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Render Blocking

Render blocking

Render Blocking

Render Blocking describes resources, usually CSS and synchronous JavaScript, that the browser must download and process…
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Core web vitals

Core Web Vitals

Core Web Vitals are a set of three Google metrics that measure real-world loading, interactivity, and…
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Diagram of the three core web vitals, lcp for loading, inp for responsiveness, and cls for visual stability, with good thresholds and top fixes for each.

Core Web Vitals FAQ: Complete Guide to LCP, INP, and CLS

Complete Core Web Vitals FAQ covering LCP, INP, CLS metrics, measurement tools, and optimization strategies. Expert…
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Diagram of the four image optimization levers, format, compression, dimensions, and loading strategy, feeding a lighter lcp image that paints in under 2. 5 seconds.

Image Optimization

Image Optimization is the practice of reducing image file size and improving delivery so pages load…
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Bar chart of the ttfb chain showing redirects, dns, tcp and tls, cdn edge and origin processing time costs against google's timing bands.

TTFB (Time to First Byte)

TTFB (Time to First Byte) is the time between a browser requesting a page and receiving…
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Diagram showing critical css inlined in the head for above the fold content while the full stylesheet loads deferred.

Critical CSS

Critical CSS is the minimal set of styles needed to render the visible, above-the-fold portion of…
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