The shell on my vagrant box is incredibly slow, atleast at some things. For instance, if I press enter with nothing typed in, it takes about 3-5 seconds for it to be ready to take another command. This should be 0 to nearly 0 on most machines.
This is my second vagrant box after my first one was rendered unusable somehow (i forget) and I had to recreate it. However I dont remember it being this slow.
When I hit enter I can see 1 of my CPUs hit or come close to 100% and then come down before it is ready to accept input.
Disclaimer, I am using a P4 so I dont expect it to be super snappy but I expect it to be 80-90% of the host OS (Linux Mint 15) which it is not able to maintain.