Performance

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

SCORE

GRADE

A+

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

100

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.

853 ms

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

2.90 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.

853 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.

2.90 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

17 PASS 1 REVIEW 1 FIX

Page Weight Budget

Action

2.4 MB transferred, 63 requests

FIX

2.4 MB transferred, 63 requests

Page weighs 2.9 MB (2.4 MB transferred)

Images are 2.2 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 2.2 MB

63 HTTP requests

Estimated 0.51 g CO2 per page load

2.4 MB transferred

63 requests

0.51 g CO2 per page load

Images 2.2 MiB 89%

JavaScript 219.4 KiB 9%

HTML 18.8 KiB 1%

CSS 17.2 KiB 1%

Other 7.0 KiB 0%

Other 1.6 KiB 0%

Other 1.3 KiB 0%

0 2.4 MB 4.9 MB

Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Page Weight Inventory

Action

63 resources · 2.4 MB · 30 KB savings available

REVIEW

63 resources · 2.4 MB · 30 KB savings available

Page weight 2.4 MB exceeds 1 MB target by 1.4 MB

Got: 2.4 MB Expected: ≤ 1 MB

1 third-party resources (0% of weight)

5 resources over 200KB

63 resources · 2.4 MiB · 1 third-party 1.4 MiB over 1MB target

Image 90% · 2.2 MiB

JavaScript 9% · 219.4 KiB

Document 1% · 18.8 KiB

CSS 1% · 17.2 KiB

Other 0% · 3.0 KiB

~29.7 KiB of savings available

Remove unused JavaScript: 29.7 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

63 resources			2.4 MiB

A+

Third-Party Impact

0% third-party, 0 ms blocking

PASS

0% third-party, 0 ms blocking

Third-party code accounts for 0% of page weight (10.1 KiB of 2.4 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Image Optimization

11 images, 0 KB saveable

PASS

11 images, 0 KB saveable

https://lacia.life/assets/misaki.webp is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

11 images 2.2 MB

0 oversized -0 KB

0 legacy format

1 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

A+

JS Execution Cost

356ms total JS execution

PASS

356ms total JS execution

https://lacia.life/: 179ms CPU time

Unattributable: 103ms CPU time

https://lacia.life/assets/index-V4LMfLtM.js: 75ms CPU time

Main Thread Breakdown

Other 52% Script Evaluation 22% Style & Layout 21%

Script	Total	Scripting	Parse/Compile	Party
https://lacia.life/	179ms	5ms	1ms	1st
Unattributable	103ms	6ms	0ms	1st
https://lacia.life/assets/index-V4LMfLtM.js	75ms	64ms	0ms	1st

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

45 scripts, 30 KB unused

PASS

45 scripts, 30 KB unused

https://lacia.life/assets/index-V4LMfLtM.js: 30 KB unused (39%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 30 KB

30 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://lacia.life/assets/index-V4LMfLtM.js	77 KB	30 KB (39%)	✓	1st
https://lacia.life/assets/react-SIfiwpqq.js	4 KB	—	✓	1st
https://lacia.life/assets/react-dom-x9LNwWQc.js	2 KB	—	✓	1st
https://lacia.life/assets/createServerFn-BeC4yHFw.js	12 KB	—	✓	1st
https://lacia.life/assets/link-5skObtIq.js	8 KB	—	✓	1st
https://lacia.life/assets/useMatch-BI2N-WL4.js	1 KB	—	✓	1st
https://lacia.life/assets/lazyRouteComponent-T-iC1a3V.js	2 KB	—	✓	1st
https://lacia.life/assets/jsx-runtime-0vZSBttN.js	1 KB	—	✓	1st
https://lacia.life/assets/Match-BEA91Y5m.js	2 KB	—	✓	1st
https://lacia.life/assets/useQuery-ClP069dU.js	8 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

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

No optimization needed

PASS

No optimization needed

No resource hint issues

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+

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=30 (≤ 5min) is appropriate

PASS

Main HTML max-age=30 (≤ 5min) is appropriate

Got: private, max-age=30, 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: 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).

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+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

HTTP Caching

max-age=30 (30 seconds)

PASS

max-age=30 (30 seconds)

Cache-Control header is set

Got: private, max-age=30, must-revalidate

Effective TTL: 30 seconds (max-age=30)

No ETag or Last-Modified header

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

Cache-Control

private, max-age=30, must-revalidate

Directive	Value	Meaning
private	—	Only browser cache, not CDN/proxy
max-age	30	Cache for 30 seconds
must-revalidate	—	Must recheck with server after expiry

Effective TTL: 30 seconds

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

63 requests over 1349ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

11 images, 823 KB total, 374 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

823 KB

Oversized

Wasted

374 KB

11 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.