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https://www.colissimo.fr

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
31
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
71
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

12.72 s

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

15.06 s

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

1.24 s

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

0.011

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

12.72 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.

20.00 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
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 116 requests
FIX
2.9 MB transferred, 116 requests
Warning::
Page weighs 9.6 MB (2.9 MB transferred)
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Info::
Fonts are 242 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 242 KB
Warning::
116 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.62 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
116 requests
0.62 g CO2 per page load
JavaScript 2.1 MiB 73%
Images 319.7 KiB 11%
Fonts 241.7 KiB 8%
CSS 149.8 KiB 5%
HTML 60.0 KiB 2%
Other 19.2 KiB 1%
Other 10.4 KiB 0%
Other 6.9 KiB 0%
Other 858 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6252ms total JS execution
FIX
6252ms total JS execution
Warning::
https://www.laposte.fr/ecom/_nuxt/f17692a.modern.j...: 1663ms CPU time
Warning::
https://www.laposte.fr/colissimo: 1154ms CPU time
Warning::
Unattributable: 1114ms CPU time
Warning::
https://www.laposte.fr/ecom/_nuxt/c0a16e9.modern.j...: 848ms CPU time
Warning::
https://www.laposte.fr/ruxitagentjs_ICA7NVfhqrux_1...: 321ms CPU time
Warning::
Third-party scripts: 6252ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Other 21% Style & Layout 13% Script Parsing & Compilation 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.laposte.fr/ecom/_nuxt/f17692a.modern.js1663ms1472ms0ms3rd
https://www.laposte.fr/colissimo1154ms24ms40ms3rd
Unattributable1114ms89ms0ms3rd
https://www.laposte.fr/ecom/_nuxt/c0a16e9.modern.js848ms817ms2ms3rd
https://www.laposte.fr/ruxitagentjs_ICA7NVfhqrux_10333260303165926.js321ms255ms28ms3rd
https://try.abtasty.com/5714a31785e8fb2356ca3d1bd25e4a43/main.1e0116ad91cee0a97856.js209ms163ms38ms3rd
https://cdn.trustcommander.net/privacy/1491/privacy_v2_67.js166ms52ms25ms3rd
https://cdn.tagcommander.com/1491/tc_LaboutiqueLaPoste_21.js148ms106ms40ms3rd
https://cdn.tagcommander.com/1491/tc_LaboutiqueLaPoste_6.js136ms70ms25ms3rd
https://try.abtasty.com/shared/analytics.6c9b51bdfcbabb565f02.js112ms32ms3ms3rd

Showing top 10 of 15 scripts

F
JS Bundles
Action
53 scripts, 1.1 MB unused
FIX
53 scripts, 1.1 MB unused
Warning::
https://www.laposte.fr/ecom/_nuxt/e1f0dc9.modern.j...: 447 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.laposte.fr/ecom/_nuxt/ace3671.modern.j...: 147 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.laposte.fr/ecom/_nuxt/9aeea0a.modern.j...: 127 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.laposte.fr/ecom/_nuxt/c0a16e9.modern.j...: 86 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.laposte.fr/ecom/_nuxt/ca3c383.modern.j...: 56 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1165 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.laposte.fr/ecom/_nuxt/e1f0dc9.modern.js554 KB447 KB (81%)✓3rd
https://www.laposte.fr/ecom/_nuxt/ace3671.modern.js193 KB147 KB (76%)✓3rd
https://www.laposte.fr/ecom/_nuxt/9aeea0a.modern.js128 KB127 KB (100%)✓3rd
https://www.laposte.fr/ecom/_nuxt/c0a16e9.modern.js165 KB86 KB (53%)✓3rd
https://www.laposte.fr/ecom/_nuxt/ca3c383.modern.js76 KB56 KB (75%)✓3rd
https://cdn.tagcommander.com/1491/tc_LaboutiqueLaPoste_21.js80 KB46 KB (58%)✓3rd
https://try.abtasty.com/5714a31785e8fb2356ca3d1bd25e4a43/main.1e0116ad91cee0a97856.js105 KB40 KB (38%)✓3rd
https://www.laposte.fr/ecom/_nuxt/5130bf2.modern.js90 KB38 KB (42%)✓3rd
https://www.laposte.fr/ecom/_nuxt/678a774.modern.js49 KB36 KB (75%)✓3rd
https://www.laposte.fr/ecom/_nuxt/dc72e0b.modern.js49 KB35 KB (72%)✓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

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

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

F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
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.

C
Image Optimization
Action
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
https://www.laposte.fr/ecom/_nuxt/img/madeInFrance... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34 images 320 KB
0 oversized -0 KB
15 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.

C
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
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
10 fonts (242 KB)
PASS
10 fonts (242 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

242 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 12.7 s LCP 15.1 shttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Bold.3315de59.woff2Montserrat-Bold.3315de5... https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Bold.3315de59.woff2 — 25.8 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Light.6f9be861.woff2Montserrat-Light.6f9be8... https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Light.6f9be861.woff2 — 25.9 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Medium.618bb800.woff2Montserrat-Medium.618bb... https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Medium.618bb800.woff2 — 26.3 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Regular.96275b32.woff2Montserrat-Regular.9627... https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Regular.96275b32.woff2 — 26.2 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Semi-Bold.de1701b1.woff2Montserrat-Semi-Bold.de... https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Montserrat-Semi-Bold.de1701b1.woff2 — 25.0 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/laposte-regular.9ec6d683.woff2laposte-regular.9ec6d68... https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/laposte-regular.9ec6d683.woff2 — 27.2 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/laposte-light.1556e79f.woff2laposte-light.1556e79f.... https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/laposte-light.1556e79f.woff2 — 28.5 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Roboto-Regular.6aeb1341.woff2Roboto-Regular.6aeb1341... https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Roboto-Regular.6aeb1341.woff2 — 19.1 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Roboto-Medium.ae03171c.woff2Roboto-Medium.ae03171c.... https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Roboto-Medium.ae03171c.woff2 — 19.0 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Roboto-Bold.9321daa6.woff2Roboto-Bold.9321daa6.woff2 https://www.laposte.fr/ecom/_nuxt/node_modules/@lpel/phoenix-front-libraries-solaris/dist/fonts/Roboto-Bold.9321daa6.woff2 — 18.7 KiB — 0 ms — font-display: swap
Montserrat-Bold.3315de5... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Montserrat-Light.6f9be8... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Montserrat-Medium.618bb... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Montserrat-Regular.9627... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Montserrat-Semi-Bold.de... woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
laposte-regular.9ec6d68... woff2 swap
Size 27 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
laposte-light.1556e79f.... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Regular.6aeb1341... woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Medium.ae03171c.... woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Bold.9321daa6.woff2 woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
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)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
116 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
100% of JavaScript execution is third-party
First-party Third-party 6252ms · 1241KB · €68/mo
www.laposte.fr
Other
Costly
Execution 1663ms
Transfer 0 KB
Monthly Cost €18/mo
www.laposte.fr
Other
Costly
Execution 1154ms
Transfer 60 KB
Monthly Cost €13/mo
Unattributable
Other
Costly
Execution 1114ms
Transfer 0 KB
Monthly Cost €12/mo
www.laposte.fr
Other
Costly
Execution 848ms
Transfer 165 KB
Unused 53%
Monthly Cost €9/mo
www.laposte.fr
Other
Costly
Execution 321ms
Transfer 82 KB
Unused 36%
Monthly Cost €3/mo
try.abtasty.com
Other
Costly
Execution 209ms
Transfer 105 KB
Unused 38%
Monthly Cost €2/mo
cdn.trustcommander.net
Other
Optional
Execution 166ms
Transfer 38 KB
Monthly Cost €2/mo
cdn.tagcommander.com
Other
Optional
Execution 148ms
Transfer 80 KB
Unused 58%
Monthly Cost €2/mo
cdn.tagcommander.com
Other
Optional
Execution 136ms
Transfer 31 KB
Monthly Cost €1/mo
try.abtasty.com
Other
Optional
Execution 112ms
Transfer 8 KB
Monthly Cost €1/mo
www.laposte.fr
Other
Optional
Execution 100ms
Transfer 554 KB
Unused 81%
Monthly Cost €1/mo
cdn.tagcommander.com
Other
Optional
Execution 85ms
Transfer 34 KB
Monthly Cost €1/mo
cdn.tagcommander.com
Other
Optional
Execution 79ms
Transfer 41 KB
Monthly Cost €1/mo
try.abtasty.com
Other
Optional
Execution 63ms
Transfer 11 KB
Monthly Cost €1/mo
cdn.tagcommander.com
Other
Optional
Execution 53ms
Transfer 31 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.laposte.fr adds 1663ms and costs ~€18/month
  • www.laposte.fr adds 1154ms and costs ~€13/month
  • Unattributable adds 1114ms and costs ~€12/month
  • www.laposte.fr adds 848ms and costs ~€9/month
  • www.laposte.fr adds 321ms and costs ~€3/month
  • try.abtasty.com adds 209ms and costs ~€2/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

www.laposte.fr takes 1663ms 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.laposte.fr takes 1154ms 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 1114ms 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.laposte.fr takes 848ms 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 www.laposte.fr'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

www.laposte.fr takes 321ms 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

try.abtasty.com takes 209ms 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

58% of cdn.tagcommander.com'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

81% of www.laposte.fr'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.

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