[Eric Lambert]

I'll be using 2019.5, so core distribution is much improved over previous versions. I do know that single-core operations will be slower on the 12-core due to its clock speed, but most of the apps I use employ all cores.

I do use Vienna but it's never pressed my CPU too hard, and I'm 99% certain that it uses all cores (there are preference settings related to this). Plugins that do eat CPU are u-He products, Output's Arcade (terribly buggy, especially when taxing the CPU), and of course some of the modern reverbs.