Performance

· 15 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.

975 ms

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

2.75 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.

0.081

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

1.54 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.

2.82 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

7 PASS 3 REVIEW 3 FIX

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 (1.8 MiB of 1.8 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

Page Weight Inventory

Action

76 resources · 1.8 MB · 132 KB savings available

FIX

76 resources · 1.8 MB · 132 KB savings available

Page weight 865 KB over 1MB target

Got: 1.8 MB Expected: ≤ 1 MB

~132 KB of savings available

75 third-party resources (100% of weight)

76 resources · 1.8 MiB · 75 third-party 865.2 KiB over 1MB target

Image 66% · 1.2 MiB

JavaScript 24% · 460.4 KiB

Font 6% · 106.5 KiB

CSS 2% · 40.3 KiB

Document 1% · 26.0 KiB

Other 0% · 4.1 KiB

~132.4 KiB of savings available

Remove unused JavaScript: 132.4 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

76 resources			1.8 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.

Page Weight Budget

Action

1.8 MB transferred, 76 requests

REVIEW

1.8 MB transferred, 76 requests

Page weighs 3.2 MB (1.8 MB transferred)

Images are 1.2 MB — compress or use modern formats

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

Got: 1.2 MB

76 HTTP requests

Estimated 0.39 g CO2 per page load

1.8 MB transferred

76 requests

0.39 g CO2 per page load

Images 1.2 MiB 64%

JavaScript 460.4 KiB 24%

Fonts 106.5 KiB 6%

Other 49.1 KiB 3%

CSS 40.3 KiB 2%

HTML 26.0 KiB 1%

Other 2.0 KiB 0%

Other 1.5 KiB 0%

Other 0 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

Image Optimization

29 images, 0 KB saveable

REVIEW

29 images, 0 KB saveable

https://img.festival-cannes.com/eyJidWNrZXQiOiJtZW... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

29 images 1.2 MB

0 oversized -0 KB

7 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

JS Bundles

Action

22 scripts, 132 KB unused

REVIEW

22 scripts, 132 KB unused

https://affif.containers.piwik.pro/66e0bc7d-d182-4...: 40 KB unused (58%)