Install classic gnome desktop in ubuntu 13.04

I hate unity deskop performance after installing ubuntu 13.04 in my notebook. It is so slow.
So, I install classic gnome into my ubuntu with a simple command in terminal

sudo apt-get install gnome-session-fallback

and then reboot your computer. You can select GNOME Fallback or GNOME Fallback (No Effects) to use gnome classic desktop.

Enjoy for your desktop now :)