Bob,
BIAB/RB runs fine on any modest machine as long as WINMM is used.
As soon as ASIO is used, BIAB's CPU usage rises abnormally.
My new/old desktop that I got the MB from RHARV goes from 9% CPU with MME to 87% CPU with ASIO.

Now the whole point is; this behaviour is not normal!
There is absolutely no reason why using ASIO instead of WINMM should
need additional CPU power.
These are merely drivers we talk about!Ask Eddie.
Audio drivers and drivers in general, hardly use any CPU power.

Put differently; if you need a 6Core monster machine to run BIAB with
ASIO smoothly
while it runs fine on any machine with WINMM, then there is something
wrong with BIAB.And it runs fine in other programs.

John
ESI Gigaport HD+
Lenovo Turion II /4 Gig Ram/ Win7x64 be
15.6" Monitor
"The only Band is a Real Band"
www.wintertexaninfo.com/BANDS/JohnnyD.php