The free speed trick your app already gets — and exactly where it stops

Distance costs time, so a CDN keeps copies of your site on servers near your users. What can be cached at the edge, and what can't. Tap the ladder…

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The edge is servers near your users; a CDN is a network of them

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Serving from nearby cuts the distance a request travels, so pages load faster

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Public content caches at the edge; private, per-user data must not

What this means for your app

On most hosts, your images, CSS and public pages are cached at the edge automatically, for free; that's most of your speed. Private or personalised responses are (correctly) not cached, so don't try…

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The free speed trick your app already gets — and exactly where it stops

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