Speed drop when rotating

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Thing is when i substitute RotateEntity for RotateMesh nothing rotates. Thats why i used RotateMesh in the first place.
Your explanation that every vertex is rotated when using RotateMesh explains the speeddrop. Now i just need to figure out why RotateEntity has no effect in this example.

TurnEntity works nice and quick - thanks.

Now whats wrong with RotateEntity...?

And whats the difference while im at it ;)