Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.96 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.79 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.31 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.024
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.33 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.
13.34 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction3701ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.journaldunet.com/ | 772ms | 122ms | 8ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5FLZCG8 | 741ms | 587ms | 71ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N4SNZN | 348ms | 254ms | 71ms | 3rd |
| Unattributable | 339ms | 16ms | 0ms | 3rd |
| https://astatic.ccmbg.com/ccmcms_journaldunet/dist/app/js/app.1e3f2b128b615293.js | 313ms | 112ms | 12ms | 3rd |
| https://cdn.appconsent.io/tcf2/32.12.1/1684.bundle.js | 308ms | 240ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1N7CB29V3N&cx=c>m=4e64k0 | 244ms | 204ms | 39ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 193ms | 141ms | 50ms | 3rd |
| https://astatic.ccmbg.com/asl3/dist/asl.journaldunet.466a78dc386bb053e459.js | 108ms | 79ms | 16ms | 3rd |
| https://cdn.appconsent.io/tcf2/current/core.bundle.js | 79ms | 55ms | 22ms | 3rd |
Showing top 10 of 14 scripts
DJS BundlesAction25 scripts, 483 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 188 KB | 142 KB (76%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1N7CB29V3N&cx=c>m=4e64k0 | 151 KB | 61 KB (40%) | ✓ | 3rd |
| https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js | 66 KB | 59 KB (89%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5FLZCG8 | 137 KB | 59 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N4SNZN | 185 KB | 56 KB (30%) | ✓ | 3rd |
| https://cdn.appconsent.io/tcf2/current/core.bundle.js | 56 KB | 31 KB (56%) | ✓ | 3rd |
| https://astatic.ccmbg.com/asl3/dist/asl.journaldunet.466a78dc386bb053e459.js | 41 KB | 26 KB (64%) | ✓ | 3rd |
| https://astatic.ccmbg.com/ccmcms_journaldunet/dist/app/js/app.1e3f2b128b615293.js | 34 KB | 25 KB (77%) | ✓ | 3rd |
| https://astatic.ccmbg.com/ccmcms_journaldunet/dist/app/js/commons.d613c78ec39a58c9.js | 39 KB | 23 KB (59%) | ✓ | 3rd |
| https://cdn-analytics.alketech.eu/collector.js | 19 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction66 resources · 1.4 MB · 483 KB savings availableFIX
~482.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 66 resources | 1.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.4 MB transferred, 66 requestsREVIEW
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
CImage OptimizationAction21 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (66 KB)PASS
Web fonts
4
66 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints8 hints, 0 missing preconnectsPASS
Current Resource Hints
8 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall66 requests over 1830msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.journaldunet.com www.journaldunet.com | Other | 772ms | 36 KB | — | €8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 741ms | 137 KB | 43% | €8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 348ms | 185 KB | 30% | €4/mo | Costly |
Unattributable Unattributable | Other | 339ms | 0 KB | — | €4/mo | Costly |
astatic.ccmbg.com astatic.ccmbg.com | Other | 313ms | 34 KB | 77% | €3/mo | Costly |
cdn.appconsent.io cdn.appconsent.io | Other | 308ms | 25 KB | — | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 244ms | 151 KB | 40% | €3/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 193ms | 188 KB | 76% | €2/mo | Optional |
astatic.ccmbg.com astatic.ccmbg.com | Other | 108ms | 41 KB | 64% | €1/mo | Optional |
cdn.appconsent.io cdn.appconsent.io | Other | 79ms | 56 KB | 56% | €1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 72ms | 34 KB | — | €1/mo | Optional |
ajax.googleapis.com ajax.googleapis.com | Other | 64ms | 30 KB | — | €1/mo | Optional |
ajax.googleapis.com ajax.googleapis.com | Other | 60ms | 66 KB | 89% | €1/mo | Optional |
cdn-analytics.alketech.eu cdn-analytics.alketech.eu | Other | 60ms | 19 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.journaldunet.com adds 772ms and costs ~€8/month
- Google Tag Manager adds 741ms and costs ~€8/month
- Google Tag Manager adds 348ms and costs ~€4/month
- Unattributable adds 339ms and costs ~€4/month
- astatic.ccmbg.com adds 313ms and costs ~€3/month
- cdn.appconsent.io adds 308ms and costs ~€3/month
- Google Tag Manager adds 244ms and costs ~€3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.journaldunet.com takes 772ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 741ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 348ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 339ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
astatic.ccmbg.com takes 313ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
77% of astatic.ccmbg.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
cdn.appconsent.io takes 308ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 244ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
76% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
64% of astatic.ccmbg.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
56% of cdn.appconsent.io's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
89% of ajax.googleapis.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev