I've got an issue when I'm loading it in Nebula ( last version Osx 10,6,8) First it takes a loads of CPu jumping between 2% to 85% without any sound trough. Then when I run sound through, there is loads of drop off. My machine is a macpro late 2006 upgrade with a SSD for the os, then all library is in another internal HD ( 7200ts) , with 16 gb of Ram.
did you use nebula reverb? what are your dspbuffer and rateconvert numbers? when you install or update nebula, then the reverbversion has a very small dspbuffer setting by default, which is in many cases too small for reverbprograms, depends on your machine also. when the samplerate of your project and the nebulaprogram does not match, check if the program is resampled at loading. when not (blinking arrow at the samplerates on the programpage), you have to bring rateconvert up.
maybe you know everything already, but you did not state it in your post.
system 1: windows 8 32 bit - samplitude prox, tracktion6, reaper system 2: mac osx yosemite - reaper(32+64bit), tracktion6(32+64bit)
both systems on: macbook pro (late 2009), core 2 duo 3,06 ghz, 4 gb ram, graphic: nvidia geforce 9600M GT 512 MB