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Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
97
GRADE
A+
FIX
0
REVIEW
4
PASS
15
INFO
3

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

Mobile Desktop
100
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.
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.

407 ms

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

816 ms

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

14 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.

407 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.34 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
22
15 PASS 4 REVIEW
B
Third-Party Impact
46% third-party, 0 ms blocking
REVIEW
46% third-party, 0 ms blocking
Info::
Third-party code accounts for 46% of page weight (415.4 KiB of 904.7 KiB)
Info::
Third-party blocking time is low (0 ms)
54%
46%
First-party Third-party
C
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://tooldirs.com/badge/badge_dark.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.toolpilot.ai/cdn/shop/files/f-b_690x15... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://firstlook.tools/badge/badge_dark.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img.turbo0.com/badge-listed-light.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://navfolders.com/badge/nav_dark.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://startupfa.st/images/badges/powered-by-ligh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://toolrain.com/badges/badge-listed-light.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.freeai.run/badge/badge_dark.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://deeplaunch.io/badge/badge_dark.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 517 KB
0 oversized -0 KB
9 legacy format
9 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

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

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

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.
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::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
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
Page Weight Budget
905 KB transferred, 58 requests
PASS
905 KB transferred, 58 requests
Info::
Page weighs 1.8 MB (905 KB transferred)
Info::
58 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
905 KB / 2.4 MB budget
905 KB transferred
58 requests
0.19 g CO2 per page load
Images 516.7 KiB 57%
JavaScript 251.3 KiB 28%
Other 63.6 KiB 7%
Fonts 58.0 KiB 6%
HTML 7.5 KiB 1%
CSS 6.6 KiB 1%
Other 1.0 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
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+
JS Execution Cost
211ms total JS execution
PASS
211ms total JS execution
Info::
https://samplab.pro/_next/static/chunks/app/audio-...: 78ms CPU time
Info::
Unattributable: 77ms CPU time
Info::
https://samplab.pro/: 56ms CPU time

Main Thread Breakdown

Script Evaluation 54% Other 24% Style & Layout 11% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://samplab.pro/_next/static/chunks/app/audio-to-midi/page-a8d32fdc1e43ea7a.js78ms77ms0ms1st
Unattributable77ms6ms0ms1st
https://samplab.pro/56ms6ms2ms1st
A+
Font Loading
2 fonts (58 KB)
PASS
2 fonts (58 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

58 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 407 ms LCP 816 mshttps://samplab.pro/_next/static/media/190cd984471a34c4-s.p.woff2190cd984471a34c4-s.p.woff2 https://samplab.pro/_next/static/media/190cd984471a34c4-s.p.woff2 — 10.2 KiB — 76 ms — font-display: swaphttps://samplab.pro/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://samplab.pro/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 47.8 KiB — 81 ms — font-display: swap
190cd984471a34c4-s.p.woff2 woff2 swap
Size 10 KB
Load time 76 ms
Start 187 ms
Risk FOUT — text flashes from fallback to web font
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 81 ms
Start 187 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+
JS Bundles
26 scripts, 46 KB unused
PASS
26 scripts, 46 KB unused
Warning::
https://samplab.pro/_next/static/chunks/767-a53c9c...: 46 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 46 KB
46 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://samplab.pro/_next/static/chunks/767-a53c9c174cec813a.js61 KB46 KB (76%)✓1st
https://samplab.pro/_next/static/chunks/app/chord-recognition/page-ce9cf2b1a0149675.js4 KB—✓1st
https://samplab.pro/_next/static/chunks/app/lead-sheet-generator/page-543ecef19aa3e074.js9 KB—✓1st
https://samplab.pro/_next/static/chunks/255-adcf5b368b0d93bf.js44 KB—✓1st
https://samplab.pro/_next/static/chunks/main-app-74e16c0599361379.js1 KB—✓1st
https://samplab.pro/_next/static/chunks/619-f072ac750404f9da.js4 KB—✓1st
https://samplab.pro/_next/static/chunks/542-37825f9bb74d05aa.js4 KB—✓1st
https://samplab.pro/_next/static/chunks/app/layout-68febeed25b0ee9e.js10 KB—✓1st
https://samplab.pro/_next/static/chunks/app/page-97dcbab851d92e8a.js1 KB—✓1st
https://samplab.pro/_next/static/chunks/590-8d6e1ae1d46ce069.js4 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

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+
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+
Document Compression
Document response uses brotli
PASS
Document 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
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::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A
Page Weight Inventory
58 resources · 905 KB · 46 KB savings available
PASS
58 resources · 905 KB · 46 KB savings available
Info::
Within 1MB page-weight target
Got: 905 KB
Warning::
14 third-party resources (46% of weight)
Info::
1 resources over 200KB
58 resources · 904.7 KiB · 14 third-party Within 1MB page-weight target
Image 57% · 517.6 KiB
JavaScript 28% · 251.3 KiB
Other 7% · 63.8 KiB
Font 6% · 58.0 KiB
Document 1% · 7.5 KiB
CSS 1% · 6.6 KiB

~46.1 KiB of savings available

Remove unused JavaScript: 46.1 KiB
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
58 requests over 711ms
INFO
0 ms 200 ms 400 ms 600 ms 800 ms FCP 407 ms LCP 816 mshttps://samplab.pro// https://samplab.pro/ — 200 — 7.5 KiB — 178 ms — h3https://umami.bestvid.net/script.jsumami.bestvid.net/script.js https://umami.bestvid.net/script.js — 200 — 0 B — 7 ms — h3https://samplab.pro/_next/static/media/190cd984471a34c4-s.p.woff2/_next/static/media/190cd984471a34c... https://samplab.pro/_next/static/media/190cd984471a34c4-s.p.woff2 — 200 — 10.2 KiB — 76 ms — h3https://samplab.pro/_next/static/media/e4af272ccee01ff0-s.p.woff2/_next/static/media/e4af272ccee01ff... https://samplab.pro/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 47.8 KiB — 81 ms — h3https://samplab.pro/_next/static/css/9389a3627df59d4b.css/_next/static/css/9389a3627df59d4b.... https://samplab.pro/_next/static/css/9389a3627df59d4b.css — 200 — 6.6 KiB — 55 ms — h3https://samplab.pro/_next/static/chunks/webpack-0c792a2822d13798.js/_next/static/chunks/webpack-0c792a... https://samplab.pro/_next/static/chunks/webpack-0c792a2822d13798.js — 200 — 2.5 KiB — 51 ms — h3https://samplab.pro/_next/static/chunks/4bd1b696-409494caf8c83275.js/_next/static/chunks/4bd1b696-40949... https://samplab.pro/_next/static/chunks/4bd1b696-409494caf8c83275.js — 200 — 53.7 KiB — 77 ms — h3https://samplab.pro/_next/static/chunks/255-adcf5b368b0d93bf.js/_next/static/chunks/255-adcf5b368b... https://samplab.pro/_next/static/chunks/255-adcf5b368b0d93bf.js — 200 — 44.4 KiB — 78 ms — h3https://samplab.pro/_next/static/chunks/main-app-74e16c0599361379.js/_next/static/chunks/main-app-74e16... https://samplab.pro/_next/static/chunks/main-app-74e16c0599361379.js — 200 — 758 B — 81 ms — h3https://samplab.pro/_next/static/chunks/619-f072ac750404f9da.js/_next/static/chunks/619-f072ac7504... https://samplab.pro/_next/static/chunks/619-f072ac750404f9da.js — 200 — 3.9 KiB — 44 ms — h3https://samplab.pro/_next/static/chunks/542-37825f9bb74d05aa.js/_next/static/chunks/542-37825f9bb7... https://samplab.pro/_next/static/chunks/542-37825f9bb74d05aa.js — 200 — 4.1 KiB — 81 ms — h3https://samplab.pro/_next/static/chunks/app/layout-68febeed25b0ee9e.js/_next/static/chunks/app/layout-68f... https://samplab.pro/_next/static/chunks/app/layout-68febeed25b0ee9e.js — 200 — 9.6 KiB — 83 ms — h3https://samplab.pro/_next/static/chunks/app/page-97dcbab851d92e8a.js/_next/static/chunks/app/page-97dcb... https://samplab.pro/_next/static/chunks/app/page-97dcbab851d92e8a.js — 200 — 686 B — 83 ms — h3https://samplab.pro/visuals/tool-midi-800.webp/visuals/tool-midi-800.webp https://samplab.pro/visuals/tool-midi-800.webp — 200 — 27.3 KiB — 37 ms — h3https://samplab.pro/visuals/tool-tempo-800.webp/visuals/tool-tempo-800.webp https://samplab.pro/visuals/tool-tempo-800.webp — 200 — 7.1 KiB — 41 ms — h3https://samplab.pro/visuals/tool-chords-800.webp/visuals/tool-chords-800.webp https://samplab.pro/visuals/tool-chords-800.webp — 200 — 12.2 KiB — 47 ms — h3https://samplab.pro/visuals/tool-stems-800.webp/visuals/tool-stems-800.webp https://samplab.pro/visuals/tool-stems-800.webp — 200 — 5.9 KiB — 44 ms — h3https://samplab.pro/visuals/tool-render-800.webp/visuals/tool-render-800.webp https://samplab.pro/visuals/tool-render-800.webp — 200 — 33.1 KiB — 46 ms — h3https://samplab.pro/visuals/tool-sheet-800.webp/visuals/tool-sheet-800.webp https://samplab.pro/visuals/tool-sheet-800.webp — 200 — 17.0 KiB — 47 ms — h3https://www.freeai.run/badge/badge_dark.svgwww.freeai.run/badge/badge_dark.svg https://www.freeai.run/badge/badge_dark.svg — 200 — 263.4 KiB — 160 ms — h3https://tooldirs.com/badge/badge_dark.svgtooldirs.com/badge/badge_dark.svg https://tooldirs.com/badge/badge_dark.svg — 200 — 51.9 KiB — 99 ms — h3https://www.toolpilot.ai/cdn/shop/files/f-b_690x151_crop_center.pngwww.toolpilot.ai/cdn/shop/files/f-b... https://www.toolpilot.ai/cdn/shop/files/f-b_690x151_crop_center.png — 200 — 3.3 KiB — 112 ms — h2https://startupfa.st/images/badges/powered-by-light.svgstartupfa.st/images/badges/powered-... https://startupfa.st/images/badges/powered-by-light.svg — 307 — 182 B — 86 ms — h2https://deeplaunch.io/badge/badge_dark.svgdeeplaunch.io/badge/badge_dark.svg https://deeplaunch.io/badge/badge_dark.svg — 200 — 35.2 KiB — 73 ms — h3https://firstlook.tools/badge/badge_dark.svgfirstlook.tools/badge/badge_dark.sv... https://firstlook.tools/badge/badge_dark.svg — 200 — 25.9 KiB — 97 ms — h3https://img.turbo0.com/badge-listed-light.svgimg.turbo0.com/badge-listed-light.s... https://img.turbo0.com/badge-listed-light.svg — 200 — 3.7 KiB — 78 ms — h3https://toolrain.com/badges/badge-listed-light.svgtoolrain.com/badges/badge-listed-li... https://toolrain.com/badges/badge-listed-light.svg — 200 — 2.2 KiB — 279 ms — h3https://navfolders.com/badge/nav_dark.svgnavfolders.com/badge/nav_dark.svg https://navfolders.com/badge/nav_dark.svg — 200 — 948 B — 105 ms — h3https://www.startupfa.st/images/badges/powered-by-light.svgwww.startupfa.st/images/badges/powe... https://www.startupfa.st/images/badges/powered-by-light.svg — 200 — 27.6 KiB — 73 ms — h3https://samplab.pro/icon.svg?f301e67206de0a2f/icon.svg?f301e67206de0a2f https://samplab.pro/icon.svg?f301e67206de0a2f — 200 — 871 B — 53 ms — h3
0 ms 200 ms 400 ms 600 ms 800 ms FCP 407 ms LCP 816 mshttps://samplab.pro// https://samplab.pro/ — 200 — 7.5 KiB — 178 ms — h3https://umami.bestvid.net/script.jsumami.bestvid.net/script.js https://umami.bestvid.net/script.js — 200 — 0 B — 7 ms — h3https://samplab.pro/_next/static/media/190cd984471a34c4-s.p.woff2/_next/static/media/190cd984471a34c... https://samplab.pro/_next/static/media/190cd984471a34c4-s.p.woff2 — 200 — 10.2 KiB — 76 ms — h3https://samplab.pro/_next/static/media/e4af272ccee01ff0-s.p.woff2/_next/static/media/e4af272ccee01ff... https://samplab.pro/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 47.8 KiB — 81 ms — h3https://samplab.pro/_next/static/css/9389a3627df59d4b.css/_next/static/css/9389a3627df59d4b.... https://samplab.pro/_next/static/css/9389a3627df59d4b.css — 200 — 6.6 KiB — 55 ms — h3https://samplab.pro/_next/static/chunks/webpack-0c792a2822d13798.js/_next/static/chunks/webpack-0c792a... 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https://samplab.pro/_next/static/chunks/542-37825f9bb74d05aa.js — 200 — 4.1 KiB — 81 ms — h3https://samplab.pro/_next/static/chunks/app/layout-68febeed25b0ee9e.js/_next/static/chunks/app/layout-68f... https://samplab.pro/_next/static/chunks/app/layout-68febeed25b0ee9e.js — 200 — 9.6 KiB — 83 ms — h3https://samplab.pro/_next/static/chunks/app/page-97dcbab851d92e8a.js/_next/static/chunks/app/page-97dcb... https://samplab.pro/_next/static/chunks/app/page-97dcbab851d92e8a.js — 200 — 686 B — 83 ms — h3https://samplab.pro/visuals/tool-midi-800.webp/visuals/tool-midi-800.webp https://samplab.pro/visuals/tool-midi-800.webp — 200 — 27.3 KiB — 37 ms — h3https://samplab.pro/visuals/tool-tempo-800.webp/visuals/tool-tempo-800.webp https://samplab.pro/visuals/tool-tempo-800.webp — 200 — 7.1 KiB — 41 ms — h3https://samplab.pro/visuals/tool-chords-800.webp/visuals/tool-chords-800.webp https://samplab.pro/visuals/tool-chords-800.webp — 200 — 12.2 KiB — 47 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization
15 images, 29 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

15

Total Size

29 KB

9 missing dimensions
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