First.. why is there 2 wineservers running? something looks like it might not be working correctly... When its running Idle... VirutalBox has some ways to try to cut down CPU usage since its handling everything and not the main OS. When you start running a program hard in VirtualBox and in Wine it won't be much different... VirtualBox is also going to be using your virtualization support on your CPU. Try getting top going where you can see it and have VB in a window, making it the active app and start using it and see where the CPU numbers go. Also look at your memory usage there and see which one is eating up all the ram.
