Out of curiosity, have you tried anything other than VirtualBox (e.g. VMware Fusion)?
I was happy with VirtualBox's (on OS X) performance until I bought VMware Fusion. I didn't do any benchmarks so I don't have numbers to back up my claim but it definitely "felt" much faster than VirtualBox.
I was happy with VirtualBox's (on OS X) performance until I bought VMware Fusion. I didn't do any benchmarks so I don't have numbers to back up my claim but it definitely "felt" much faster than VirtualBox.