The removal of objects in low geometry levels is not consistently working in 1.4, and probably in several previous versions. The easiest test is to launch Black Forest in the lowest geometry detail. If trees are there, the game is bugged. It does sometimes work, and I'm not sure why.

This option provides a massive FPS boost, and since it can technically be used in other 1.x versions if the game cooperate, it will also be present in 1.5, but fixed to consistently work.

It is impossible to collide with track objects that get removed, which affects gameplay on some tracks. Although I'm not aware of tracks where it helps to get the record, it at least makes it easier to get a better time on some tracks.