I’m amazed it doesn’t feel snappier. It absolutely should. I have a 17 pro and have not experienced what you’re describing, nor did I when I was running 26 on my 16 Pro.
That said, there’s nothing wrong with the hardware. iOS 26 is buggy as hell and should not have been released. Full stop.
I heard on an apple related podcast I listened to that the hosts had heard from people inside Apple at 26.1 is what they actually wanted to ship and I guess it just didn’t make it in time.