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https://manuelferrara.com

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
5
PASS
12
INFO
3

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
88
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
83
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

643 ms

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

2.28 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.

943 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.28 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
22
12 PASS 5 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.0 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
5 resources · 2.0 MB · 0 KB savings available
FIX
5 resources · 2.0 MB · 0 KB savings available
Warning::
Page weight 2.0 MB exceeds 1 MB target by 1.0 MB
Got: 2.0 MB Expected: ≤ 1 MB
Warning::
4 third-party resources (100% of weight)
Info::
1 resources over 200KB
5 resources · 2.0 MiB · 4 third-party 1.0 MiB over 1MB target
Image 100% · 2.0 MiB
Document 0% · 2.1 KiB
CSS 0% · 279 B
Other 0% · 247 B
C
Page Weight Budget
Action
2.0 MB transferred, 5 requests
REVIEW
2.0 MB transferred, 5 requests
Info::
Page weighs 2.0 MB (2.0 MB transferred)
Warning::
Images are 2.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.0 MB
Info::
5 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
5 requests
0.42 g CO2 per page load
Images 2.0 MiB 100%
HTML 2.1 KiB 0%
Other 1.5 KiB 0%
CSS 279 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
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.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A
Image Optimization
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Warning::
https://www.manuelferrara.com/trial_pg/pg_mf_heade... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
1 images 2.0 MB
0 oversized -0 KB
1 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

A+
JS Execution Cost
68ms total JS execution
PASS
68ms total JS execution
Info::
Unattributable: 68ms CPU time

Main Thread Breakdown

Other 80% Style & Layout 11% Script Evaluation 5%
ScriptTotalScriptingParse/CompileParty
Unattributable68ms2ms0ms1st
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
No JavaScript
PASS
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
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+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML uses no-cache -- safe revalidate-on-request policy
PASS
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: no-cache
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
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
5 requests over 1451ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 643 ms LCP 2.3 shttps://manuelferrara.com// https://manuelferrara.com/ — 302 — 247 B — 77 ms — h2https://www.manuelferrara.com/trial_pg/www.manuelferrara.com/trial_pg/ https://www.manuelferrara.com/trial_pg/ — 200 — 2.1 KiB — 140 ms — h2https://www.manuelferrara.com/trial_pg/styles.csswww.manuelferrara.com/trial_pg/styl... https://www.manuelferrara.com/trial_pg/styles.css — 404 — 279 B — 141 ms — h2https://www.manuelferrara.com/trial_pg/pg_mf_header.jpgwww.manuelferrara.com/trial_pg/pg_m... https://www.manuelferrara.com/trial_pg/pg_mf_header.jpg — 200 — 2.0 MiB — 1.1 s — h2https://www.manuelferrara.com/favicon.icowww.manuelferrara.com/favicon.ico https://www.manuelferrara.com/favicon.ico — 200 — 1.3 KiB — 139 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-06-14 — 2026-07-11)

LCP (p75)

2970 ms

67% good

INP (p75)

64 ms

98% good

CLS (p75)

0.000

100% good

FCP (p75)

1718 ms

TTFB (p75)

1136 ms

Image Optimization
1 images, 2055 KB total, 1855 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

2055 KB

Oversized

1

Wasted

1855 KB

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

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