didn't think that ever be on here again after I got ri of my dell, but my macbook pro has been suffering from some serious lag lately! i don't know where to even begin. i thought i was a problem with my internet so i upped my comcast speed from 25mbps to 50mbps. then i wasn't getting close to reaching 50 mbps so i changed my router from a linksys e4200 to an asus n66u. so now that i've changed everything that i thought could be the problem and my computer still has internet lag and general lag when i change from application to application. i'm handing it over to the experts. help!!!