btb needs very long to extract current project

Hi

I'm working on a nice fast, flowing race track for GTR2/Race-Series....but BTB needs very long (about 3 or 4 minutes!) to compile/extract the track to GTR2. Other Tracks are much faster. What do you think is slowing it down?

Big textures? (don't think have any real big ones)
Too much Objects? (have less object as in an other project, which compiles lot faster)
Much Walls?

Thanks for your help :)
 

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