Hmm, I'm using the GINGE-bundled one I guess (the .PND from http://dl.openhandhelds.org/cgi-bin/pandora.cgi?0,0,0,0,71,224). So you're saying that it will run better if I run it via GINGE manually? I will give that a shot today.
I also noticed that the clock speed is set at 150MHz within GPFCE...