First of all I wanna say that my current 2010 MacBook Air (1,86 GHz 4 GB RAM) was the first Mac Ive ever had and it has been performing well since then, but as everything, it has advantages and disadvantages. One of them is the HD playback. I watch a lot of 720p movies, anime with MKV container (H264+AC3 or AAC) and I have realized that some videos cant be played smoothly on my Air. When a video (specially Animes) have a lot of after effects edition like openings and endings, it lags a lot, and therefore, it drops several frames (my temporal fixes is seeking 10 secs before the time stamp I want it to be played). I tried ifferent players like MPlayer OSX Extended, VLC, Quick Time X, MPlayerX, Movist and the only one who handles properly the subs is MPlayer OSX Extended but it also lags hell more than MPlayer X or Movist so I was wondering if you guys have also this issue, how did you fix it or what player you use for your Anime.