You'll need to edit "cmdline.txt" to change the mouse polling value.
You have to be careful with editing, that has to be one long line so don't press <ENTER> anywhere while you're editing.
When the editor opens use the right arrow on your keyboard to scroll across the line till the cursor is on the "r" in "rootwait.
Type in the following:
Press space after the "0" so you again have a space before "rootwait". Then press <CTRL> and "x" at the same time, press "y" to confirm the change, then press <ENTER> to save the file. Reboot and you'll have a faster mouse.