I just started having this problem on my server where if I look around normally its fine but once I get into a vehicle its like the dpi increased by 1000 is there a way to fix this?
What game-mode is it?
Vehicle control is 100% serverside with no clientside prediction or compensation ( Try to walk through a model which is solid on the server but walk-through on the client; you’ll jitter while not in the vehicle but in the vehicle it doesn’t ).
If you have a HUD which runs when you’re in the vehicle, you may be creating fonts, or calling Material inside of the HUD ( memory leak ).
Give us more to go on. Addons, etc…