Was having mouse lag in video games with new GTX1070 SC and new i5-8600 CPU. Keyboard actions were fine, but not when moving mouse in-game. Finally gave up and re-installed Windows 10 since my hard drive came from my previous machine. After reloading Windows, reloading motherboard drivers from the disc that came with new motherboard (Gigabyte), and installing video card drivers from EVGA, the problem thankfully went away.