If I try to play large files which tend to be good quality, say 700MB movie for example (avi), the files do not play properly. The video is smoothe but slow, which causes it to fall behind the audio. This gets worse the longer the video plays. I'm using Mplayer with SiB. I do not run anything else in the background while playing videos. I have checked the CPU usage when videos are playing and it runs at 100% almost constantly until I stop the video and then it drops down to less than 5% I have managed to play some videos smoothly but it's almost always the low quality videos. The videos that I really want to play almost always have video / audio sync issues.