Assortment of issues after latest OTA update.

Just thought I'd report in. Got the new phone last week. No dead spots, but, it's very jittery and laggy when I first unlock it and when returning to the home screen from an app; Quiet Time works properly most of the time, but not all the time; and my battery life sucks. I don't think it's related to any apps, as I have only installed the bare minimum at this point; just haven't had time to fully load everything that was on my old phone. Something is keeping my RAM nearly red-lined all the time; can't figure out what it is yet. Really don't want to do another FDR, and not sure what the point would be with a "new" phone that came to me completely blank. Just wish they could have left well enough alone. May fiddle with it a bit more on the weekend.