Complete newbie here, although i have a lot of programming experience...
I'm using Windows 10. Installation went ok, but whenever the genuino is connected to the computer the mouse will freeze for some amount of seconds, start moving again for a second or two, freeze again for a bit, move again for a couple seconds, repeat... When I unplug the board the mouse works normally again.
Is there any easy fix for this problem? Many thanks in advance.
What version of the IDE? Is it 1.6.8? That one has a bug that makes it constantly poll serial ports, about once a second - which sounds suspicious in light of your problem description.
This could be interacting badly with either the board, or the combination of the board and some other serial device, and taking it from a product-breaking bug to a system-breaking bug.
I recommend 1.6.5r5 (or 1.6.7 if you need newer version of the IDE than 1.6.5) - 1.6.5r5 is the last stable reliable one. They're in the middle of a three-version losing streak