choppy video when upgraded to alpha 3

[rikardo1979]

OK, so now I know what you are about after tested your file.
There is something really odd in this file and the subtitles really affect the playback badly
To be honest I havent seen the mkv file with the subtitles coded in somehow, which you can turn on/off ...
To be honest I don't know why is this file having a problem with the playback as its not even having a high bit rate.

But I may have an idea how to solve this, even is a bit workaround

Try to not used the build in subtitles but download the subtitles from any source out there, in .txt or .srt format and try if that work.
This should work, im pretty sure but lets try it and post back. The file plays fine with built in subtitles off so this make me think that it will play fine with external subtitles.
I know its not ideal but it may work for you