I have a MacBook Air and I want to connect two monitors to it (not Thunderbolt Displays). I was thinking about using a Mini DisplayPort to DVI adapter to connect one monitor and a USB to DVI adapter to connect the other (such as Diamond BVU). But I have heard that this causes it to become slightly slow to respond on Mission Control and causes videos to lag. Is there anyway to connect two monitors without the lag? Or should I just use one monitor?