Roelof1978
Quote: "i'm running out of patience and might just kick the PC"
No..don't do that. Lol

First, is this model a character or some kind of entity?
It looks like a character. Blender is tricky getting the correct export settings just right.
Did you export the FINAL model from Fragmotion? (it's straight forward and simple)
Also, did you assign the vertices to the bones in Blender or Fragmotion?
Quote: "My game is also lagging when I start the game"
Do you mean a "test" run or a Final build?
What version of fpsc are you using? Any mods?
My games never have bugs. They just develop random features..
Lots and lots of random features...