/css/variables.css — 200 — 486 B — 98 ms — h2https://fernandolaserna.com/prueba6/css/base.css/prueba6/css/base.css https://fernandolaserna.com/prueba6/css/base.css — 200 — 291 B — 364 ms — h2https://fernandolaserna.com/prueba6/css/layout.css/prueba6/css/layout.css https://fernandolaserna.com/prueba6/css/layout.css — 200 — 332 B — 372 ms — h2https://fernandolaserna.com/prueba6/css/components/navbar.css/prueba6/css/components/navbar.css https://fernandolaserna.com/prueba6/css/components/navbar.css — 200 — 844 B — 365 ms — h2https://fernandolaserna.com/prueba6/css/components/hero.css/prueba6/css/components/hero.css https://fernandolaserna.com/prueba6/css/components/hero.css — 200 — 1022 B — 368 ms — h2https://fernandolaserna.com/prueba6/css/components/pain-points.css/prueba6/css/components/pain-points... https://fernandolaserna.com/prueba6/css/components/pain-points.css — 200 — 483 B — 369 ms — h2https://fernandolaserna.com/prueba6/css/components/services.css/prueba6/css/components/services.cs... https://fernandolaserna.com/prueba6/css/components/services.css — 200 — 510 B — 366 ms — h2https://fernandolaserna.com/prueba6/css/components/proyectos.css/prueba6/css/components/proyectos.c... https://fernandolaserna.com/prueba6/css/components/proyectos.css — 200 — 635 B — 397 ms — h2https://fernandolaserna.com/prueba6/css/components/proceso.css/prueba6/css/components/proceso.css https://fernandolaserna.com/prueba6/css/components/proceso.css — 200 — 441 B — 391 ms — h2https://fernandolaserna.com/prueba6/css/components/farmacias.css/prueba6/css/components/farmacias.c... 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1.2 KiB — 392 ms — h2https://fernandolaserna.com/prueba6/css/components/legal.css/prueba6/css/components/legal.css https://fernandolaserna.com/prueba6/css/components/legal.css — 200 — 710 B — 384 ms — h2https://fernandolaserna.com/prueba6/css/components/reveal.css/prueba6/css/components/reveal.css https://fernandolaserna.com/prueba6/css/components/reveal.css — 200 — 238 B — 386 ms — h2https://fernandolaserna.com/prueba6/css/responsive.css/prueba6/css/responsive.css https://fernandolaserna.com/prueba6/css/responsive.css — 200 — 494 B — 405 ms — h2https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2fonts.gstatic.com/s/inter/v20/UcC73... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 200 — 47.3 KiB — 9 ms — h3https://fonts.gstatic.com/s/spacegrotesk/v22/V8mDoQDjQSkFtoMM3T6r8E7mPbF4C_k3HqU.woff2fonts.gstatic.com/s/spacegrotesk/v2... 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