Performance
· 23 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.
692 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.32 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
40 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.
1.50 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.
3.55 s
Page Load Progression
FPage Weight BudgetAction8.7 MB transferred, 118 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 BundlesAction37 scripts, 832 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 | 159 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=4e6ae1 | 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 | 59 KB (55%) | ✓ | 3rd |
| https://www.mbc.net/_next/static/chunks/256-a036240009b07b6b.js | 0 KB | 55 KB (82%) | ✓ | 3rd |
| https://www.mbc.net/_next/static/chunks/256-a036240009b07b6b.js | 67 KB | 55 KB (82%) | ✓ | 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 |
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 InventoryAction118 resources · 8.7 MB · 832 KB savings availableFIX
~832.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 118 resources | 8.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization40 images, 0 KB saveableREVIEW
CJS Execution CostAction1265ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 442ms | 9ms | 0ms | 1st |
| https://www.mbc.net/_next/static/chunks/framework-0c7baedefba6b077.js | 158ms | 116ms | 7ms | 3rd |
| https://www.mbc.net/ | 144ms | 10ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-C5VTCS066M&cx=c>m=4e6ae1 | 128ms | 104ms | 19ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202610120101/pubads_impl.js | 115ms | 76ms | 33ms | 3rd |
| https://www.mbc.net/_next/static/chunks/main-0431c06220913ed0.js | 106ms | 88ms | 5ms | 3rd |
| https://www.mbc.net/_next/static/chunks/66-474819431accbba8.js | 95ms | 61ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KWV3WMJ | 77ms | 58ms | 17ms | 3rd |
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
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 HintsNo optimization neededPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
Network Waterfall118 requests over 1673msINFO
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 | 158ms | 138 KB | 27% | €2/mo | Optional |
www.mbc.net www.mbc.net | Other | 144ms | 46 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 128ms | 167 KB | 42% | €1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 115ms | 213 KB | 75% | €1/mo | Optional |
www.mbc.net www.mbc.net | Other | 106ms | 115 KB | 39% | €1/mo | Optional |
www.mbc.net www.mbc.net | Other | 95ms | 64 KB | 52% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 77ms | 133 KB | 49% | €1/mo | Optional |
65% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
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
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
Image Optimization45 images, 23 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
45
Total Size
23 KB