David, Dan got me thinking about the MIDI only option so I did some experimentation. Would you verify this method for me.

1-Load the VSTi with a MIDI song
2-Under generate/custom click on all pages (MIDI only)

I am using BiaB 2021 and when I do the above the generation is almost simultaneously. Also only the tracks' mid files are saved in C:/bb/bbplugin. No audio tracks were generated. This is a game changer for me.

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Life is short so make sure you spend as much time as possible on the Internet arguing with strangers.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware