An idle empty Reaper project with the Reaper window focused gives me about 6% CPU here, 7% when I open the mixer (these are Reaper CPU numbers, activity monitor shows double for reason I explained before).
A fairly normal sized project (~50 tracks) is showing about 19% idle but 55% with the mixer open! That's not even playing stuff back! I never noticed this before because I don't use the mixer but that is a crazy amount of CPU for a program that is sitting totally idle. I don't think I could even mix with the mixer open without running out of CPU.
This is on a 2009 MBP, 2.53ghz Core 2 Duo with 4gb of RAM, running on the notebook itself, not external display, so 1440 x 900
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