My system usually runs fine with a heavy CPU load from other VSTs. So i assume it's not my system at fault.
It seems to me that you're trying to cram too much into the software, with the graphics/animations etc, and all the features in the top window. I can't edit anything in the top window without a crash occurring or CPU load skyrocketing.
Why not make it simple but stable instead? Functional not fancy! I couldn't care less how pretty it looks, and how smooth the transitions between screens are. You only need 1 window, 1 sample edit section, and one pattern lane, all visible at the same time. And what's with the picture of the drumkit? Completely pointless waste of space. Technically there's no need for the mixer section if one has control over the parameters on the main controller either.
How about a lite version for using live? Or the option of running as a rewire slave if you can't get the VST stable enough?
I bought this with the intention of using it live, because the step-sequencer and pattern section make it a unique product. And potentially something i would happily recommend to my peers. But there is no way i'd risk taking this into a live situation as it is!
Please please please make a lite version, if nothing else! It has so much potential...
What use are extra features if the machine is unusable!? I'd say start again from scratch, get the basic functions working flawlessly, then see what extras you can add, i.e. FX, extra sequencer lanes, graphics etc. The project browser window is confusing and cumbersome.Strip it down, simplify it, get it stable, then see what can add to make it fancy without compromising the stability!