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Critical CSS: Above-the-Fold Rendering PipelineWithout Critical CSSHTML loaded - waiting for CSS...Render-Blocking: styles.css (180 KB)Render-Blocking: vendor.css (95 KB)Blocked 1.8sLCP: 3.2sFCP: 2.4sWhite screen until CSS fully loadedWith Critical CSSInline Critical CSS (8 KB in HTML Head)Header, Hero, Navigation, Typography, LayoutInstant rendering of visible areaLoad remaining CSS async: media=print, onload=this.media=allLCP: 1.4sFCP: 0.6sInstantly visible content, rest loads in backgroundResult: 56% Faster LCP | 75% Faster FCP1. ExtractIdentify critical-path CSSfor the viewportPenthouse, Critical, Critters2. InlineEmbed critical CSS as styletag in the HTML headMax. 14 KB (TCP Window)3. Defer RestLoad full CSS asyncafter initial renderingmedia=print + onload TrickCommon Pitfalls to AvoidToo much CSS inlinedWeb fonts forgottenFOUC not testedNo fallback styling
Performance May 18, 2026

Critical CSS: Visible Area Loaded in Milliseconds

Extract, inline and automate Critical CSS. Load the visible area in milliseconds and sustainably improve your LCP score.

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Image Optimization: Format PipelineSource ImagePNG/JPEG (2400x1600)3.2 MB OriginalBuild Pipeline1. Resize (srcset breakpoints)2. Format conversionOutput FormatsAVIFWebPJPEGFallback chain in picture elementResponsive Delivery with srcset and sizesMobile400w AVIF: 18 KB400w WebP: 24 KBSavings: 99%Tablet800w AVIF: 42 KB800w WebP: 58 KBSavings: 98%Desktop1200w AVIF: 78 KB1200w WebP: 105 KBSavings: 97%Retina2400w AVIF: 145 KB2400w WebP: 195 KBSavings: 94%50%smaller than WebP96%Browser Support WebP92%Browser Support AVIF-40%LCP ImprovementLazy Loading StrategyAbove the Fold: eagerViewport + 200px: loading=lazyfetchpriority=high for LCPdecoding=async
Performance May 15, 2026

Image Optimization 2026: WebP, AVIF and Responsive Delivery

WebP, AVIF, responsive images and lazy loading: How to optimize images for faster loading times, better Core Web Vitals and up to 95% smaller image data.

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JavaScript Performance Budget PipelineSource Bundle1.8 MB JavaScript (uncompressed)145 npm packagesTBT: 3200ms | INP: 450msOptimizationTree ShakingCode SplittingDead Code EliminationOptimized Bundle380 KB JavaScript (compressed)42 npm packagesTBT: 280ms | INP: 85msPerformance Budget: max 150 KB JS (initial, compressed)Critical PathFramework Core: 45 KBRouter: 8 KBCritical CSS-in-JS: 12 KBTotal: 65 KBLazy ChunksProduct Page: 28 KBCheckout: 35 KBSearch: 18 KBLoaded on demandThird-PartyAnalytics: 22 KBConsent: 15 KBChat Widget: 45 KBBudget Risk!Bundle AnalysisTreemap visualizationDuplicate detectionImport cost trackingCI/CD integration-79%JS bundle reduced200msINP target150KBInitial JS budget3xfaster interactionOptimization Path1. Audit and Measure2. Define Budget3. Split and Shake4. Audit Third-Party5. CI/CD Checks
Performance May 12, 2026

JavaScript and Performance Budgets: Less Code, Faster Websites

Minimize JavaScript impact on INP and loading time: performance budgets, code splitting, tree shaking and third-party management for Core Web Vitals.

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Multi-Tier Caching ArchitectureBrowser / ClientCache-Control, ETag, SWCDN Edge (Global PoPs)Static assets, HTML cache, BrotliVarnish HTTP AcceleratorVCL Rules | Grace Mode | Cache Tags | ESIHit Rate: 95%+ | Response Time: 1-5msCache MISSRedisSession Cache: 0.2msObject Cache: 0.5msFragment Cache: 0.3msApplication ServerPHP/Node.js RuntimeOPcache / JITTemplate RenderingDatabaseQuery Cache: disabledInnoDB Buffer Pool: 80%Slow Query Log: active1-5msVarnish Cache Hit95%+Cache Hit Rate0.2msRedis Latency-90%TTFB ReductionCache-Control: max-age | ETag | stale-while-revalidate | Purge API | Tag-based Invalidation
Performance May 9, 2026

Caching Strategies: Varnish, Redis and Browser Cache

Multi-tier caching architecture with Varnish, Redis and browser cache: strategies for TTFB under 100ms, 95% cache hit rate and optimal invalidation.

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