[linzki]

I had same problem that this threads starter has. Problem was with subtitles, namely .sub subtitles.

I used subtitle workshop to open that .sub file and saved it as subrip file (.srt) now it takes only about 50% of my cpu time and video and sound works perfectly.

i've tried about every codec that there is and it didn't help, just this little tweak with subtitles worked. I think this works with every mkv codec (haali, or core av...)