I had the same problems with cpu spikes and what not going on. I notice too that the daw performance meter does not match the windows task manger monitor. However i tryed the new Studio One 5 version and did a little test and compared it to Reaper which we all know runs fairly efficient on cpu load, or so i thought....lol. I did this on my laptop i7 2.4ghz 12ram....ya ya all that ****....anyway i have a little mobile UAC Zoom 2channel interface which i love its sound. Haven't tryed the new Presonus rigs but the older ones where very bright sounding. Zooms have that warm feel to them, i've compared them side by side.... Anyway getting off topic here. I loaded 1 track of MODO drums vst by IK Multimedia on Studio One. I installed one midi bar of a groove and hit loop and let it go. 27%cpu load on the daw and 9% on the windows task manager. Wow does that mean i can only put two more duplicate tracks and i would be *** near at 90%cpu on the daw...Nope, I then duplicated 9 more tracks of the same vst instrument. Modo drums is heavy on cpu so this will give it a good run. i also put my buffer to the max which was over 4000 just to make sure it would play. Well it played all ten tracks no problem....Studio Ones cpu load was 85% and the windows system was at 81%. Conclusion the more you load Studio One the more the meters become equal and it really is using cpu multicores. So don't worry about that stupid meter on the daw so much,just go to work. As far as Reaper, it pretty much ran the tracks the same way, but their performance meter is out to lunch to actual.. it reads low for the most part. So really your system will probably crash before the Daw ever will. The meter was reading 65%cpu load with the ten tracks and windows task was reading 81 to 82% just like the other test. So really Studio one is a much closer representation of actual, once you start really loading it.............And by the way Studio One 5 seems to be really stabble too. I will be buying it for sure now from my 4.6 version.