Performance
· 15 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.
982 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.15 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
77 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.19 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.
4.64 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 sFPage Weight BudgetAction3.3 MB transferred, 173 requestsFIX
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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction44 scripts, 764 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.sonarsource.com/c8f7fe3b0e41be846d5687592cf2018ff6e22687-549844e893eb3bf5e383.js | 267 KB | 155 KB (58%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9JZ0GZ5TC6&cx=c>m=4e64k1h2 | 178 KB | 111 KB (62%) | ✓ | 3rd |
| https://www.sonarsource.com/035c3a5dbce655498ebf426080fef9033b4583db-1ffbc2f25ceab03acf47.js | 109 KB | 88 KB (81%) | ✓ | 3rd |
| https://www.sonarsource.com/8833ea00-5675f366aff249faebe8.js | 286 KB | 87 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-757017194&cx=c>m=4e64k1h2 | 132 KB | 83 KB (63%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-56V34P9 | 179 KB | 75 KB (42%) | ✓ | 3rd |
| https://www.sonarsource.com/commons-a025d04d5e6150db4508.js | 116 KB | 58 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9JZ0GZ5TC6 | 178 KB | 57 KB (32%) | ✓ | 3rd |
| https://www.sonarsource.com/app-9c6eb77770f79adf75fe.js | 284 KB | 50 KB (18%) | ✓ | 3rd |
| https://www.sonarsource.com/4251bcea8c3d6c03a2f3d58c77108ee15f2c189d-b56b2dd3df726b61f07e.js | 3 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 InventoryAction173 resources · 3.3 MB · 764 KB savings availableFIX
~763.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 173 resources | 3.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction73 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
CJS Execution CostAction1393ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 287ms | 14ms | 0ms | 3rd |
| https://www.sonarsource.com/ | 283ms | 10ms | 1ms | 3rd |
| https://www.sonarsource.com/app-9c6eb77770f79adf75fe.js | 204ms | 106ms | 34ms | 3rd |
| https://www.sonarsource.com/framework-8d9d04c3dafa026af7dd.js | 182ms | 170ms | 2ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9JZ0GZ5TC6 | 97ms | 85ms | 11ms | 3rd |
| https://euob.sd19403.sonarsource.com/sxp/i/ec9ce1449fc9fe8879e7b666ca8b5629.js | 96ms | 74ms | 2ms | 3rd |
| https://www.sonarsource.com/commons-a025d04d5e6150db4508.js | 90ms | 59ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-56V34P9 | 81ms | 62ms | 11ms | 3rd |
| https://www.sonarsource.com/9ff5b10e-5e7017a8648c50602083.js | 73ms | 73ms | 0ms | 3rd |
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 Loading3 fonts (87 KB)PASS
Web fonts
3
87 KB total
Render-blocking
0
of 3
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 HintsNo optimization neededPASS
Network Waterfall173 requests over 4173msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 287ms | 0 KB | — | €1/mo | Costly |
www.sonarsource.com www.sonarsource.com | Other | 283ms | 46 KB | — | €1/mo | Costly |
www.sonarsource.com www.sonarsource.com | Other | 204ms | 284 KB | 18% | €1/mo | Costly |
www.sonarsource.com www.sonarsource.com | Other | 182ms | 43 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 97ms | 178 KB | 32% | €0/mo | Optional |
euob.sd19403.sonarsource.com euob.sd19403.sonarsource.com | Other | 96ms | 45 KB | — | €0/mo | Optional |
www.sonarsource.com www.sonarsource.com | Other | 90ms | 116 KB | 50% | €0/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 81ms | 179 KB | 42% | €0/mo | Optional |
www.sonarsource.com www.sonarsource.com | Other | 73ms | 3 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 287ms and costs ~€1/month
- www.sonarsource.com adds 283ms and costs ~€1/month
- www.sonarsource.com adds 204ms and costs ~€1/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
Unattributable takes 287ms 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
www.sonarsource.com takes 283ms 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
www.sonarsource.com takes 204ms 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
50% of www.sonarsource.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