Solved Mouse stutter/lag when processes using high cpu.

[jr2]

Old post but for the sake of posterity, I'm surprised no one mentioned bumping up "Windows Explorer" process(es) to High Priority in Task Manager; it definitely has an effect on mouse cursor movement. When I'm running something (or a couple of somethings) that I've assigned High Priority to, I also get the lagging, stuttering mouse cursor effect, as if the batteries in the mouse are low, when I know they're not . . . in those instances boosting Windows Explorer process(es) to High Priority does the trick, without having to lower the priority/priorities of the app(s) running in High Priority.

System in question is an i5-4690 on an H97 board, running Windows 7 Pro 64-bit w/8  GB of memory.

Came here to say that as a user running an i5-6500 and 16GB RAM, running Windows 10 Pro from a Samsung 860 EVO, I appreciate this post. I was trying to figure out what process handled the mouse pointer so it would quit bogging down when loading multiple things at once, and this post did that. Although for whatever reason explorer.exe doesn't show up in Win 10 Task Manager and I had to use SysInternals Process Explorer to set the priority for explorer.exe