directfb & microxwin ?

did someone tried to use directfb or microxwin on beagleboard
angstrom ?
i just need to know comparation of performance between directfb and
microxwin ?

microxwin is fastest windowing system ?

it seems , they removed client & server arch from standard X

i looked , directfb is drawing on top of hardware directly ?
its performance good ?

i just need to try directfb too ,
to install directfb , i just replace some so files ?