Media player S&T performance improvement

[_samui]

If you open a gazillion video files, framedropping occurs. For some reason even the focused media player doesn't boost it's priority so it lags as horribly as the other.

For some strange reason when I open 20 videos and stack them, some of them run on normal speed when others lag many seconds. Maybe taking a look at the priority of the focused video would give a clue about what is happening.

I think that in a stacked situation you might as well drop the priorities of video decoding on the non-focused videos because they cannot be seen anyways.