I am using a Logitech mouse (wireless but not using Bluetooth but some proprietary technology and a USB-2 dongle) and I am observing very annoying frequent (i.e. every few seconds) and sometimes longish phases (up to several seconds!), where the mouse is not following the hand movement. This seems to have to do with the down-stream USB ports not being properly polled! I noted, that these drop-outs are worst, when I attach the dongle to an external USB-2 hub attached to the SP3 docking station. It is a bit better, when attaching the dongle directly to one of the USB-2 ports of the docking station (but still annoying enough to not really be usable) and only when I attach the dongle to one of the USB-3 ports (on the docking station or the USB-3 port on the SP3 itself), then the mouse behavior is acceptable. Can it really be, that the SP3 USB driver is not able to poll a USB chain fast enough to allow a mouse being attached via an external USB hub (i.e. SP3 -> USB-2 port in docking station -> external USB-2 hub -> Mouse dongle)? With my former laptop that was absolutely no issue and I had all my devices at home (mouse, printer, scanner, etc.) all attached to said external hub, so that I only needed to insert a single USB connection to be all hooked up. M.