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.

281 ms

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

1.29 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.

0.286

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

1.25 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.

1.29 s

Page Load Progression

429 ms

858 ms

1.3 s

1.7 s

2.1 s

2.6 s

3.0 s

3.4 s

Checks

12 PASS 6 REVIEW 1 FIX

Page Weight Budget

Action

3.2 MB transferred, 28 requests

FIX

3.2 MB transferred, 28 requests

Page weighs 3.6 MB (3.2 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

28 HTTP requests

Estimated 0.67 g CO2 per page load

3.2 MB transferred

28 requests

0.67 g CO2 per page load

Images 2.3 MiB 73%

Other 699.9 KiB 22%

Fonts 99.2 KiB 3%

Other 44.9 KiB 1%

HTML 40.1 KiB 1%

JavaScript 3.2 KiB 0%

CSS 1.4 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

JS Execution Cost

Action

1125ms total JS execution

REVIEW

1125ms total JS execution

https://herbosalud.com/: 991ms CPU time

Unattributable: 134ms CPU time

Main Thread Breakdown

Style & Layout 49% Other 33% Rendering 8% Script Evaluation 6% Parse HTML & CSS 4%

Script	Total	Scripting	Parse/Compile	Party
https://herbosalud.com/	991ms	49ms	5ms	1st
Unattributable	134ms	4ms	0ms	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.

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

Action

28 resources · 3.2 MB · 0 KB savings available

REVIEW

28 resources · 3.2 MB · 0 KB savings available

Page weight 3.2 MB exceeds 1 MB target by 2.2 MB

Got: 3.2 MB Expected: ≤ 1 MB

9 third-party resources (25% of weight)

3 resources over 200KB

28 resources · 3.2 MiB · 9 third-party 2.2 MiB over 1MB target

Image 74% · 2.4 MiB

Media 22% · 699.9 KiB

Font 3% · 99.2 KiB

Document 1% · 40.1 KiB

JavaScript 0% · 3.2 KiB

CSS 0% · 1.4 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

28 resources			3.2 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

ETag present — enables conditional (304) responses

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

Third-Party Impact

25% third-party, 0 ms blocking

PASS

25% third-party, 0 ms blocking

Third-party code accounts for 25% of page weight (800.5 KiB of 3.2 MiB)

Third-party blocking time is low (0 ms)

75%

25%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

Image Optimization

14 images, 0 KB saveable

PASS

14 images, 0 KB saveable

All images are well-optimized

14 images 2.3 MB

0 oversized -0 KB

3 legacy format

0 missing dimensions CLS risk

A+

Font Loading

5 fonts (99 KB)

PASS

5 fonts (99 KB)

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

Web fonts

99 KB total

Render-blocking

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

co3bmX5slCNuHLi8bLeY9MK... woff2 swap

Size 37 KB

Load time 25 ms

Start 1.0 s