Hi, I've tried several USB3 hubs from different vendors and had complete slowdowns (but not beachballs) when using them. This is most noticible when I'm moving my mouse around, which either freezes or doesn't register a mouseclick the first time. If I remove the hub, activity returns to normal. Currently using a J-Tech Digital 4-port USB3 (powered) with a Logitech cordless mouse (unified receiver), and the standard Apple bluetooth keyboard. Any ideas on the cause?