Comment 63 for bug 1590590

@blask: Had the same problem. Use the following to decrease speed:

xinput set-prop "AlpsPS/2 ALPS DualPoint Stick" "Device Accel Constant Deceleration" 2

The higher the value (I find 2 good), the slower the speed.

Add the line to $USER_HOME/.xsessionrc to keep the setting across restarts.