Performance

· 23 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

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.

564 ms

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

1.58 s

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

41 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.013

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

1.00 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.

1.58 s

Page Load Progression

1.1 s

2.1 s

3.1 s

4.2 s

5.2 s

6.3 s

7.3 s

8.4 s

Checks

15 PASS 4 REVIEW

JS Execution Cost

523ms total JS execution

REVIEW

523ms total JS execution

https://stocktostove.com/: 264ms CPU time

https://www.googletagmanager.com/gtag/js?id=G-XE1F...: 145ms CPU time

Unattributable: 115ms CPU time

Third-party scripts: 145ms (28% of total)

Main Thread Breakdown

Other 39% Script Evaluation 32% Style & Layout 15% Rendering 7% Script Parsing & Compilation 4%

Script	Total	Scripting	Parse/Compile	Party
https://stocktostove.com/	264ms	11ms	3ms	1st
https://www.googletagmanager.com/gtag/js?id=G-XE1FVB6MSP	145ms	122ms	21ms	3rd
Unattributable	115ms	15ms	0ms	1st

JS Bundles

4 scripts, 73 KB unused

REVIEW

4 scripts, 73 KB unused

https://www.googletagmanager.com/gtag/js?id=G-XE1F...: 73 KB unused (43%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 73 KB

73 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.googletagmanager.com/gtag/js?id=G-XE1FVB6MSP	171 KB	73 KB (43%)	✓	3rd
https://stocktostove.com/_astro/page.DDsIKVU2.js	2 KB	—	✓	1st
https://stocktostove.com/_astro/IngredientPicker.astro_astro_type_script_index_0_lang.CW-bq8Jk.js	4 KB	—	✓	1st
https://static.cloudflareinsights.com/beacon.min.js/v31edd6df95cf4e85bb4c19e7a9bdbcba1788362987495	10 KB	—	✓	3rd

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

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

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

Page Weight Budget

746 KB transferred, 37 requests

PASS

746 KB transferred, 37 requests

Page weighs 1.3 MB (746 KB transferred)

37 HTTP requests

Estimated 0.15 g CO2 per page load

746 KB transferred

37 requests

0.15 g CO2 per page load

Images 305.4 KiB 41%

JavaScript 187.4 KiB 25%

Other 103.7 KiB 14%

Other 69.1 KiB 9%

Fonts 52.4 KiB 7%

HTML 15.9 KiB 2%

CSS 11.4 KiB 2%

Other 465 B 0%

0 2.4 MB 4.9 MB

Under budget

Third-Party Impact

24% third-party, 0 ms blocking

PASS

24% third-party, 0 ms blocking

Third-party code accounts for 24% of page weight (181.7 KiB of 745.7 KiB)

Third-party blocking time is low (0 ms)

76%

24%

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

14 images, 0 KB saveable

PASS

14 images, 0 KB saveable

All images are well-optimized

14 images 305 KB

0 oversized -0 KB

0 legacy format

0 missing dimensions CLS risk

A+

Font Loading

2 fonts (52 KB)

PASS

2 fonts (52 KB)

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

Web fonts

52 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

502b9851e13aed9b.woff2 woff2 swap

Size 29 KB

Load time 50 ms

Start 98 ms

Risk FOUT — text flashes from fallback to web font

181a29443484632f.woff2 woff2 swap

Size 23 KB

Load time 19 ms

Start 202 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+

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=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.

A+

Page Weight Inventory

37 resources · 746 KB · 73 KB savings available

PASS

37 resources · 746 KB · 73 KB savings available

Within 1MB page-weight target

Got: 746 KB

~73 KB of savings available

3 third-party resources (24% of weight)

37 resources · 745.7 KiB · 3 third-party Within 1MB page-weight target

Image 42% · 314.3 KiB

JavaScript 25% · 187.4 KiB

Document 15% · 110.7 KiB

Other 9% · 69.5 KiB

Font 7% · 52.4 KiB

CSS 2% · 11.4 KiB

~73.0 KiB of savings available

Remove unused JavaScript: 73.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

37 resources			745.7 KiB

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

37 requests over 8273ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

28% of JavaScript execution is third-party

First-party Third-party 145ms · 171KB · €2/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Google Tag Manager www.googletagmanager.com	Tag Manager	145ms	171 KB	43%	€2/mo	Optional

Google Tag Manager

Tag Manager

Optional

Execution 145ms

Transfer 171 KB

Unused 43%

Monthly Cost €2/mo

How third-party costs are calculated

Image Optimization

13 images, 214 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

214 KB

4 missing lazy loading

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