I only use it for Whatsapp, bathroom break HN and a few calls a week. Everything else I do from my PC. Also, performance is great for me, I'm not planning on running games or k8s on my mobile.
EDIT: looks like you're talking about the 13 mini, I got the 12 mini, which IIRC has similar battery life complaints. Not sure if it got worse with the latest iteration.
I've never heard anyone complain about the performance of the 13 mini before, maybe there's something funky going on with the OP's phone.
That being said, I also play golf and use a Golf GPS tracker, Pokemon Go, and social media most of the day. Coming from an iPhone 11 Pro which had incredible battery life, it is a major change. BUT, the lower battery life is manageable. I have external battery packs, I prepare for these types of things. I can make it last when I need it to.