I've been playing with it for a while now and I still get cpu spikes that cause pops in the audio. I have 569 gb available on a 640 gb system drive. The eastwest samples are on the hard drive they supplied. (complete composer's collection drive = 1 tb). I have 6 gb of ram. When I load an EastWest Pianos master patch (the biggest) I still have 4 gb of ram inactive. The cpu spikes occur with heavy playing and seem to be random. They even occur with lighter playing and appear randomly. I have experienced this problem at 128 and 256 buffer sizes. The EW Piano master patches sound fantastic as they include up to 3 mic positions (I've only used 2) so they are really heavy duty, but then again my machine is heavy duty isn't it? Mac pro 8 core 2.26, 6 gb ram Logic Pro 8. I Have gone to other message boards as well and there seems to be a bunch of people with the same problem with EastWest Play sample libraries. Rounik, My Logic cpu meter only shows 8 cores although it looks to have room for 16. I am only getting 8 (actual core) threads as far as I know. On the activity monitor cpu usage window I show 16 slots but my system is using every other slot, for a total of 8 cores. When I play the EastWest pianos the cpu usage window shows minimal activity, even when popping occurs. the logic cpu meter goes into the red. How are these two different?