after i deactivated apple beta updates in my iPhone 13 mini with ios 17 beta, it became increasingly better performance. it was extremy laggy and draining battery.
i suggest to deactivate apple beta updates
Yes, and? Beta builds include processes and diagnostics running in the background. You should expect them to be buggy and a bit slower than usual.
You shouldn't install them on your primary device, just devices you can use for testing.