http://docs.godotengine.org/en/3.0/tutorials/3d/fps_tutorial/part_one.html
http://docs.godotengine.org/en/3.0/_downloads/Godot_FPS_Part_1.zip

running that part 1 example code i get following behavior:
https://youtu.be/l2EBvHFPN8c

i first only move the mouse, and camera movement is smooth. then i press d to strafe right and move the mouse at the same time, and the camera movement stutters. is it just me, or?

this is with godot 3.0.6 on linux 4.18.10 with nvidia 410.57 blob.