Step 5 of 7
Caching and queues
A cache (like Redis or a CDN) stores answers you'll need again so you don't recompute them. A message queue holds jobs to process later (send email, resize images) so the user isn't kept waiting.
Why it matters when you build with AI: Caching makes things fast, but stale cache is a classic bug. Queues make apps resilient when a third-party API is slow or down.
Quick check
Sending a welcome email shouldn't make sign-up wait. Use a…
Put the job on a queue and process it in the background.