The rendering speed is now the same as Biab Audio > Export Song As wav files...
It is a touch faster than RealBand.
Biab renders the tracks to RAM as it's playing, it could be done this way with the Plugin's bbw4 (it could load the tracks direct to RAM and would need to send audio play/sync to the Plugin) but you would still need to render the tracks from RAM to wav then drag in the DAW.
Adar is making great steps in the programming of the Plugin.