Performance

· 25 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.

1.83 s

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

1.98 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.

4.74 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.

1.98 s

Page Load Progression

522 ms

1.0 s

1.6 s

2.1 s

2.6 s

3.1 s

3.7 s

4.2 s

Checks

16 PASS 7 REVIEW

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

JS Execution Cost

616ms total JS execution

REVIEW

616ms total JS execution

https://new.osteriadelpane.com/: 318ms CPU time

Unattributable: 235ms CPU time

https://new.osteriadelpane.com/js/site/45: 63ms CPU time

Main Thread Breakdown

Other 49% Style & Layout 25% Script Evaluation 11% Rendering 10%

Script	Total	Scripting	Parse/Compile	Party
https://new.osteriadelpane.com/	318ms	6ms	2ms	1st
Unattributable	235ms	6ms	0ms	1st
https://new.osteriadelpane.com/js/site/45	63ms	27ms	5ms	1st

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.

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

1021 KB transferred, 24 requests

PASS

1021 KB transferred, 24 requests

Page weighs 1.0 MB (1021 KB transferred)

24 HTTP requests

Estimated 0.21 g CO2 per page load

1021 KB transferred

24 requests

0.21 g CO2 per page load

Images 786.7 KiB 77%

JavaScript 119.0 KiB 12%

Fonts 47.3 KiB 5%

CSS 40.5 KiB 4%

Other 15.2 KiB 1%

HTML 9.6 KiB 1%

Other 1.5 KiB 0%

Other 795 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

5% third-party, 0 ms blocking

PASS

5% third-party, 0 ms blocking

Third-party code accounts for 5% of page weight (48.7 KiB of 1020.7 KiB)

Third-party blocking time is low (0 ms)

95%

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+

Font Loading

1 fonts (47 KB)

PASS

1 fonts (47 KB)

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

Web fonts

47 KB total

Render-blocking

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

UcC73FwrK3iLTeHuS_nVMrM... woff2 swap

Size 47 KB

Load time 34 ms

Start 538 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

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	45 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

2 hints, 0 missing preconnects

PASS

2 hints, 0 missing preconnects

Page uses 2 resource hint(s)

Current Resource Hints

preconnect

preload

—

dns-prefetch

—

prefetch

—

2 resource hints configured

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.

A+

Page Weight Inventory

24 resources · 1021 KB · 28 KB savings available

PASS

24 resources · 1021 KB · 28 KB savings available

Within 1MB page-weight target

Got: 1021 KB

2 third-party resources (5% of weight)

24 resources · 1020.7 KiB · 2 third-party Within 1MB page-weight target

Image 79% · 801.9 KiB

JavaScript 12% · 119.0 KiB

Font 5% · 47.3 KiB

CSS 4% · 40.5 KiB

Document 1% · 9.6 KiB

Other 0% · 2.3 KiB

~28.4 KiB of savings available

Remove unused JavaScript: 28.4 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

24 resources			1020.7 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

A+

JavaScript Blocking

No render-blocking JS or document.write usage detected

PASS

No render-blocking JS or document.write usage detected

No JavaScript blocking issues detected

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

Network Waterfall

24 requests over 1865ms

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.