Could be trouble with that speed, but it's hard to compare. On a AMD 1200Mhz it was a disaster. Now I'm running it on a G5 dual 2,5Mhz and it runs very smooth. I recently switched to Kontakt 2 to maintain my complete library. Even if I spend 3GB memory in diffrent kontakt multi-instruments I can still record in realtime. Storm Drum is really great if you have little time to do a project. The premade loops are awesome though all a bit dramatic :) Hope that helps.