I was trying a Toshiba Satellite - L855-S5155 and I found an strange behavior on Windows 8. Every time I made a ctrl+"any key" combination, the mouse takes some extra millisecond to respond.
So ctrl+c, ctrl+v and ctrl+z which is very common, freezes for a little while the mouse cursor.
I decided to update the Synaptics Touchpad driver from 18.104.22.168 to version 22.214.171.124. It seems to fix this problem for the moment.