Very laggy problem :/

[jens]

1. Spawning objects. When I enter some rooms (for example fuse room on level 9) I can't see a floor, but it appears some time after with some big objects, but small ones doesn't appear at all.

Did you use a save to play level09? If so then yes I can imagine this sort of problem could appear. If not could you give some more information on how you played for this to occur?