Tracks vary. However... nothing should be super CPU intensive. At MOST I have 4 guitar tracks, a bass track, 1-2 vocal tracks. I do use Superior Drummer which take up a lot of RAM.... but I've got 64 gigs and if I disable it completely it only drops me about 20%. I use very few native plugins. Mostly stuff from Izotope... However... I am very aware of using Aux & Buses when possible, I am very aware of not having a million plug-ins going / disabling anything that is not completely necessary. BEST S1 can do on my machine with a session loaded and not even playing or tracking is 50-60% CPU usage. If playing or tracking it is typically 80%-150% and even over 200% if mixing down. I'm running a core i7 2.6 ghz processor with 64 GB of RAM. My internal temperature is OFTEN over 120 degrees after about 5 minutes of IDLE TIME with S1. No other software does this to my machine. I have increased buffer size to the max. I have stripped down my sessions to be as minimal as possible. The only explanation is that S1 is not using CPU cores effecienctly / effectively. I see in the forums where this has been a requested update for many years.