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1b1ed1a
(Get the code!)
I am not exactly sure if I have the same problem, but it sounds very much like it.
Since I reinstalled my machine with Ubuntu 13.04, VirtualBox became almost unusable for me.
Whenever I start a machine (or when I restore a saved machine) the load of the host machine gets extremely high (> 30) and the machine reacts very slow, if at all.
I tried this with VirtualBox 4.2 as well as 4.1.
I am next going to run memtest to find out if the memory is corrupt, however this would be surprising as the problem never happened before I switched to Ubuntu 13.04...