Performance

· 14 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

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.

1.74 s

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

1.74 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.

2.05 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.

1.74 s

Page Load Progression

667 ms

1.3 s

2.0 s

2.7 s

3.3 s

4.0 s

4.7 s

5.3 s

Checks

10 PASS 1 REVIEW 1 FIX

HTTP Caching

Action

no-store (uncacheable)

FIX

no-store (uncacheable)

Cache-Control: no-store prevents all caching

Intentional for dynamic content, but increases server load for every page view.

Got: private, no-cache, no-store, max-age=0, must-revalidate

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

private, no-cache, no-store, max-age=0, must-revalidate

Directive	Value	Meaning
private	—	Only browser cache, not CDN/proxy
no-cache	—	Cache but always revalidate first
no-store	—	Never cache this response
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

JS Execution Cost

Action

1044ms total JS execution

REVIEW

1044ms total JS execution

https://matheo-olsen.fr/_next/static/chunks/8f02d1...: 370ms CPU time

https://matheo-olsen.fr/_next/static/chunks/5cf263...: 278ms CPU time

https://matheo-olsen.fr/: 256ms CPU time

Unattributable: 140ms CPU time

Third-party scripts: 140ms (13% of total)

Main Thread Breakdown

Other 38% Script Evaluation 29% Style & Layout 21% Rendering 7% Script Parsing & Compilation 4%

Script	Total	Scripting	Parse/Compile	Party
https://matheo-olsen.fr/_next/static/chunks/8f02d17ed0289fd9.js	370ms	212ms	7ms	1st
https://matheo-olsen.fr/_next/static/chunks/5cf263598dde299a.js	278ms	48ms	5ms	1st
https://matheo-olsen.fr/	256ms	6ms	11ms	1st
Unattributable	140ms	8ms	0ms	3rd

A+

Page Weight Budget

610 KB transferred, 46 requests

PASS

610 KB transferred, 46 requests

Page weighs 1.5 MB (610 KB transferred)

46 HTTP requests

Estimated 0.12 g CO2 per page load

610 KB transferred

46 requests

0.12 g CO2 per page load

JavaScript 236.0 KiB 39%

Fonts 190.4 KiB 31%

Images 71.6 KiB 12%

HTML 65.9 KiB 11%

CSS 18.9 KiB 3%

Other 15.2 KiB 2%

Other 12.0 KiB 2%

Other 0 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

0% third-party, 0 ms blocking

PASS

0% third-party, 0 ms blocking

Third-party code accounts for 0% of page weight (2.5 KiB of 610.0 KiB)

Third-party blocking time is low (0 ms)

100%

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

6 images, 0 KB saveable

PASS

6 images, 0 KB saveable

All images are well-optimized

6 images 72 KB

0 oversized -0 KB

0 legacy format

0 missing dimensions CLS risk

A+

Font Loading

6 fonts (190 KB)

PASS

6 fonts (190 KB)

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

Web fonts

190 KB total

Render-blocking

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

70bc3e132a0a741e-s.p.15... woff2 swap

Size 40 KB

Load time 0 ms

Start 0 ms