Is the mouse movement / responsiveness also jerky? If so, it might be that one or more keys are stuck on the keyboard.
Is the mouse movement / responsiveness also jerky? If so, it might be that one or more keys are stuck on the keyboard.
Okay, that eliminates one cause. Only other suggestion I'd have is that it's actually the mouse - many have switchable DPI, for gamers who want to move fast and then switch to fine control for aiming. My trackball has this, and one of its extra buttons switches between high- and low-DPI modes.
Maybe check the manual / FAQ for whatever mouse it is?
You were absolutely right!!
HyperX PulseFire has a tiny button on the mouse which cycles between 5 speed modes.
Thank you!!