When should you bother with caching complexity?

hey everyone, i've been thinking about caching a lot lately. we could add it in a few spots, but it definitely makes the system more complicated. on the one hand, reads get way faster. but on the other hand, making sure the cache is up-to-date is a real pain, and just managing the cache itself takes more work. has anyone else run into a situation where the speed boost from caching was way more important than the extra hassle and potential problems. what made you decide it was worth it