Freezing in a few places on Verizon Galaxy Nexus for me, too. Login sometimes requires me to force close and restart the app.
When pulling up an itinerary, it very often hangs on the spinner that says loading trip extras. And the app completely crashes when I try to load the upgrade list.
Other minor bug (or maybe I just missed it) - the old used to save checked bag info when you scan the barcode, and the new one doesn't seem to retain it. I have to rescan or reenter the bag # each time.
I do enjoy the presence of new features, especially ability to switch in/out of EC seats via the app. Also like that I can view TSA passenger info to make sure my TT number is attached to a given PNR. But right now it certainly doesn't feel faster at all, and the freezes and crashes have me using a paper BP today...