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Contrast Checker

Check WCAG color contrast ratios between any two colors

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https://minimaxh3.art

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

94

GRADE

A

FIX

1

REVIEW

3

PASS

19

INFO

3

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

90

Performance

87

Accessibility

96

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.82 s

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

3.01 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.

2.82 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.

3.02 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

26

19 PASS 3 REVIEW 1 FIX

D

HTTP Caching

Action

no-store (uncacheable)

FIX

no-store (uncacheable)

Cache-Control: no-store prevents all caching

Intentional for dynamic content, but increases server load for every page view.

Got: no-store, must-revalidate

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

no-store, must-revalidate

Directive	Value	Meaning
no-store	—	Never cache this response
must-revalidate	—	Must recheck with server after expiry

C

Image Optimization

Action

15 images, 0 KB saveable

REVIEW

15 images, 0 KB saveable

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.

https://minimaxh3.art/images/h3/case-3.jpg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://deeplaunch.io/badge/badge_dark.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://navfolders.com/badge/nav_dark.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://minimaxh3.art/logo.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://minimaxh3.art/images/h3/case-1.jpg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://minimaxh3.art/images/h3/case-2.jpg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://img.turbo0.com/badge-listed-light.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://www.freeai.run/badge/badge_dark.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://tooldirs.com/badge/badge_dark.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

15 images 3 KB

0 oversized -0 KB

8 legacy format

10 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

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

1389ms total JS execution

REVIEW

1389ms total JS execution

https://minimaxh3.art/: 704ms CPU time

Unattributable: 631ms CPU time

https://static.cloudflareinsights.com/beacon.min.j...: 55ms CPU time

Third-party scripts: 55ms (4% of total)

Main Thread Breakdown

Other 51% Style & Layout 17% Rendering 11% Script Evaluation 10% Parse HTML & CSS 6% Script Parsing & Compilation 4%

Script	Total	Scripting	Parse/Compile	Party
https://minimaxh3.art/	704ms	80ms	57ms	1st
Unattributable	631ms	14ms	0ms	1st
https://static.cloudflareinsights.com/beacon.min.js/v4513226cdae34746b4dedf0b4dfa099e1781791509496	55ms	37ms	1ms	3rd

C

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

113 KB transferred, 77 requests

PASS

113 KB transferred, 77 requests

Page weighs 289 KB (113 KB transferred)

77 HTTP requests

Estimated 0.02 g CO2 per page load

113 KB transferred

77 requests

0.02 g CO2 per page load

JavaScript 55.7 KiB 49%

HTML 44.3 KiB 39%

Fonts 6.0 KiB 5%

Images 4.2 KiB 4%

CSS 967 B 1%

Other 885 B 1%

Other 460 B 0%

Other 432 B 0%

Other 418 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

10% third-party, 0 ms blocking

PASS

10% third-party, 0 ms blocking

Third-party code accounts for 10% of page weight (11.3 KiB of 113.2 KiB)

Third-party blocking time is low (0 ms)

90%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

11 fonts (6 KB)

PASS

11 fonts (6 KB)

11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

6 KB total

Render-blocking

0

of 11

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

syne-bd7099ad.woff2 woff2 swap

Size 1 KB

Load time 359 ms

Start 608 ms

Risk FOUT — text flashes from fallback to web font

syne-f2eba987.woff2 woff2 swap

Size 1 KB

Load time 51 ms

Start 609 ms

Risk FOUT — text flashes from fallback to web font

syne-c37e2fa5.woff2 woff2 swap

Size 1 KB

Load time 365 ms

Start 609 ms

Risk FOUT — text flashes from fallback to web font

outfit-f37fa50e.woff2 woff2 swap

Size 1 KB

Load time 402 ms

Start 610 ms

Risk FOUT — text flashes from fallback to web font

outfit-c8e7a734.woff2 woff2 swap

Size 1 KB

Load time 374 ms

Start 610 ms

Risk FOUT — text flashes from fallback to web font

syne-f2eba987.woff2 woff2 swap

Size 1 KB

Load time 59 ms

Start 923 ms

Risk FOUT — text flashes from fallback to web font

syne-bd7099ad.woff2 woff2 swap

Size 1 KB

Load time 37 ms

Start 973 ms

Risk FOUT — text flashes from fallback to web font

syne-c37e2fa5.woff2 woff2 swap

Size 1 KB

Load time 31 ms

Start 978 ms

Risk FOUT — text flashes from fallback to web font

syne-f2eba987.woff2 woff2 swap

Size 1 KB

Load time 23 ms

Start 1.2 s

Risk FOUT — text flashes from fallback to web font

outfit-f37fa50e.woff2 woff2 swap

Size 1 KB

Load time 23 ms

Start 1.2 s

Risk FOUT — text flashes from fallback to web font

outfit-c8e7a734.woff2 woff2 swap

Size 1 KB

Load time 24 ms

Start 1.2 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)

A+

JS Bundles

48 scripts, 0 KB unused

PASS

48 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://minimaxh3.art/assets/global-error-CVl8f3Cz.js	1 KB	—	✓	1st
https://minimaxh3.art/assets/framework-DJH1pfSr.js	1 KB	—	✓	1st
https://minimaxh3.art/assets/rolldown-runtime-QTnfLwEv.js	1 KB	—	✓	1st
https://minimaxh3.art/assets/url-utils-BQKFb685.js	1 KB	—	✓	1st
https://minimaxh3.art/assets/error-CTeH-zPh.js	1 KB	—	✓	1st
https://minimaxh3.art/assets/navigation-BU7UluEi.js	1 KB	—	✓	1st
https://minimaxh3.art/assets/react-DlbkFqaW.js	1 KB	—	✓	1st
https://minimaxh3.art/assets/BaseLink-BYFyiPcl.js	1 KB	—	✓	1st
https://minimaxh3.art/assets/locale-CYgGTMW4.js	1 KB	—	✓	1st
https://minimaxh3.art/assets/react-client-CAjdHkmk.js	1 KB	—	✓	1st

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A

Resource Hints

7 hints, 0 missing preconnects

PASS

7 hints, 0 missing preconnects

5 font preload(s) missing `crossorigin` -- font will be downloaded twice

Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /assets/_vinext_fonts/syne-12293ae4f566/syne-bd7099ad.woff2, /assets/_vinext_fonts/syne-12293ae4f566/syne-f2eba987.woff2, /assets/_vinext_fonts/syne-12293ae4f566/syne-c37e2fa5.woff2 (+2 more). Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.

Page uses 7 resource hint(s)

Current Resource Hints

preconnect

—

preload

7

dns-prefetch

—

prefetch

—

7 resource hints configured

Fonts are always fetched as crossorigin=anonymous; a preload without the attribute creates a different cache key, so the browser refetches when the actual font request happens. Sample: /assets/_vinext_fonts/syne-12293ae4f566/syne-bd7099ad.woff2, /assets/_vinext_fonts/syne-12293ae4f566/syne-f2eba987.woff2, /assets/_vinext_fonts/syne-12293ae4f566/syne-c37e2fa5.woff2 (+2 more). Add `crossorigin` (or `crossorigin="anonymous"`) to each preload.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

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

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

LCP image preload audit not available for this scan

A+

Main HTML Cache-Control

Main HTML uses no-store -- correct for sensitive/dynamic content

PASS

Main HTML uses no-store -- correct for sensitive/dynamic content

Main HTML uses no-store -- correct for sensitive/dynamic content

Got: no-store, must-revalidate

A+

Server-Timing Observability

3 Server-Timing entries advertised

PASS

3 Server-Timing entries advertised

Server-Timing header advertises 3 timing entries

A+

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

`Vary` header declared: RSC, Accept, Next-Router-State-Tree, Next-Router-Prefetch, Next-Router-Segment-P...

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).

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

77 resources · 113 KB · 0 KB savings available

PASS

77 resources · 113 KB · 0 KB savings available

Within 1MB page-weight target

Got: 113 KB

2 third-party resources (10% of weight)

77 resources · 113.2 KiB · 2 third-party Within 1MB page-weight target

JavaScript 49% · 55.7 KiB

Document 39% · 44.3 KiB

Font 5% · 6.0 KiB

Image 4% · 4.2 KiB

Other 2% · 1.7 KiB

CSS 1% · 967 B

Media 0% · 432 B

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

77 resources			113.2 KiB

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

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

No JavaScript blocking issues detected

A

CSS Performance Depth

1 CSS depth issue(s) detected

PASS

1 CSS depth issue(s) detected

2 `@font-face` rule(s) without `font-display` -- causes FOIT

An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.

Network Waterfall

77 requests over 1483ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

4% of JavaScript execution is third-party

First-party Third-party 55ms · 11KB · €0/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
static.cloudflareinsights.com static.cloudflareinsights.com	Other	55ms	11 KB	—	€0/mo	Optional

static.cloudflareinsights.com

Other

Optional

Execution 55ms

Transfer 11 KB

Monthly Cost €0/mo

How third-party costs are calculated

Image Optimization

22 images, 1 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

22

Total Size

1 KB

17 missing dimensions 1 missing lazy loading

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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