Yes, that is what I also experienced with the GUI. Try to run the MPlayer binary itself. In MPlayer OSX Extended, you can find it here: /Applications/MPlaye

Yes, that is what I also experienced with the GUI. Try to run the MPlayer binary itself. In MPlayer OSX Extended, you can find it here: /Applications/MPlayer OSX Extended.app/Contents/Resources/Binaries/mpextended.mpBinaries/Contents/mpextended.mpBinaries/Contents/MacOS/mplayer Just give it any video as parameter. And I really wonder why the difference is so immense. Maybe the MPlayer OSX Extended GUI totally sucks. But all the other GUIs I have tried seem also to suck performance-wise or with other problems.