How much is this still a problem in a multicore world? I guess I assume my UI is being managed by a separate process on a separate core most of the time, and an

How much is this still a problem in a multicore world? I guess I assume my UI is being managed by a separate process on a separate core most of the time, and any userspace stuff that is demanding CPU will just be thrown onto another core. I guess one issue is that you might end up with a single core dedicated to UI so not running at full utilisation, taking advantage of threading?