Hi, 
So i flashed Watapon on my zaurus sl-5600 with pxa250 cpu. 
however, it's not faster than the standard SHARP Rom :
Bogomips are the same (397..)
ZJB reports, for Watapon and right, SHARP 
int artimethic : 7,63          vs  7,68
doubl A           1,23          vs  1,2
infinite A         2,71          vs  3,6
Strings           3,47          vs  4,3
Draw              6,65          vs  8,4   
file IO             2,09          vs  9,0
because of the blue crystal them i switched back to the original sharp ROM 
I tried to play a video in mplayer but it seem not going better as with Sharp's rom. 
Never mind, the machine does all i need 
L