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.
1.43 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.54 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
7 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.
1.53 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.
1.68 s
Page Load Progression
FPage Weight BudgetAction4.5 MB transferred, 100 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
DPage Weight InventoryAction100 resources · 4.5 MB · 145 KB savings availableFIX
~144.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 100 resources | 4.5 MiB | ||||||
BImage Optimization26 images, 0 KB saveableREVIEW
BJS Execution Cost634ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.merkur.de/ | 217ms | 2ms | 1ms | 3rd |
| Unattributable | 191ms | 44ms | 0ms | 3rd |
| https://widgets.outbrain.com/outbrain.js | 159ms | 38ms | 7ms | 3rd |
| https://idcdn.de/static/common/js/vendor/requirejs/require.2.1.18.min.js | 67ms | 55ms | 0ms | 3rd |
BJS Bundles27 scripts, 145 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdntrf.com/trf-merkur.js | 88 KB | 67 KB (77%) | ✓ | 3rd |
| https://widgets.outbrain.com/outbrain.js | 110 KB | 54 KB (49%) | ✓ | 3rd |
| https://cdn.opencmp.net/tcf-v2/platforms/modern/cmp-latest.js | 50 KB | 24 KB (48%) | ✓ | 3rd |
| https://www.merkur.de/sso/static/login/common/js/id-userid-sso.min-1798d8d1f7e05f44dff8486ffce2b026.js | 7 KB | — | ✓ | 3rd |
| https://idcdn.de/static/common/js/build/modules/2883373e8603b86fc54df3725af60091/id.core.js | 3 KB | — | ✓ | 3rd |
| https://cdn.opencmp.net/tcf-v2/cmp-stub-latest.js | 11 KB | — | ✓ | 3rd |
| https://cl.k5a.io/614855c8e16cdd72901684f2.module.js | 29 KB | — | ✓ | 3rd |
| https://idcdn.de/static/common/js/vendor/requirejs/require.2.1.18.min.js | 6 KB | — | ✓ | 3rd |
| https://cdn.binsiad.com/ins-ag/ins-ag.min.js?e=1 | 26 KB | — | ✓ | 3rd |
| https://mv.outbrain.com/Multivac/api/get?url=https%3A%2F%2Fwww.merkur.de%2F&idx=0&rand=42272&widgetJSId=AR_13&va=true&et=true&format=html&px=52&py=18310&vpd=17370&settings=true&recs=true&cw=965&key=NANOWDGT01&tch=0&wdr-cs=1&adblck=0&abwl=0&obRecsAbtestVars=1550:5795&wdr-attribution-src=1&activeTab=true&lsl=1&cha=x86&chb=64&chfv=%5B%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22147.0.7727.101%22%7D%2C%7B%22brand%22%3A%22Not.A%2FBrand%22%2C%22version%22%3A%228.0.0.0%22%7D%5D&chpv=10.15.7&chp=macOS&clientType=21&clientVer=90acd988123_2026-04-20&devMem=8&scrOri=l&hwc=4&ttfb=41&netQ=4g&ccnsnt=false&navt=navigate&version=90acd988123_2026-04-20&sig=Poz3K8F5&apv=false&osLang=en-US&winW=1350&winH=940&scrW=800&scrH=600&dpr=1&secured=true&cmpStat=0&ccpaStat=0&ogn=https%3A%2F%2Fwww.merkur.de%2F | 10 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (46 KB)PASS
Web fonts
3
46 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
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: ALL-INKL.COM
AHTTP Cachingmax-age=604800 (1 week)PASS
max-age=604800
| Directive | Value | Meaning |
|---|---|---|
| max-age | 604800 | Cache for 1 week |
Network Waterfall100 requests over 1535msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.merkur.de www.merkur.de | Other | 217ms | 106 KB | — | €2/mo | Costly |
Unattributable Unattributable | Other | 191ms | 0 KB | — | €2/mo | Optional |
widgets.outbrain.com widgets.outbrain.com | Other | 159ms | 110 KB | 49% | €2/mo | Optional |
idcdn.de idcdn.de | Other | 67ms | 6 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.merkur.de adds 217ms and costs ~€2/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.merkur.de takes 217ms 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