Two potential problems?

[Cosmic]

Wow... That's quite the spikes you were getting there!

 

[Deceptor]

Glad you've found the root cause Webbstre, the cpu difference is black and white

 

[Trekkan]

I use VW as well (although barely at the moment) and I reported this issue on their support forum. Not sure if I'm having the same problem, but I think I might be. Anyway, I used your link to your graph (hope you don't mind, let me know if you do and I'll remove it) as I couldn't link to this thread as it's in the pro forum.