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https://nomicalc.com

Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
3
REVIEW
5
PASS
15
INFO
2

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

Mobile Desktop
85
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.
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.

853 ms

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

853 ms

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

586 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.

1.41 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.

2.34 s

Page Load Progression

390 ms
781 ms
1.2 s
1.6 s
2.0 s
2.3 s
2.7 s
3.1 s
Checks
25
15 PASS 5 REVIEW 3 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 13 requests
FIX
3.0 MB transferred, 13 requests
Warning::
Page weighs 4.4 MB (3.0 MB transferred)
Info::
13 HTTP requests
Info::
Estimated 0.62 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
13 requests
0.62 g CO2 per page load
Other 2.4 MiB 81%
JavaScript 496.9 KiB 16%
Images 48.9 KiB 2%
Other 23.2 KiB 1%
CSS 10.4 KiB 0%
HTML 2.8 KiB 0%
Other 1.2 KiB 0%
0 2.4 MB 4.9 MB
Over budget
D
JS Execution Cost
Action
2821ms total JS execution
FIX
2821ms total JS execution
Warning::
https://nomicalc.com/: 1478ms CPU time
Warning::
Unattributable: 983ms CPU time
Warning::
https://nomicalc.com/assets/vendor-Boaau3YS.js: 359ms CPU time

Main Thread Breakdown

Other 42% Rendering 21% Script Evaluation 20% Style & Layout 16%
ScriptTotalScriptingParse/CompileParty
https://nomicalc.com/1478ms5ms2ms1st
Unattributable983ms249ms0ms1st
https://nomicalc.com/assets/vendor-Boaau3YS.js359ms293ms2ms1st
D
JS Bundles
Action
5 scripts, 380 KB unused
FIX
5 scripts, 380 KB unused
Warning::
https://nomicalc.com/assets/utils-CK9pFSIt.js: 201 KB unused (84%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://nomicalc.com/assets/index-UWFBqukz.js: 157 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://nomicalc.com/assets/supabase-9mFPMyoI.js: 22 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 380 KB
380 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://nomicalc.com/assets/utils-CK9pFSIt.js240 KB201 KB (84%)✓1st
https://nomicalc.com/assets/index-UWFBqukz.js179 KB157 KB (88%)✓1st
https://nomicalc.com/assets/supabase-9mFPMyoI.js27 KB22 KB (79%)✓1st
https://nomicalc.com/assets/vendor-Boaau3YS.js43 KB—✓1st
https://nomicalc.com/assets/router-Cw9v9Kbq.js8 KB—✓1st

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

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
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
Page Weight Inventory
Action
13 resources · 3.0 MB · 380 KB savings available
REVIEW
13 resources · 3.0 MB · 380 KB savings available
Warning::
Page weight 3.0 MB exceeds 1 MB target by 2.0 MB
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~380 KB of savings available
Info::
2 resources over 200KB
13 resources · 3.0 MiB · 0 third-party 2.0 MiB over 1MB target
Media 81% · 2.4 MiB
JavaScript 16% · 496.9 KiB
Image 2% · 72.0 KiB
CSS 0% · 10.4 KiB
Document 0% · 2.8 KiB
Other 0% · 1.2 KiB

~380.0 KiB of savings available

Remove unused JavaScript: 380.0 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public,max-age=0,must-revalidate
REVIEW
public,max-age=0,must-revalidate
Info::
Cache-Control header is set
Got: public,max-age=0,must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

public,max-age=0,must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
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
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 49 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
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+
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public,max-age=0,must-revalidate
A+
Server Response Intelligence
3 server-response signal(s) detected
PASS
3 server-response signal(s) detected
Info::
`Cache-Status` header present (RFC 9211): "Netlify Edge"; fwd=miss
The page returns a `Cache-Status` header -- the standardized way for CDNs and caches to communicate per-hop cache state to debugging tools. Format: `Cache-Status: cdn-name; hit; ttl=300` (or `; fwd=miss` / `; fwd=stale`). Standard alternative to vendor-specific `X-Cache` patterns each CDN had historically. Cloudflare, Fastly, and Akamai all support emitting it.
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::
`ETag` present -- conditional GET supported
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
13 requests over 1004ms
INFO
0 ms 500 ms 1.0 s FCP 853 ms LCP 853 mshttps://nomicalc.com// https://nomicalc.com/ — 200 — 2.8 KiB — 27 ms — h2https://nomicalc.com/assets/index-UWFBqukz.js/assets/index-UWFBqukz.js https://nomicalc.com/assets/index-UWFBqukz.js — 200 — 179.0 KiB — 328 ms — h2https://nomicalc.com/assets/vendor-Boaau3YS.js/assets/vendor-Boaau3YS.js https://nomicalc.com/assets/vendor-Boaau3YS.js — 200 — 42.7 KiB — 174 ms — h2https://nomicalc.com/assets/router-Cw9v9Kbq.js/assets/router-Cw9v9Kbq.js https://nomicalc.com/assets/router-Cw9v9Kbq.js — 200 — 7.8 KiB — 166 ms — h2https://nomicalc.com/assets/supabase-9mFPMyoI.js/assets/supabase-9mFPMyoI.js https://nomicalc.com/assets/supabase-9mFPMyoI.js — 200 — 27.5 KiB — 170 ms — h2https://nomicalc.com/assets/utils-CK9pFSIt.js/assets/utils-CK9pFSIt.js https://nomicalc.com/assets/utils-CK9pFSIt.js — 200 — 239.9 KiB — 185 ms — h2https://nomicalc.com/assets/index-BKezEPRe.css/assets/index-BKezEPRe.css https://nomicalc.com/assets/index-BKezEPRe.css — 200 — 10.4 KiB — 66 ms — h2https://nomicalc.com/manifest.webmanifest/manifest.webmanifest https://nomicalc.com/manifest.webmanifest — 200 — 1.2 KiB — 156 ms — h2https://nomicalc.com/favicon.ico/favicon.ico https://nomicalc.com/favicon.ico — 200 — 9.6 KiB — 66 ms — h2https://nomicalc.com/assets/logo-192.png/assets/logo-192.png https://nomicalc.com/assets/logo-192.png — 200 — 13.5 KiB — 221 ms — h2https://nomicalc.com/assets/logo-DDG7Rcd-.png/assets/logo-DDG7Rcd-.png https://nomicalc.com/assets/logo-DDG7Rcd-.png — 200 — 48.9 KiB — 181 ms — h2https://nomicalc.com/aterrizando_el_avion.mp4/aterrizando_el_avion.mp4 https://nomicalc.com/aterrizando_el_avion.mp4 — 206 — 2.4 MiB — 324 ms — h2https://nomicalc.com/logo.mp4/logo.mp4 https://nomicalc.com/logo.mp4 — 206 — 8.3 KiB — 79 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
2 images, 97 KB total, 46 KB wasted
INFO

Image Optimization Audit

Total Images

2

Total Size

97 KB

Oversized

1

Wasted

46 KB

2 missing dimensions
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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