Well, my problem appears to be the following: Every time I start a Youtube video Safari starts to lag like hell and is almost paralyzed until the video is finished loading. As far as I've noticed, this appears only on youtube, and neither updating Safari nor Flash Player helped. This started to happen for about 1-2 Weeks i guess, and I've used Firefox in hope it would disappear by itself or get patched, but now it is just annoying and i really have no clue what the cause could be. Did anyone of you experience similar problems or knows a fix? I'm using a Macbook Air Mid 2011 in case it's important.