I don't know if you would consider it tuning, but a low latency kernel is a massive UX improvement on consumer devices, where you don't want the UI to stutter a

I don't know if you would consider it tuning, but a low latency kernel is a massive UX improvement on consumer devices, where you don't want the UI to stutter and lock up under heavy load, and don't mind paying (could be wrong, top of my head) like a 5% throughout penalty.