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https://www.laposte.fr

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
49
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.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

1.95 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.

444 ms

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.

2.89 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.

3.52 s

Page Load Progression

391 ms
782 ms
1.2 s
1.6 s
2.0 s
2.3 s
2.7 s
3.1 s
Checks
14
6 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
5.8 MB transferred, 340 requests
FIX
5.8 MB transferred, 340 requests
Critical::
Page weighs 22.1 MB (5.8 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
CSS is 1.1 MB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 1.1 MB
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
Fonts are 228 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 228 KB
Warning::
340 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.2 g CO2 per page load
5.8 MB / 2.4 MB budget
5.8 MB transferred
340 requests
1.2 g CO2 per page load
Other 2.1 MiB 37%
JavaScript 1.2 MiB 20%
CSS 1.1 MiB 19%
Images 1.1 MiB 18%
Fonts 227.8 KiB 4%
HTML 62.3 KiB 1%
Other 13.8 KiB 0%
Other 11.0 KiB 0%
Other 856 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

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

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
JS Execution Cost
Action
2715ms total JS execution
FIX
2715ms total JS execution
Warning::
https://www.laposte.fr/ecom/_nuxt/C6aQWrs0.js: 623ms CPU time
Warning::
Unattributable: 549ms CPU time
Warning::
https://www.laposte.fr/: 525ms CPU time
Warning::
https://www.laposte.fr/ruxitagentjs_ICA7NVfhqrux_1...: 492ms CPU time
Info::
https://www.laposte.fr/ecom/_nuxt/entry.C0t7vErM.c...: 227ms CPU time
Info::
Third-party scripts: 630ms (23% of total)

Main Thread Breakdown

Other 39% Script Evaluation 33% Style & Layout 14% Parse HTML & CSS 8%
ScriptTotalScriptingParse/CompileParty
https://www.laposte.fr/ecom/_nuxt/C6aQWrs0.js623ms26ms0ms1st
Unattributable549ms159ms0ms3rd
https://www.laposte.fr/525ms3ms1ms1st
https://www.laposte.fr/ruxitagentjs_ICA7NVfhqrux_10333260303165926.js492ms448ms9ms1st
https://www.laposte.fr/ecom/_nuxt/entry.C0t7vErM.css227ms0ms0ms1st
https://www.laposte.fr/poc-av/chatbot/main.CmxAWFs4.js144ms132ms10ms1st
https://try.abtasty.com/5714a31785e8fb2356ca3d1bd25e4a43/main.1e0116ad91cee0a97856.js81ms62ms14ms3rd
https://www.laposte.fr/ecom/_nuxt/CnNrbjCf.js74ms58ms0ms1st
F
JS Bundles
Action
98 scripts, 510 KB unused
FIX
98 scripts, 510 KB unused
Warning::
https://www.laposte.fr/ecom/_nuxt/C6m16DWd.js: 279 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.laposte.fr/poc-av/chatbot/main.CmxAWFs...: 116 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.tagcommander.com/1491/tc_LaboutiqueLaP...: 45 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://try.abtasty.com/5714a31785e8fb2356ca3d1bd2...: 40 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.laposte.fr/ruxitagentjs_ICA7NVfhqrux_1...: 29 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 510 KB
510 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.laposte.fr/ecom/_nuxt/C6m16DWd.js508 KB279 KB (55%)✓1st
https://www.laposte.fr/poc-av/chatbot/main.CmxAWFs4.js133 KB116 KB (88%)✓1st
https://cdn.tagcommander.com/1491/tc_LaboutiqueLaPoste_21.js80 KB45 KB (57%)✓3rd
https://try.abtasty.com/5714a31785e8fb2356ca3d1bd25e4a43/main.1e0116ad91cee0a97856.js105 KB40 KB (39%)✓3rd
https://www.laposte.fr/ruxitagentjs_ICA7NVfhqrux_10333260303165926.js82 KB29 KB (36%)✓1st
https://www.laposte.fr/ecom/_nuxt/CnNrbjCf.js4 KB—✓1st
https://www.laposte.fr/ecom/_nuxt/BdKfpypI.js1 KB—✓1st
https://www.laposte.fr/ecom/_nuxt/DJZIH3mZ.js1 KB—✓1st
https://www.laposte.fr/ecom/_nuxt/BPVQLFSw.js0 KB—✓1st
https://www.laposte.fr/ecom/_nuxt/ZZSzK1uO.js2 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

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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
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
Info::
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

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
B
Image Optimization
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Info::
All images are well-optimized
44 images 1.0 MB
0 oversized -0 KB
15 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
8% third-party, 0 ms blocking
PASS
8% third-party, 0 ms blocking
Info::
Third-party code accounts for 8% of page weight (447.6 KiB of 5.8 MiB)
Info::
Third-party blocking time is low (0 ms)
92%
First-party Third-party
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
9 fonts (228 KB)
PASS
9 fonts (228 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

228 KB total

Render-blocking

0

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 2.0 s LCP 3.1 shttps://www.laposte.fr/ecom/_nuxt/Montserrat-Bold.DKC_CUCq.woff2Montserrat-Bold.DKC_CUC... https://www.laposte.fr/ecom/_nuxt/Montserrat-Bold.DKC_CUCq.woff2 — 25.9 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/laposte-regular.Czc1z7iL.woff2laposte-regular.Czc1z7i... https://www.laposte.fr/ecom/_nuxt/laposte-regular.Czc1z7iL.woff2 — 28.8 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/Roboto-Medium.CF9-ZKNh.woff2Roboto-Medium.CF9-ZKNh.... https://www.laposte.fr/ecom/_nuxt/Roboto-Medium.CF9-ZKNh.woff2 — 19.0 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/laposte-light.C-AUD0cx.woff2laposte-light.C-AUD0cx.... https://www.laposte.fr/ecom/_nuxt/laposte-light.C-AUD0cx.woff2 — 29.9 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/Roboto-Regular.BJU_f3hk.woff2Roboto-Regular.BJU_f3hk... https://www.laposte.fr/ecom/_nuxt/Roboto-Regular.BJU_f3hk.woff2 — 19.2 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/Montserrat-Semi-Bold.CuXOa3e0.woff2Montserrat-Semi-Bold.Cu... https://www.laposte.fr/ecom/_nuxt/Montserrat-Semi-Bold.CuXOa3e0.woff2 — 25.2 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/Roboto-Bold.C-ZlbZ-v.woff2Roboto-Bold.C-ZlbZ-v.woff2 https://www.laposte.fr/ecom/_nuxt/Roboto-Bold.C-ZlbZ-v.woff2 — 18.7 KiB — 0 ms — font-display: swaphttps://www.laposte.fr/ecom/_nuxt/Montserrat-Regular.FgkLormy.woff2Montserrat-Regular.FgkL... https://www.laposte.fr/ecom/_nuxt/Montserrat-Regular.FgkLormy.woff2 — 26.3 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2JTUSjIg1_i6t8kCHKm459Wl... https://fonts.gstatic.com/s/montserrat/v31/JTUSjIg1_i6t8kCHKm459WlhyyTh89Y.woff2 — 34.7 KiB — 0 ms — font-display: swap
Montserrat-Bold.DKC_CUC... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
laposte-regular.Czc1z7i... woff2 swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Medium.CF9-ZKNh.... woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
laposte-light.C-AUD0cx.... woff2 swap
Size 30 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Regular.BJU_f3hk... woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Montserrat-Semi-Bold.Cu... woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Roboto-Bold.C-ZlbZ-v.woff2 woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Montserrat-Regular.FgkL... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
JTUSjIg1_i6t8kCHKm459Wl... woff2 swap
Size 35 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
Network Waterfall
340 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
23% of JavaScript execution is third-party
First-party Third-party 630ms · 105KB · €7/mo
Unattributable
Other
Costly
Execution 549ms
Transfer 0 KB
Monthly Cost €6/mo
try.abtasty.com
Other
Optional
Execution 81ms
Transfer 105 KB
Unused 39%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 549ms and costs ~€6/month

Unattributable takes 549ms 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.

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