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.

1.87 s

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

3.15 s

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

279 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.123

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

3.06 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.

3.16 s

Page Load Progression

931 ms

1.9 s

2.8 s

3.7 s

4.7 s

5.6 s

6.5 s

7.4 s

Checks

5 PASS 3 REVIEW 5 FIX

Page Weight Budget

Action

9.8 MB transferred, 89 requests

FIX

9.8 MB transferred, 89 requests

Page weighs 13.0 MB (9.8 MB transferred)

Fonts are 397 KB — consider subsetting or using system fonts

Subset fonts to include only used characters, or switch to system font stacks.

Got: 397 KB

89 HTTP requests

Estimated 2.1 g CO2 per page load

9.8 MB transferred

89 requests

2.1 g CO2 per page load

Other 7.9 MiB 81%

Images 481.7 KiB 5%

Fonts 396.9 KiB 4%

Other 387.4 KiB 4%

JavaScript 362.1 KiB 4%

HTML 240.9 KiB 2%

CSS 80.6 KiB 1%

Other 417 B 0%

Other 327 B 0%

Other 299 B 0%

0 2.4 MB 4.9 MB

Over budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (9.8 MiB of 9.8 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

2158ms total JS execution

FIX

2158ms total JS execution

https://agngnconpm.cloudimg.io/v7/https://dgaddcos...: 807ms CPU time

https://cdn.mouseflow.com/projects/65b8ae16-3be0-4...: 468ms CPU time

Unattributable: 420ms CPU time

https://www.michelin.com/: 391ms CPU time

https://sdk.privacy-center.org/sdk/22ecd6bfac93de6...: 72ms CPU time

Third-party scripts: 2158ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 26% Style & Layout 10%

Script	Total	Scripting	Parse/Compile	Party
https://agngnconpm.cloudimg.io/v7/https://dgaddcosprod.blob.core.windows.net/cxf-corporate/astro/v2.18.0/_astro/runtime.M_XNRUEv.js	807ms	742ms	0ms	3rd
https://cdn.mouseflow.com/projects/65b8ae16-3be0-4492-9253-16bb4ccc8184.js	468ms	367ms	6ms	3rd
Unattributable	420ms	19ms	0ms	3rd
https://www.michelin.com/	391ms	26ms	2ms	3rd
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js	72ms	58ms	14ms	3rd

Page Weight Inventory

Action

89 resources · 9.8 MB · 75 KB savings available

FIX

89 resources · 9.8 MB · 75 KB savings available

Page weight 8.8 MB over 1MB target

Got: 9.8 MB Expected: ≤ 1 MB

~75 KB of savings available

88 third-party resources (100% of weight)

4 resources over 200KB

89 resources · 9.8 MiB · 88 third-party 8.8 MiB over 1MB target

Media 81% · 7.9 MiB

Image 9% · 868.9 KiB

Font 4% · 396.9 KiB

JavaScript 4% · 362.1 KiB

Document 2% · 240.9 KiB

CSS 1% · 80.6 KiB

Other 0% · 1.2 KiB

~74.9 KiB of savings available

Remove unused JavaScript: 74.9 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

89 resources			9.8 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.

Image Optimization

8 images, 0 KB saveable

REVIEW

8 images, 0 KB saveable

https://agngnconpm.cloudimg.io/v7/https://dgaddcos... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

8 images 482 KB

0 oversized -0 KB

3 legacy format

2 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

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

JS Bundles

60 scripts, 75 KB unused

REVIEW

60 scripts, 75 KB unused

https://sdk.privacy-center.org/sdk/22ecd6bfac93de6...: 54 KB unused (53%)

Consider code splitting or tree shaking to reduce unused code.

https://cdn.mouseflow.com/projects/65b8ae16-3be0-4...: 21 KB unused (41%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 75 KB

75 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://sdk.privacy-center.org/sdk/22ecd6bfac93de604efec0b75b2c796ee1675f92/modern/sdk.22ecd6bfac93de604efec0b75b2c796ee1675f92.js	101 KB	54 KB (53%)	✓	3rd
https://cdn.mouseflow.com/projects/65b8ae16-3be0-4492-9253-16bb4ccc8184.js	53 KB	21 KB (41%)	✓	3rd
https://agngnconpm.cloudimg.io/v7/https://dgaddcosprod.blob.core.windows.net/cxf-corporate/astro/v2.18.0/_astro/ClientRouter.astro_astro_type_script_index_0_lang.DZnDNxNb.js	6 KB	—	✓	3rd
https://agngnconpm.cloudimg.io/v7/https://dgaddcosprod.blob.core.windows.net/cxf-corporate/astro/v2.18.0/_astro/PianoAnalytics.BLMC10ki.js	2 KB	—	✓	3rd
https://agngnconpm.cloudimg.io/v7/https://dgaddcosprod.blob.core.windows.net/cxf-corporate/astro/v2.18.0/_astro/client.svelte.DGfBtKQc.js	1 KB	—	✓	3rd
https://agngnconpm.cloudimg.io/v7/https://dgaddcosprod.blob.core.windows.net/cxf-corporate/astro/v2.18.0/_astro/legacy.QxIWGC4C.js	0 KB	—	✓	3rd
https://agngnconpm.cloudimg.io/v7/https://dgaddcosprod.blob.core.windows.net/cxf-corporate/astro/v2.18.0/_astro/index-client.CNwuEL72.js	0 KB	—	✓	3rd
https://agngnconpm.cloudimg.io/v7/https://dgaddcosprod.blob.core.windows.net/cxf-corporate/astro/v2.18.0/_astro/runtime.M_XNRUEv.js	9 KB	—	✓	3rd
https://agngnconpm.cloudimg.io/v7/https://dgaddcosprod.blob.core.windows.net/cxf-corporate/astro/v2.18.0/_astro/lifecycle.C9HdC8AO.js	0 KB	—	✓	3rd
https://agngnconpm.cloudimg.io/v7/https://dgaddcosprod.blob.core.windows.net/cxf-corporate/astro/v2.18.0/_astro/props.CuL19VXw.js	2 KB	—	✓	3rd

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

4 fonts (397 KB)

PASS

4 fonts (397 KB)

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

Web fonts

397 KB total

Render-blocking

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

NotoSans-Bold.woff2 woff2 swap

Size 160 KB

Load time 369 ms

Start 1.4 s

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

NotoSans.woff2 woff2 swap

Size 161 KB

Load time 322 ms

Start 1.4 s

Risk FOUT — text flashes from fallback to web font

Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need

MichelinUnitTitling-Bol... woff2 swap

Size 39 KB

Load time 224 ms

Start 1.4 s

Risk FOUT — text flashes from fallback to web font

MichelinUnitTitling-Reg... woff2 swap

Size 38 KB

Load time 223 ms

Start 1.4 s

Risk FOUT — text flashes from fallback to web font

Optimization checklist

Preload critical fonts (priority=high)
Use woff2 format for all fonts
Set font-display to swap, optional, or fallback
Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~160 KB and ~320 ms

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

Network Waterfall

89 requests over 6669ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

100% of JavaScript execution is third-party

First-party Third-party 2158ms · 403KB · €23/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
agngnconpm.cloudimg.io agngnconpm.cloudimg.io	Other	807ms	9 KB	—	€9/mo	Costly
cdn.mouseflow.com cdn.mouseflow.com	Other	468ms	53 KB	41%	€5/mo	Costly
Unattributable Unattributable	Other	420ms	0 KB	—	€5/mo	Costly
www.michelin.com www.michelin.com	Other	391ms	241 KB	—	€4/mo	Costly
sdk.privacy-center.org sdk.privacy-center.org	Other	72ms	101 KB	53%	€1/mo	Optional

agngnconpm.cloudimg.io

Other

Costly

Execution 807ms

Transfer 9 KB

Monthly Cost €9/mo

cdn.mouseflow.com

Other

Costly

Execution 468ms

Transfer 53 KB

Unused 41%

Monthly Cost €5/mo

Unattributable

Other

Costly

Execution 420ms

Transfer 0 KB

Monthly Cost €5/mo

www.michelin.com

Other

Costly

Execution 391ms

Transfer 241 KB

Monthly Cost €4/mo

sdk.privacy-center.org

Other

Optional

Execution 72ms

Transfer 101 KB

Unused 53%

Monthly Cost €1/mo

These scripts may cost more than they're worth

agngnconpm.cloudimg.io adds 807ms and costs ~€9/month
cdn.mouseflow.com adds 468ms and costs ~€5/month
Unattributable adds 420ms and costs ~€5/month
www.michelin.com adds 391ms and costs ~€4/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

agngnconpm.cloudimg.io takes 807ms 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

cdn.mouseflow.com takes 468ms 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 420ms 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

www.michelin.com takes 391ms 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

53% of sdk.privacy-center.org's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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.