Performance
· 27 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.
2.66 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.99 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
893 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.46 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.
17.48 s
Page Load Progression
FPage Weight BudgetAction7.7 MB transferred, 86 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4420ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1052ms | 23ms | 0ms | 1st |
| https://www.mbc.net/_next/static/chunks/framework-0c7baedefba6b077.js | 628ms | 464ms | 47ms | 3rd |
| https://www.mbc.net/ | 558ms | 49ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-C5VTCS066M&cx=c>m=4e6ae1h1 | 506ms | 411ms | 88ms | 3rd |
| https://www.mbc.net/_next/static/chunks/66-474819431accbba8.js | 396ms | 269ms | 13ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202610120101/pubads_impl.js | 384ms | 263ms | 116ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KWV3WMJ | 276ms | 206ms | 62ms | 3rd |
| https://www.mbc.net/_next/static/chunks/main-0431c06220913ed0.js | 189ms | 164ms | 18ms | 3rd |
| https://securepubads.g.doubleclick.net/tag/js/gpt.js | 180ms | 157ms | 21ms | 3rd |
| https://www.mbc.net/_next/static/chunks/pages/index-8ba018b79b3c19d0.js | 138ms | 116ms | 3ms | 3rd |
Showing top 10 of 12 scripts
FJS BundlesAction23 scripts, 603 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202610120101/pubads_impl.js | 213 KB | 161 KB (75%) | ✓ | 3rd |
| https://www.mbc.net/_next/static/chunks/6-5e2d64e1b48211be.js | 121 KB | 96 KB (79%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-C5VTCS066M&cx=c>m=4e6ae1h1 | 167 KB | 70 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KWV3WMJ | 133 KB | 64 KB (49%) | ✓ | 3rd |
| https://www.mbc.net/_next/static/chunks/483-3ad7b81cf3af712e.js | 109 KB | 60 KB (55%) | ✓ | 3rd |
| https://www.mbc.net/_next/static/chunks/main-0431c06220913ed0.js | 115 KB | 44 KB (39%) | ✓ | 3rd |
| https://www.mbc.net/_next/static/chunks/framework-0c7baedefba6b077.js | 138 KB | 38 KB (27%) | ✓ | 3rd |
| https://www.mbc.net/_next/static/chunks/pages/_app-e70bf017a4adba95.js | 113 KB | 37 KB (33%) | ✓ | 3rd |
| https://www.mbc.net/_next/static/chunks/66-474819431accbba8.js | 64 KB | 33 KB (52%) | ✓ | 3rd |
| https://www.mbc.net/_next/static/chunks/pages/index-8ba018b79b3c19d0.js | 14 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
DAsset CompressionAction2 of 2 asset hosts serve text uncompressedFIX
FPage Weight InventoryAction86 resources · 7.7 MB · 603 KB savings availableFIX
~603.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 86 resources | 7.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization36 images, 0 KB saveableREVIEW
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
CDocument CompressionActionDocument response served uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
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 Loading6 fonts (57 KB)PASS
Web fonts
6
57 KB total
Render-blocking
0
of 6
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 Hints11 hints, 0 missing preconnectsPASS
Current Resource Hints
11 resource hints configured
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+CSS Performance DepthNo CSS performance depth issues detectedPASS
Network Waterfall86 requests over 1388msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.mbc.net www.mbc.net | Other | 628ms | 138 KB | 27% | €7/mo | Costly |
www.mbc.net www.mbc.net | Other | 558ms | 46 KB | — | €6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 506ms | 167 KB | 42% | €5/mo | Costly |
www.mbc.net www.mbc.net | Other | 396ms | 64 KB | 52% | €4/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 384ms | 213 KB | 75% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 276ms | 133 KB | 49% | €3/mo | Costly |
www.mbc.net www.mbc.net | Other | 189ms | 115 KB | 39% | €2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 180ms | 37 KB | — | €2/mo | Optional |
www.mbc.net www.mbc.net | Other | 138ms | 14 KB | — | €2/mo | Optional |
www.mbc.net www.mbc.net | Other | 60ms | 113 KB | 33% | €1/mo | Optional |
www.mbc.net www.mbc.net | Other | 54ms | 109 KB | 55% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.mbc.net adds 628ms and costs ~€7/month
- www.mbc.net adds 558ms and costs ~€6/month
- Google Tag Manager adds 506ms and costs ~€5/month
- www.mbc.net adds 396ms and costs ~€4/month
- securepubads.g.doubleclick.net adds 384ms and costs ~€4/month
- Google Tag Manager adds 276ms and costs ~€3/month
76% 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.mbc.net takes 628ms 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.mbc.net takes 558ms 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 506ms 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.mbc.net takes 396ms 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
52% of www.mbc.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
securepubads.g.doubleclick.net takes 384ms 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
75% 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
Google Tag Manager takes 276ms 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
55% of www.mbc.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
Image Optimization45 images, 23 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
45
Total Size
23 KB