I am pretty sure, this is just a fancy freeze Feature. “Pre-Freezing” your tracks when CPU power is available and then quickly change to the freeze version and reduce the buffer size when you monitor.
The biggest problem in implementing this would probably be, that Bitwig needs to reload the audio engine once the Buffer Size is changed, not allowing for a smooth quick transition.
I don’t know why that is the case, but I fear it’s some logic deep down that can not be changed quickly.
See my thread here:
Is reloading after changing Buffer Size neccesarry? - Brainstorm - Bitwish