Below is what I posted yesterday but PGM deleted it.
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I have used most of the top DAWs. And Realband is not even remotely close to being in the same league as the top DAWs. Plain and simple. It is incredibly sluggish with an awful GUI. It suffers from much of the BIAB excessive dialog window disease. I know this will sound harsh but it looks and feels like a prototype of a DAW that was never finished.

Just add true inline regeneration and/or add freeze bars selectively in BIAB. Then clean up the BIAB GUI and let Realband become a legacy product that its few hardcore fans can use to their hearts content while the rest of us finish our projects in a modern DAW.