Ubuntu is very slow on esxi5

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http://serverfault.com – I have installed ubuntu 12.04 32bit on Vmware esxi 5 update 1. The virtual machine is: 2 core, 4 GB RAM, 64 MB VGA. Still the vm is very very slow (with and without the vmware tools) . What could be causing this? Thank you. update 1: I didn't write the specs of the server since it is really powerful, and not really doing a lot currently, all other machines (some windows and some linux redhat) work great. By slow, I mean everything is slow, login, any UI action, anything I do is slow. Moving the mouse is slow, right click takes about 5 secs to appear. Except that booting is really fast. (HowTos)