What is caching? Why it's fast, and why it goes stale

Lesson 3 of when it breaks: why a vibe-coded page can be lightning fast, then suddenly show something out of date. What a cache is, why it makes… Aliteq Sam Ortega · Build Editor

A cache stores a ready answer so repeat requests skip the work

It's where most of the web's speed comes from

A stale cache showing old data is the classic bug, controlled by the copy's lifetime (TTL)

If your app shows stale data after a change, a cache is holding an old copy; the fix is a shorter lifetime or clearing it. If a page is needlessly slow, caching a rarely-changing result speeds it…

What this means for your app

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