When I compare it to Mplayer WW (my current player) it uses 2x - 3x more memory. And roughly 2x more cpu power. Keep up the work.
MPlayer-WW is an excellent project but is a fork of MPlayer that uses direct-x codecs instead of the build-in libav codec, so on the up side it does not have the overhead of Qt but on the down side it's bare bones meaning that it has a limited codec library and has no features like UMP does. Again, an excellent project but it's like comparing apples to oranges :-)