FWIW, after a few years of recording ..
The image below is my current recording system drive set up. I show only hard drives in the image (external drives for backups excluded).

C: drive - OS and VST/VSTi plugins and BB/RB
E: drive - Realtracks
F: drive - used to write incoming audio (more important as you add multiple incoming audio tracks)

These settings provide very quick results.
If you can, I suggest realtracks get read from their own internal drive .. and the audio input writes to its own drive. The audio (input) writing drive tip increases the efficiency/reliability of almost any recording software.
Reason being; if a system is not trying to read and write to the same drive at the same time it runs better.
Processors are rarely the problem, the bottleneck usually occurs with drives. RAM can alleviate this to an extent, maybe sufficiently for many, but the inevitable bottleneck IMHO is the drives. Spread the load if possible.

Just thought I'd throw that out there.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
homeScreen2.jpg (33.01 KB, 36 downloads)
I do not work here, but the benefits are still awesome
Make your sound your own!