I'm using currently Ubuntu 12.04 LTS as a host machine, and I've virtualized three machines:
- a Xubuntu 12.04 guest
- a Windows 7 guest
- a Ubuntu 12.10 guest
All the guests have the same VirtualBox default settings, but Ubuntu 12.10 is slower!
The installation took 1h 40 min! (Normally, it takes 40 minutes.) Now it is impossible to use it, and all operations are very, very slow.
I'm using VirtualBox version 4.2.4.
Why is it slow? And how can I make it faster?