Can Macs (w/ OS X obviously) handle dual monitors without any slowdowns? I have noticed that when I run my Macbook Pro mid-2010 i7 with a 24" external, my Expose animations (amongst other things) are slowed down. It's not super, unbearable lag but its significant and noticeable (a little stronger than using the Intel graphics card over the Nvidia). If I repeatedly initiate Expose 5-6 times, it will become smooth like I'm just using the single laptop screen. Why does this occur? Is this a limitation of Macs (my old laptop didn't have this problem, but it was running Linux, so I'm not sure if that affects anything) or is it something that only I am experiencing? Another interesting revelation is if I disable BeamSync, the animations become a lot smoother with dual monitors (I don't really notice a difference with just the single monitor). Unfortunately, the tearing that occurs is just too much of an issue. But once again, it makes me wonder if its a hardware limitation or just OS X's mediocre ability to handle graphics with dual monitors. Once again, the Expose lag for example is not enormously gigantic or anything, but it is definitely significant and very noticeable. It is choppy enough that I don't use my second monitor anymore.