Performance

· 27 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.

1.97 s

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

2.57 s

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

14 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.

2.71 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.

2.57 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

15 PASS 7 REVIEW 2 FIX

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (163.9 KiB of 164.0 KiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

HTTP Caching

Action

No cache headers

FIX

No cache headers

No Cache-Control header found

Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

Image Optimization

18 images, 0 KB saveable

REVIEW

18 images, 0 KB saveable

https://www.psicocitta.it/consenso/skype.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

18 images 48 KB

0 oversized -0 KB

18 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

JS Bundles

2 scripts, 64 KB unused

REVIEW

2 scripts, 64 KB unused

https://www.psicocitta.it/psicologia-benessere/scr...: 41 KB unused (72%)

Consider code splitting or tree shaking to reduce unused code.

https://www.psicocitta.it/psicologia-benessere/scr...: 23 KB unused (89%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 64 KB

64 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.psicocitta.it/psicologia-benessere/scripts.lib.js	56 KB	41 KB (72%)	✓	3rd
https://www.psicocitta.it/psicologia-benessere/scripts.11a.js	26 KB	23 KB (89%)	✓	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

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

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.

Document Compression

Action

Document response served uncompressed

REVIEW

Document response served uncompressed

Main HTML response has no Content-Encoding (uncompressed)

The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.

Main HTML Cache-Control

No Cache-Control header on main HTML response

REVIEW

No Cache-Control header on main HTML response

Main HTML response has no Cache-Control header

Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.

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

A+

Page Weight Budget

164 KB transferred, 26 requests

PASS

164 KB transferred, 26 requests

Page weighs 521 KB (164 KB transferred)

26 HTTP requests

Estimated 0.03 g CO2 per page load

164 KB transferred

26 requests

0.03 g CO2 per page load

JavaScript 82.1 KiB 50%

Images 48.2 KiB 29%

CSS 22.9 KiB 14%

HTML 8.6 KiB 5%

Other 1.8 KiB 1%

Other 443 B 0%

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+

JS Execution Cost

419ms total JS execution

PASS

419ms total JS execution

https://www.psicocitta.it/: 160ms CPU time

Unattributable: 155ms CPU time

https://www.psicocitta.it/psicologia-benessere/scr...: 105ms CPU time

Third-party scripts: 265ms (63% of total)

Main Thread Breakdown

Other 40% Style & Layout 25% Script Evaluation 20% Script Parsing & Compilation 6% Parse HTML & CSS 6% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
https://www.psicocitta.it/	160ms	4ms	1ms	3rd
Unattributable	155ms	6ms	0ms	1st
https://www.psicocitta.it/psicologia-benessere/scripts.lib.js	105ms	72ms	16ms	3rd

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+

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+

Asset Compression

All 1 asset host use brotli

PASS

All 1 asset host use brotli

www.psicocitta.it serves assets with brotli (assets: 17)

Got: www.psicocitta.it (text/css)

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+

Server Response Intelligence

1 server-response signal(s) detected

PASS

1 server-response signal(s) detected

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

26 resources · 164 KB · 64 KB savings available

PASS

26 resources · 164 KB · 64 KB savings available

Within 1MB page-weight target

Got: 164 KB

~64 KB of savings available

25 third-party resources (100% of weight)

26 resources · 164.0 KiB · 25 third-party Within 1MB page-weight target

JavaScript 50% · 82.1 KiB

Image 30% · 49.8 KiB

CSS 14% · 22.9 KiB

Document 6% · 9.2 KiB

~63.6 KiB of savings available

Remove unused JavaScript: 63.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

26 resources			164.0 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

JavaScript Blocking

1 JS blocking issue(s) detected

PASS

1 JS blocking issue(s) detected

2 render-blocking <script src> tag(s) without async/defer

Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

Network Waterfall

26 requests over 519ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

63% of JavaScript execution is third-party

First-party Third-party 265ms · 65KB · €3/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.psicocitta.it www.psicocitta.it	Other	160ms	9 KB	—	€2/mo	Optional
www.psicocitta.it www.psicocitta.it	Other	105ms	56 KB	72%	€1/mo	Optional

www.psicocitta.it

Other

Optional

Execution 160ms

Transfer 9 KB

Monthly Cost €2/mo

www.psicocitta.it

Other

Optional

Execution 105ms

Transfer 56 KB

Unused 72%

Monthly Cost €1/mo

63% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

72% of www.psicocitta.it's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

Image Optimization

10 images, 25 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

25 KB

8 missing alt text 2 missing dimensions 7 missing lazy loading

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