Fix trackpad lag in ubuntu

from: http://askubuntu.com/questions/203294/ubuntu-12-04-1-and-12-10-usb-mouse-and-touchpad-lag

In 10.04.4, it helped to modify the touchpad's properties by synclient SingleTapTimeout=0 andsynclient FastTaps=1 in the Terminal.

You can see all settings with synclient -l.