ok so in mc java, if you move your mouse really fast to one side, your camera sort of slides to that side, instead of going there at the speed you moved your mouse. how do u fix that?
This is probably die to the cinematic camera setting. To disable it: Open settings. Navigate to controls. Scroll down a bit and there should be a keybond called "Toggle cinematic camera's so make note of that. Then leave settings and click whatever button is bound to do that.
That works, or you may need to adjust your mouse sensitivity under "controls" in the settings menu. If you're using a gaming mouse, it's possible you turned the DPI up way too high, but you'd probably know if that were the case.
Might of accidentally messed with your dpi on your mouse click down your scroll button a couple times
