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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
1
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
65
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.

509 ms

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

1.36 s

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

9 ms

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

0.301

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

1.01 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.

2.13 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
14
7 PASS 4 REVIEW 1 FIX
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
Page Weight Budget
Action
1.7 MB transferred, 149 requests
REVIEW
1.7 MB transferred, 149 requests
Info::
Page weighs 7.2 MB (1.7 MB transferred)
Warning::
JavaScript is 781 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 781 KB
Info::
Fonts are 370 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 370 KB
Warning::
149 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
149 requests
0.35 g CO2 per page load
JavaScript 780.9 KiB 45%
Fonts 369.9 KiB 21%
Images 285.9 KiB 17%
CSS 186.4 KiB 11%
HTML 80.8 KiB 5%
Other 13.7 KiB 1%
Other 6.2 KiB 0%
Other 750 B 0%
Other 533 B 0%
Other 0 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

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

B
Image Optimization
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 286 KB
0 oversized -0 KB
13 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

B
JS Execution Cost
923ms total JS execution
REVIEW
923ms total JS execution
Warning::
https://www.ovhcloud.com/fr/: 385ms CPU time
Info::
Unattributable: 227ms CPU time
Info::
https://www.ovhcloud.com/modules/custom/ovh_sentry...: 123ms CPU time
Info::
https://www.ovhcloud.com/sites/default/files/js/js...: 110ms CPU time
Info::
https://www.ovhcloud.com/_next-menu/_next/static/c...: 78ms CPU time
Info::
Third-party scripts: 227ms (25% of total)

Main Thread Breakdown

Style & Layout 29% Other 28% Script Evaluation 27% Parse HTML & CSS 6% Script Parsing & Compilation 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.ovhcloud.com/fr/385ms13ms0ms1st
Unattributable227ms28ms0ms3rd
https://www.ovhcloud.com/modules/custom/ovh_sentry/dist/sentry.min.js?v=1.0.3123ms16ms0ms1st
https://www.ovhcloud.com/sites/default/files/js/js_Q1qBxAU5YKT02TTYmW6zrgAOJ6BuiQ5sW5a53RkUemw.js110ms54ms5ms1st
https://www.ovhcloud.com/_next-menu/_next/static/chunks/framework-d7de93249215fb06.js78ms73ms5ms1st
C
JS Bundles
Action
80 scripts, 174 KB unused
REVIEW
80 scripts, 174 KB unused
Warning::
https://www.ovhcloud.com/7af16cdb/contrib/ovh_them...: 60 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://analytics.ovh.com/ovh/ovh_delta.js: 41 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ovhcloud.com/sites/default/files/js/js...: 26 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ovhcloud.com/_next-menu/_next/static/c...: 24 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ovhcloud.com/website/webcallback/asset...: 23 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 174 KB
174 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/odss-header/header--webcloud.min.js?v=1.0.260 KB60 KB (100%)✓1st
https://analytics.ovh.com/ovh/ovh_delta.js98 KB41 KB (42%)✓3rd
https://www.ovhcloud.com/sites/default/files/js/js_Q1qBxAU5YKT02TTYmW6zrgAOJ6BuiQ5sW5a53RkUemw.js60 KB26 KB (43%)✓1st
https://www.ovhcloud.com/_next-menu/_next/static/chunks/framework-d7de93249215fb06.js60 KB24 KB (41%)✓1st
https://www.ovhcloud.com/website/webcallback/assets/__federation_shared_react-dom.js44 KB23 KB (53%)✓1st
https://analytics.ovh.com/ovh/ovh_tags.js44 KB—✓3rd
https://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/odss-read-more/odss-read-more-card-specs-desktop.min.js?v=1.0.22 KB—✓1st
https://www.ovhcloud.com/sites/default/files/js/js_w6Z5GBi6dWMNbIGrb0uEelvcydyISKc2rxojrEgelAg.js22 KB—✓1st
https://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/ods-header/ods-header.min.js?v=1.0.207 KB—✓1st
https://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/ods-header/ods-header-universe.min.js?v=1.0.203 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

A+
Third-Party Impact
12% third-party, 0 ms blocking
PASS
12% third-party, 0 ms blocking
Info::
Third-party code accounts for 12% of page weight (203.8 KiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
88%
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
7 fonts (370 KB)
PASS
7 fonts (370 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

370 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 509 ms LCP 1.4 shttps://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/fonts/icons/icons.woff2?ba6e8521fd2b1726ef8bb907841c6df1icons.woff2 https://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/fonts/icons/icons.woff2?ba6e8521fd2b1726ef8bb907841c6df1 — 6.3 KiB — 0 ms — font-display: swaphttps://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/fonts/source-sans-pro/source-sans-pro-latin-400-normal.woff2source-sans-pro-latin-4... https://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/fonts/source-sans-pro/source-sans-pro-latin-400-normal.woff2 — 13.2 KiB — 0 ms — font-display: swaphttps://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/fonts/source-sans-pro/source-sans-pro-latin-700-normal.woff2source-sans-pro-latin-7... https://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/fonts/source-sans-pro/source-sans-pro-latin-700-normal.woff2 — 13.1 KiB — 0 ms — font-display: swaphttps://www.ovhcloud.com/_next-menu/_next/static/media/source-sans3-variable-custom.b05291b0.woff2source-sans3-variable-c... https://www.ovhcloud.com/_next-menu/_next/static/media/source-sans3-variable-custom.b05291b0.woff2 — 165.2 KiB — 0 ms — font-display: swaphttps://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/fonts/source-sans-pro/source-sans-pro-latin-600-normal.woff2source-sans-pro-latin-6... https://www.ovhcloud.com/7af16cdb/contrib/ovh_theme_patternlab/dist/fonts/source-sans-pro/source-sans-pro-latin-600-normal.woff2 — 13.2 KiB — 0 ms — font-display: swaphttps://www.ovhcloud.com/_next-menu/_next/static/media/source-sans3-variable-custom-italic.2e32522b.woff2source-sans3-variable-c... https://www.ovhcloud.com/_next-menu/_next/static/media/source-sans3-variable-custom-italic.2e32522b.woff2 — 134.0 KiB — 0 ms — font-display: swaphttps://www.ovhcloud.com/_next-menu/_next/static/media/icomoon.3c5da845.wofficomoon.3c5da845.woff https://www.ovhcloud.com/_next-menu/_next/static/media/icomoon.3c5da845.woff — 24.8 KiB — 0 ms — font-display: swap
icons.woff2 woff2 swap
Size 6 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
source-sans-pro-latin-4... woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
source-sans-pro-latin-7... woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
source-sans3-variable-c... woff2 swap
Size 165 KB
Load time 0 ms
Start 0 ms
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
source-sans-pro-latin-6... woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
source-sans3-variable-c... woff2 swap
Size 134 KB
Load time 0 ms
Start 0 ms
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
icomoon.3c5da845.woff woff swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~157 KB and ~314 ms

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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: OVHcloud

Network Waterfall
149 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
25% of JavaScript execution is third-party
First-party Third-party 227ms · 0KB · €1/mo
Unattributable
Other
Costly
Execution 227ms
Transfer 0 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 227ms and costs ~€1/month

Unattributable takes 227ms 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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