Performance

· 22 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

100

Accessibility

100

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.

825 ms

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

1.23 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.

825 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.

1.23 s

Page Load Progression

379 ms

757 ms

1.1 s

1.5 s

1.9 s

2.3 s

2.6 s

3.0 s

Checks

15 PASS 4 REVIEW

JS Execution Cost

661ms total JS execution

REVIEW

661ms total JS execution

https://juvel.pages.dev/: 586ms CPU time

Unattributable: 75ms CPU time

Main Thread Breakdown

Other 39% Style & Layout 26% Script Evaluation 23% Rendering 5% Script Parsing & Compilation 3% Parse HTML & CSS 3%

Script	Total	Scripting	Parse/Compile	Party
https://juvel.pages.dev/	586ms	151ms	22ms	1st
Unattributable	75ms	3ms	0ms	1st

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

A+

Page Weight Budget

500 KB transferred, 15 requests

PASS

500 KB transferred, 15 requests

Page weighs 1.2 MB (500 KB transferred)

15 HTTP requests

Estimated 0.10 g CO2 per page load

500 KB transferred

15 requests

0.10 g CO2 per page load

HTML 248.6 KiB 50%

Images 184.5 KiB 37%

Fonts 59.9 KiB 12%

Other 5.4 KiB 1%

CSS 1.2 KiB 0%

Other 433 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

13% third-party, 0 ms blocking

PASS

13% third-party, 0 ms blocking

Third-party code accounts for 13% of page weight (66.5 KiB of 500.0 KiB)

Third-party blocking time is low (0 ms)

87%

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+

Image Optimization

2 images, 0 KB saveable

PASS

2 images, 0 KB saveable

All images are well-optimized

2 images 185 KB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

Font Loading

6 fonts (60 KB)

PASS

6 fonts (60 KB)

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

Web fonts

60 KB total

Render-blocking

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

Iurf6YBj_oCad4k1l7KmHrR... woff2 swap

Size 9 KB

Load time 26 ms

Start 325 ms