Ooh, this is actually a really attractive option, thanks for the idea. How much is the speed decrease? Is it enough to be noticeable? And how much does the battery life decrease by? Thanks!
With a SSD on the host OS, I really can't tell much of a difference.
Not sure on the battery life, but I've had nothing to complain about as long as I'm careful not to have some random process hogging 100% CPU on either guest or host.