Possible Cause for the FPS Problem

I've been noticing some patterns in the low FPS problem concerning version 0.5. Personally, my FPS drops when I spawn a vehicle with a turbo. If I remove the turbo with the parts editor, I see no difference. It will drop to <40 FPS and stay there. I tested this turbo idea on the sunburst. Second, I remember using EVGA Precision to manage the GPU temp while playing Beam.NG and I could easily tell that the card was under load while playing the game. The core temperature would rise, I could hear the fans, and the card would raise the clock speed. Post updating, it's as if the game isn't running and the card stays in a near idle state. Perhaps these observations could help to diagnose the larger problem.​