I got a 4K (3840x2160) display, and haven't been happy with the mouse functionality in Linux. It feels aesthetically laggy / choppy, and functionally, slower to navigate. Has anyone spent time tuning velocity, acceleration, etc. on Linux for high resolution displays?
I don't believe input delay is all of the problem for me, at least not all of the problem. I'm using a GeForce 650 GTX, which is more than capable of driving the display, and the refresh rate is 30 Hz, the same as I've used for other displays. Text appearance when typing, etc. doesn't seem laggy.
My current settings are (KDE mouse module): 8x acceleration and 6 pixels pointer threshold. I guess "pointer trails" are a thing of the past (from Microsoft Windows as I recall), but I kind of feel like with this display, they'd be nice.