Performance

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

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.

952 ms

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

2.44 s

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

893 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.

4.08 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.

6.27 s

Page Load Progression

378 ms

755 ms

1.1 s

1.5 s

1.9 s

2.3 s

2.6 s

3.0 s

Checks

17 PASS 5 REVIEW 1 FIX

JS Execution Cost

Action

9785ms total JS execution

FIX

9785ms total JS execution

https://arklaystudio.com/assets/index-DWD03rnV.js: 7385ms CPU time

https://arklaystudio.com/assets/vendor-react-BKAeg...: 1524ms CPU time

https://arklaystudio.com/: 683ms CPU time

Unattributable: 193ms CPU time

Main Thread Breakdown

Other 86% Script Evaluation 6% Style & Layout 5% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
https://arklaystudio.com/assets/index-DWD03rnV.js	7385ms	128ms	1ms	1st
https://arklaystudio.com/assets/vendor-react-BKAeg5Wq.js	1524ms	382ms	0ms	1st
https://arklaystudio.com/	683ms	4ms	1ms	1st
Unattributable	193ms	23ms	0ms	1st

Third-Party Impact

58% third-party, 0 ms blocking

REVIEW

58% third-party, 0 ms blocking

Third-party code accounts for 58% of page weight (194.8 KiB of 336.4 KiB)

Third-party blocking time is low (0 ms)

42%

58%

First-party Third-party

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

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.

Server-Timing Observability

No Server-Timing header found

REVIEW

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.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

public, max-age=0, must-revalidate

REVIEW

public, max-age=0, must-revalidate

Cache-Control header is set

Got: public, max-age=0, must-revalidate

ETag present — enables conditional (304) responses

Last-Modified header present

Cache-Control

public, max-age=0, must-revalidate

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

A+

Page Weight Budget

336 KB transferred, 14 requests

PASS

336 KB transferred, 14 requests

Page weighs 675 KB (336 KB transferred)

14 HTTP requests

Estimated 0.07 g CO2 per page load

336 KB transferred

14 requests

0.07 g CO2 per page load

Images 219.0 KiB 65%

JavaScript 105.0 KiB 31%

CSS 10.4 KiB 3%

HTML 2.0 KiB 1%

Other 46 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

All text resources are properly compressed.

A+

Image Optimization

7 images, 0 KB saveable

PASS

7 images, 0 KB saveable

All images are well-optimized

7 images 219 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)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A+

JS Bundles

3 scripts, 0 KB unused

PASS

3 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://arklaystudio.com/assets/index-DWD03rnV.js	43 KB	—	✓	1st
https://arklaystudio.com/assets/rolldown-runtime-WkwZ5CU-.js	1 KB	—	✓	1st
https://arklaystudio.com/assets/vendor-react-BKAeg5Wq.js	61 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

4 hints, 0 missing preconnects

PASS

4 hints, 0 missing preconnects

Page uses 4 resource hint(s)

Current Resource Hints

preconnect

preload

—

dns-prefetch

prefetch

—

4 resource hints configured

A+

Document Compression

Document response uses brotli

PASS

Document 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 max-age=0 (≤ 5min) is appropriate

PASS

Main HTML max-age=0 (≤ 5min) is appropriate

Got: public, max-age=0, must-revalidate

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

Compressed response missing `Vary` header

The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.

Both `ETag` and `Last-Modified` present -- efficient revalidation supported

The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).

Page Weight Inventory

14 resources · 336 KB · 0 KB savings available

PASS

14 resources · 336 KB · 0 KB savings available

Within 1MB page-weight target

Got: 336 KB

7 third-party resources (58% of weight)

14 resources · 336.4 KiB · 7 third-party Within 1MB page-weight target

Image 65% · 219.0 KiB

JavaScript 31% · 105.0 KiB

CSS 3% · 10.4 KiB

Document 1% · 2.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

14 resources			336.4 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

JavaScript Blocking

1 JS blocking issue(s) detected

PASS

1 JS blocking issue(s) detected

Total JS execution time is 9.8 s -- over the 3.5s budget

Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

Asset Compression

No text asset hosts to measure

INFO

No text asset hosts to measure

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

14 requests over 666ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

23 images, 628 KB total, 25 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

628 KB

Oversized

Wasted

25 KB

15 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.