Well, according to ps4, the controller is not the issue for him. So he's seeing something different. That's what I haven't been able to identify.
With the controller issue, it's very important to note that it's only an issue *when the LaunchBox window is active*. It's still an issue I need to solve, but it won't affect CPU performance in games and such, because LaunchBox isn't active, so it's less of an issue than you might think. Still, I did tweak a few things to hopefully help performance with the controllers in the latest betas; let me know if you notice a difference.
Honestly, I think we might be looking at a Windows GDI+ bug, where Windows insists on repainting regions of the display over and over again for no reason. If that's the case, it'll be really hard to solve, but obviously I need to do something.