I find my 2012 Macbook Pro to be a decent Renoise driver, even with a fair amount of plugins. I do find that the CPU can get taxed when a ton of plugins are running simultaneously though. Still, it does impressively well.
Do you use a laptop for Renoise? If so, what kind? If not, what type of desktop hardware are you rocking these days?
I'm considering a new mobile device for Renoise as well. I wonder if I need to focus more on RAM or CPU to handle heavy Renoise stuff. Probably a blend of both.