I’m a purist. I think you should fix the query before you cache it. But let’s be real: at a certain scale, you must offload the database.

The trick is knowing what to cache. Don't cache the whole user object if you only need their name. And for the love of all things holy, set a TTL (Time to Live). I’ve seen "permanent" caches cause bugs that took days to track down because someone forgot that data actually changes.

The Final Verdict

Optimization isn't a one-and-done task. It’s a constant battle against technical debt. Start with the low-hanging fruit: fix your N+1s, prune your unused indexes, and stop using SELECT .

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