One interesting thing I noticed tonight. It takes forever to load flight details within a PNR (and therefore get to seat map, gate info, etc). However after I've waited out for one to load, going into another PNR loads very quickly. It's almost as if the long loading time is because the app is trying to load data for all PNRs at once which is what's taking so long.
Of course, the data doesn't stay cached after you close out of the app...so you have to rinse and repeat every time.