(1) Hmm, you should download Good Guardians from Galaxy Store, after it's downloaded, open it and and run Galaxy App Booster. This fixes extra cpu usage.(2) You should also go to storage settings and make it show system apps, find "Google Play Servic...

I don't use Galaxy S23 Ultra, but I faced the similar problem on my phone. Generally speaking, you said that your phone recently got updated to 8.5 right? That "recently" is the cause, since you just updated the phone, it takes some time to adapt to ...