Wendy,
Perhaps a different culprit is to blame. I know that a big draw for Pro was multi-threaded processing and that's still a favorite part of the software. When I was using a labeling scheme for a large number of features (17k+) with Maplex enabled by default, I saw my performance take a big hit. Pro begins to lag to the point where if I click anywhere I sit and need to sit and wait for the response to my click (selecting a feature, pan, etc.). But, because labeling does take a place on a separate thread, it's possible there is another culprit. I will dig into this further on my end. I do really like Pro. I think with some time and development it can be the hallmark of Esri's products - which I imagine is the plan anyway.
