Performance

· 21 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

SEO

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

838 ms

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

838 ms

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.

0.027

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

838 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.

838 ms

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

16 PASS 2 REVIEW 1 FIX

Third-Party Impact

Action

70% third-party, 0 ms blocking

FIX

70% third-party, 0 ms blocking

Third-party code accounts for 70% of page weight (88.8 KiB of 127.4 KiB)

Third-party blocking time is low (0 ms)

30%

70%

First-party Third-party

JS Execution Cost

715ms total JS execution

REVIEW

715ms total JS execution

https://letseat.charlietheturtle.com/: 586ms CPU time

Unattributable: 128ms CPU time

Main Thread Breakdown

Style & Layout 53% Other 29% Rendering 9% Script Evaluation 8%

Script	Total	Scripting	Parse/Compile	Party
https://letseat.charlietheturtle.com/	586ms	2ms	0ms	1st
Unattributable	128ms	51ms	0ms	1st

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

No ETag or Last-Modified header

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

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

127 KB transferred, 10 requests

PASS

127 KB transferred, 10 requests

Page weighs 263 KB (127 KB transferred)

10 HTTP requests

Estimated 0.03 g CO2 per page load

127 KB transferred

10 requests

0.03 g CO2 per page load

Fonts 87.7 KiB 69%

Other 22.9 KiB 18%

JavaScript 7.0 KiB 5%

CSS 4.8 KiB 4%

HTML 3.7 KiB 3%

Other 716 B 1%

Images 711 B 1%

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

1 images, 0 KB saveable

PASS

1 images, 0 KB saveable

All images are well-optimized

1 images 1 KB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

Font Loading

2 fonts (88 KB)

PASS

2 fonts (88 KB)

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

Web fonts

88 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

V8mDoQDjQSkFtoMM3T6r8E7... woff2 swap

Size 22 KB

Load time 12 ms

Start 223 ms

Risk FOUT — text flashes from fallback to web font

6NU78FyLNQOQZAnv9bYEvDi... woff2 swap

Size 66 KB

Load time 15 ms

Start 223 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

2 scripts, 0 KB unused

PASS

2 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://letseat.charlietheturtle.com/app.js	7 KB	—	✓	1st
https://static.cloudflareinsights.com/beacon.min.js/v3d52b47920f24c319d37e2661827c42b1787588026925	0 KB	—	✓	3rd

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+

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 max-age=0 (≤ 5min) is appropriate

PASS

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

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

A+

Server-Timing Observability

3 Server-Timing entries advertised

PASS

3 Server-Timing entries advertised

Server-Timing header advertises 3 timing entries

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.

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.

Page Weight Inventory

10 resources · 127 KB · 0 KB savings available

PASS

10 resources · 127 KB · 0 KB savings available

Within 1MB page-weight target

Got: 127 KB

4 third-party resources (70% of weight)

10 resources · 127.4 KiB · 4 third-party Within 1MB page-weight target

Font 69% · 87.7 KiB

Other 19% · 23.6 KiB

JavaScript 5% · 7.0 KiB

CSS 4% · 4.8 KiB

Document 3% · 3.7 KiB

Image 1% · 711 B

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

10 resources			127.4 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

Network Waterfall

10 requests over 709ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

200 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

200

Total Size

0 KB

200 missing dimensions

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.