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

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.

376 ms

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

416 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.

0.000

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

1.64 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.

416 ms

Page Load Progression

483 ms

966 ms

1.4 s

1.9 s

2.4 s

2.9 s

3.4 s

3.9 s

Checks

11 PASS 8 REVIEW

Page Weight Budget

1.3 MB transferred, 26 requests

REVIEW

1.3 MB transferred, 26 requests

Page weighs 1.3 MB (1.3 MB transferred)

Fonts are 307 KB — consider subsetting or using system fonts

Subset fonts to include only used characters, or switch to system font stacks.

Got: 307 KB

26 HTTP requests

Estimated 0.26 g CO2 per page load

1.3 MB transferred

26 requests

0.26 g CO2 per page load

Images 786.7 KiB 61%

Fonts 307.3 KiB 24%

JavaScript 118.5 KiB 9%

CSS 41.7 KiB 3%

Other 15.2 KiB 1%

HTML 9.5 KiB 1%

Other 1.5 KiB 0%

Other 743 B 0%

0 2.4 MB 4.9 MB

Under budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Image Optimization

10 images, 0 KB saveable

REVIEW

10 images, 0 KB saveable

All images are well-optimized

10 images 787 KB

0 oversized -0 KB

10 legacy format

0 missing dimensions CLS risk

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.

Compression Algorithm

Main response uses gzip; brotli would be ~20% smaller

REVIEW

Main response uses gzip; brotli would be ~20% smaller

Main HTML response uses gzip (brotli would be ~20% smaller)

All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.

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.

Page Weight Inventory

26 resources · 1.3 MB · 28 KB savings available

REVIEW

26 resources · 1.3 MB · 28 KB savings available

Page weight 1.3 MB exceeds 1 MB target by 257 KB

Got: 1.3 MB Expected: ≤ 1 MB

26 resources · 1.3 MiB · 0 third-party 257.2 KiB over 1MB target

Image 63% · 801.9 KiB

Font 24% · 307.3 KiB

JavaScript 9% · 118.5 KiB

CSS 3% · 41.7 KiB

Document 1% · 9.5 KiB

Other 0% · 2.2 KiB

~28.4 KiB of savings available

Remove unused JavaScript: 28.4 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

26 resources			1.3 MiB

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

A+

Third-Party Impact

No third-party resources

PASS

No third-party resources

No third-party resources detected

No third-party resources detected — all resources are first-party.

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

170ms total JS execution

PASS

170ms total JS execution

https://new.osteriadelpane.com/: 96ms CPU time

Unattributable: 74ms CPU time

Main Thread Breakdown

Other 52% Style & Layout 26% Script Evaluation 9% Rendering 9%

Script	Total	Scripting	Parse/Compile	Party
https://new.osteriadelpane.com/	96ms	2ms	0ms	1st
Unattributable	74ms	1ms	0ms	1st

A+

Font Loading

3 fonts (307 KB)

PASS

3 fonts (307 KB)

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

Web fonts

307 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

Inter-ExtraBold.woff2 woff2 swap

Size 105 KB

Load time 899 ms

Start 436 ms

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

Inter-Regular.woff2 woff2 swap

Size 97 KB

Load time 707 ms

Start 436 ms

Risk FOUT — text flashes from fallback to web font

Inter-SemiBold.woff2 woff2 swap

Size 105 KB

Load time 942 ms

Start 437 ms

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

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)

Fixing the unchecked items could save ~105 KB and ~210 ms

A+

JS Bundles

5 scripts, 28 KB unused

PASS

5 scripts, 28 KB unused

https://new.osteriadelpane.com/js/site/45: 28 KB unused (63%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 28 KB

28 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://new.osteriadelpane.com/js/site/45	45 KB	28 KB (63%)	✓	1st
https://new.osteriadelpane.com/js/polyfill.min.js	4 KB	—	✓	1st
https://new.osteriadelpane.com/js/icons-data/45	44 KB	—	✓	1st
https://new.osteriadelpane.com/js/icons/45	2 KB	—	✓	1st
https://new.osteriadelpane.com/js/shared/45	23 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+

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: gzip` 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.

Network Waterfall

26 requests over 1609ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

2 images, 33 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

33 KB

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