What is cheaper in terms of performance?

[Yue]

It is cheaper to create a level on the basis of brushs, or to load meshes created in external programs. This initially because I have performance problems really worrying, but is more for my computer system and I do not want to give up shadow effects and things like that, if not see if it is really feasible to create levels based on blocks, spheres and so on.

[Thirsty Panther]

From memory Josh said there was no difference.

Ah here it is.