Performance

· 16 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

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.

4.01 s

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

8.21 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

697 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.

4.44 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.

9.04 s

Page Load Progression

567 ms

1.1 s

1.7 s

2.3 s

2.8 s

3.4 s

4.0 s

4.5 s

Checks

7 PASS 5 REVIEW 2 FIX

JS Execution Cost

Action

11898ms total JS execution

FIX

11898ms total JS execution

https://assets.adobedtm.com/05d433614f62/5f9178807...: 6023ms CPU time

https://www.fnac.com/: 1762ms CPU time

Unattributable: 1099ms CPU time

https://www.fnac.com/sETIirsTNhdVu-Dr3ngY/fi5VtSwk...: 1058ms CPU time

https://www.fnac.com/static-proxy/kameleoon/script...: 841ms CPU time

Third-party scripts: 7122ms (60% of total)

Main Thread Breakdown

Script Evaluation 52% Other 35% Style & Layout 6% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
https://assets.adobedtm.com/05d433614f62/5f9178807eef/launch-385ae949e4fb.min.js	6023ms	3644ms	40ms	3rd
https://www.fnac.com/	1762ms	37ms	2ms	1st
Unattributable	1099ms	48ms	0ms	3rd
https://www.fnac.com/sETIirsTNhdVu-Dr3ngY/fi5VtSwkVhQVpLDOr3/YnB5eA/AB8o/J29mE3oB	1058ms	957ms	71ms	1st
https://www.fnac.com/static-proxy/kameleoon/script.js	841ms	647ms	153ms	1st
https://www.fnac.com/Assets/dist/nav/_71d6e5ac0fff3191.js	756ms	556ms	1ms	1st
https://www.fnac.com/akam/13/4f24659	218ms	190ms	8ms	1st
https://www.fnac.com/Assets/dist/nav/_ea464ae792709644.js	81ms	14ms	9ms	1st
https://www.fnac.com/Assets/dist/nav/_50b1dec1d7c231ba.js	60ms	26ms	34ms	1st

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: max-age=0, no-cache, no-store

No ETag or Last-Modified header

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

Cache-Control

max-age=0, no-cache, no-store

Directive	Value	Meaning
max-age	0	Cache for 0 seconds
no-cache	—	Cache but always revalidate first
no-store	—	Never cache this response

Page Weight Budget

1.5 MB transferred, 118 requests

REVIEW

1.5 MB transferred, 118 requests

Page weighs 4.1 MB (1.5 MB transferred)

JavaScript is 708 KB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 708 KB

118 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.31 g CO2 per page load

1.5 MB transferred

118 requests

0.31 g CO2 per page load

JavaScript 708.0 KiB 46%

Images 450.6 KiB 30%

Other 215.2 KiB 14%

CSS 67.5 KiB 4%

Other 42.7 KiB 3%

HTML 36.3 KiB 2%

Other 2.8 KiB 0%

Other 1.1 KiB 0%

Other 374 B 0%

0 2.4 MB 4.9 MB

Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

Third-Party Impact

50% third-party, 0 ms blocking

REVIEW

50% third-party, 0 ms blocking

Third-party code accounts for 50% of page weight (762.4 KiB of 1.5 MiB)

Third-party blocking time is low (0 ms)

50%

First-party Third-party

Image Optimization

40 images, 0 KB saveable

REVIEW

40 images, 0 KB saveable

All images are well-optimized

40 images 451 KB

0 oversized -0 KB

34 legacy format

0 missing dimensions CLS risk

JS Bundles

19 scripts, 94 KB unused

REVIEW

19 scripts, 94 KB unused

https://www.fnac.com/Assets/dist/nav/_50b1dec1d7c2...: 60 KB unused (59%)

Consider code splitting or tree shaking to reduce unused code.

https://www.fnac.com/sETIirsTNhdVu-Dr3ngY/fi5VtSwk...: 34 KB unused (20%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 94 KB

94 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.fnac.com/Assets/dist/nav/_50b1dec1d7c231ba.js	102 KB	60 KB (59%)	✓	1st
https://www.fnac.com/sETIirsTNhdVu-Dr3ngY/fi5VtSwkVhQVpLDOr3/YnB5eA/AB8o/J29mE3oB	172 KB	34 KB (20%)	✓	1st
https://www.fnac.com/Assets/dist/nav/_b2821b72477bc347.js	3 KB	—	✓	1st
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js	0 KB	—	✓	3rd
https://www.fnac.com/Assets/dist/nav/_eb02a117f3962fc9.js	13 KB	—	✓	1st
https://www.fnac.com/Assets/dist/nav/_618cc8fabd8154e0.js	10 KB	—	✓	1st
https://www.fnac.com/Assets/dist/nav/_ea464ae792709644.js	27 KB	—	✓	1st
https://www.fnac.com/Assets/dist/nav/_ecea0a8b4fd1de10.js	19 KB	—	✓	1st
https://www.fnac.com/Assets/dist/nav/_61be67b13fb221d9.js	1 KB	—	✓	1st
https://www.fnac.com/Assets/dist/nav/_3089bf88f20bab1c.js	5 KB	—	✓	1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

118 requests over 0ms

INFO

Performance analysis not available for this result.

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

60% of JavaScript execution is third-party

First-party Third-party 7122ms · 81KB · €77/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
assets.adobedtm.com assets.adobedtm.com	Other	6023ms	81 KB	—	€65/mo	Costly
Unattributable Unattributable	Other	1099ms	0 KB	—	€12/mo	Costly

assets.adobedtm.com

Other

Costly

Execution 6023ms

Transfer 81 KB

Monthly Cost €65/mo

Unattributable

Other

Costly

Execution 1099ms

Transfer 0 KB

Monthly Cost €12/mo

These scripts may cost more than they're worth

assets.adobedtm.com adds 6023ms and costs ~€65/month
Unattributable adds 1099ms and costs ~€12/month

60% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

assets.adobedtm.com takes 6023ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 1099ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

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