why there were over 3 arrow in the hidden icon bar

[7code]

I found when I open some video file, like avi, wmv, there was over 3 green colour arrow in the hidden icon, it named as DirectVobSub, is it normal and correct? as the three provide the same option when click it, i didn't like that as it seem made my PC slower and didn't play well, at least I do have such feelings

[Shark007]

If you have no need for subtitles,
you can set 'No Subtitles' on the Config TAB eliminating all green arrows and improving performance.