Eee PC MKV play performance

I have an Asus EeePC 1000H and i use it mostly for watching movies. I have some problems playing MKV video files without the AC plugged in with GOM player with its standard codecs, so i installed aditional codecs. (just google MKV codec) and hit the first link)
The result was acceptable, no more frame freeze/skip , but still there are some sync problmes with the audio/video track.
Hope someone else finds this usefull.