My mouse movement periodically becomes choppy/jumpy after maybe an hour of use. The problem goes away temporarily with a reboot, but it returns before long. This seems to happen regardless of RAM usage (I'm always at about 3.25/4.0GB used).
The choppiness is exactly what you'd expect from a Bluetooth mouse that's almost out of battery, but this happens both on my trackpad and on my wired USB mouse. The mouse also works correctly on another laptop.
The computer is just a 2014 Macbook Air, but I don't think it's purely a problem of processing power because I didn't notice this problem until a few weeks ago (possibly after an OS update).