I'm sorry Craig, I'm going to have to disagree with you

. I run a desktop system and a laptop, both with a 32 bit system install of windows, and the available RAM is around 3.4GB with windows10 installed (I am truly amazed by Windows10 the more I use it). Both systems wake up like they've have a double shot coffee every morning and Sonar has very few issues unless I try to add too many DSP's.
Only last month I finished a song that had several takes of electronic drums, keyboard, bass and guitar. It had 4 vocalists that had over 12 separate takes on two of those vocals. So, a total of over 30 tracks with EQ, compression and reverb on most of those. There is also DSP on the busses, including the master. I run a Roland OctaCapture and often use up to 6 inputs when recording acoustic piano and vocals together. The OctaCapture has it's own reverb which doesn't get printed to the track when recording.
How Sonar performs is almost entirely up to the setup of the computer system and Sonar itself. It can take some time to get your computer functioning well with any large, sophisticated software environment, but when you do, it should give you hours of trouble free use. I have no doubt the OP is pulling his hair out with an issue that has at some stage plagued many of us, but with a little help and some experimentation I'm sure they can achieve a stress free recording environment. I hope they can use some of the great ideas put forward here and end up with a system that serves them well.