I didn't have time to do much optimization. All I could do was occlusion culling. I have a pretty beefy CPU so I didn't find any lag. If you think the camera is too hard to control, you can press left arrow or right arrow to override the camera direction. (For example I am turning left, my camera would also face left but if I press right arrow, it will force the camera to face right.) You can hold one arrow key throughout the gameplay if you want to keep your camera stable