One of my most annoying issues with BIAB is regeneration time.
With any small change I sit and wait and wwwaaaaiiiittt... Life is precious, but I do not feel that when I am just looking at the screen waiting for regeneration to finish. Trying out things, I could make well over 100 changes in one tune that I would want to audition.

Ideally I would want regeneration times to be a fraction what they are now... About 75% faster.

My computer is fast enough smile

Here are some thoughts.
1) Logically, if selective tracks can be frozen and regenerate only "unfrozen" sections should take less time. Or wise versa: re-generate "selected bars"

2)Have a lightweight set of all real tracks, a fraction of the space they take now (lesser quality) for assembling / auditioning thing fast, and when it is time to render go to the source of larger files.

3)Do active re-generations in RAM. I would guess 4-8gb of unused ram should handle this for a single project at a time(~16gb total ram).

4)All things I missed to cut re-generation times.