You can boost the priority of BIAB as follows:
a) CTL-ALT-DEL and select "Start Task Manager"
b) Select "Processes" tab
c) Right click the BIAB process (don't know the name)
d) In the pop-up window, Move the cursor over "Set Priority" and then click on "Above Normal"

I do this with another program I have and don't have any problems. Not sure about boosting it higher, though.

Use at your own risk!! smile