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Looking after your channels – regularly, in your tone of voice and without guessing at the effect.
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Home
Glossary
Web Performance & Technology
Web Performance & Technology
This category explains the technical foundations of fast, reliable websites – from the Core Web Vitals metrics INP, LCP and CLS through hosting and caching to redirects and domain migrations.
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Browser Caching
Browser caching lets a visitor's browser store website files locally after the first visit, so that repeat visits load …
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CDN (Content Delivery Network)
A CDN (Content Delivery Network) is a globally distributed network of servers that delivers the static content of a …
Choosing Web Hosting
Choosing web hosting – shared hosting, managed or specialised hosting, or a cloud and CDN-backed solution – determines …
CLS (Cumulative Layout Shift)
Cumulative Layout Shift (CLS) measures unexpected visual movement of page elements after rendering – text jumping down …
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HTTP/3 (QUIC)
HTTP/3 is the latest version of the HTTP protocol for transferring web content. It is based on QUIC, a transport …
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Image Compression (WebP & AVIF)
WebP and AVIF are modern image formats that reach markedly smaller file sizes than JPEG or PNG at comparable visual …
INP (Interaction to Next Paint)
INP measures the time from a user interaction — a click, tap or key press — to the browser's visible response, and has …
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Lazy Loading
Lazy loading is a technique in which images, videos or other resources are loaded only shortly before they enter the …
LCP (Largest Contentful Paint)
Largest Contentful Paint (LCP) measures how long it takes for the largest visible content element on a page – usually a …
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Minification (CSS & JavaScript)
Minification is the removal of unnecessary characters – whitespace, comments, long variable names – from CSS and …
Mobile-First Indexing
Mobile-first indexing means that Google predominantly uses the mobile version of a website's content for indexing and …
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PageSpeed Insights
PageSpeed Insights is Google's free tool that analyses a given URL and shows its Core Web Vitals values, both from real …
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Responsive Design
Responsive design is an approach to website design in which the layout adapts automatically to different screen sizes …