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

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.

1.51 s

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

2.26 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.

0.002

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

1.51 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.

2.26 s

Page Load Progression

399 ms

799 ms

1.2 s

1.6 s

2.0 s

2.4 s

2.8 s

3.2 s

Checks

10 PASS 6 REVIEW 4 FIX

Page Weight Budget

Action

2.9 MB transferred, 46 requests

FIX

2.9 MB transferred, 46 requests

Page weighs 4.4 MB (2.9 MB transferred)

Images are 2.3 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 2.3 MB

Fonts are 328 KB — consider subsetting or using system fonts

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

Got: 328 KB

46 HTTP requests

Estimated 0.61 g CO2 per page load

2.9 MB transferred

46 requests

0.61 g CO2 per page load

Images 2.3 MiB 81%

Fonts 328.3 KiB 11%

CSS 176.3 KiB 6%

JavaScript 29.4 KiB 1%

HTML 25.0 KiB 1%

Other 9.6 KiB 0%

0 2.4 MB 4.9 MB

Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

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 (2.9 MiB of 2.9 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

Page Weight Inventory

Action

46 resources · 2.9 MB · 22 KB savings available

FIX

46 resources · 2.9 MB · 22 KB savings available

Page weight 2.9 MB exceeds 1 MB target by 1.9 MB

Got: 2.9 MB Expected: ≤ 1 MB

45 third-party resources (100% of weight)

4 resources over 200KB

46 resources · 2.9 MiB · 45 third-party 1.9 MiB over 1MB target

Image 81% · 2.3 MiB

Font 11% · 328.3 KiB

CSS 6% · 176.3 KiB

Document 1% · 32.5 KiB

JavaScript 1% · 29.4 KiB

~22.0 KiB of savings available

Remove unused JavaScript: 22.0 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

46 resources			2.9 MiB

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

Action

17 images, 0 KB saveable

REVIEW

17 images, 0 KB saveable

https://sp-ao.shortpixel.ai/client/to_auto,q_gloss... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://sp-ao.shortpixel.ai/client/to_auto,q_gloss... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

17 images 2.3 MB

0 oversized -0 KB

15 legacy format

2 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

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

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.

Asset Compression

Action

1 of 2 asset hosts serve text uncompressed

REVIEW

1 of 2 asset hosts serve text uncompressed

www.romewebagency.it serves assets with gzip; brotli would be ~20% smaller (assets: 17)

Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.

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

fonts.googleapis.com serves text assets uncompressed (assets: 4)

The sampled response carries a text content type but no Content-Encoding, so the bytes go over the wire raw. Text compression typically removes 70-80% of a JS or CSS payload -- this is the single cheapest transfer win available on this host.

Got: fonts.googleapis.com (text/css)

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+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

319ms total JS execution

PASS

319ms total JS execution

https://www.romewebagency.it/: 259ms CPU time

Unattributable: 61ms CPU time

Third-party scripts: 259ms (81% of total)

Main Thread Breakdown

Other 44% Style & Layout 33% Parse HTML & CSS 10% Script Evaluation 6% Rendering 5%

Script	Total	Scripting	Parse/Compile	Party
https://www.romewebagency.it/	259ms	10ms	3ms	3rd
Unattributable	61ms	2ms	0ms	1st

A+

Font Loading

9 fonts (328 KB)

PASS

9 fonts (328 KB)

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

Web fonts

328 KB total

Render-blocking

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

thegem-icons.woff woff swap

Size 12 KB

Load time 55 ms

Start 634 ms