Do the particle simulations generally run on GPU or CPU?

A bit of both, actually. I think they are starting to go towards the GPU because it's just better. Before, we were primarily CPU, but now we've got a lot of stuff on the GPU, so we're taking a bit of stress off the CPU. It just means we can add more particles.

Right, and I know a lot of the prep work for Vulkan will help with that as well.

I think a few of our artists can actually finally crank up those particle counts and a lot of curl noise, one in particular.