Take my word for it, that's not a problem. You don't want movies over 15 fps anyway for your GP32. It wastes space, and the LCD screen compensates for the lower fps.
And when your screen "turns gray and there is a lot of text and stuff", it means the GP32 has crashed. It's the GP32 equivalent of the Windows "blue screen of death"
I can manage to go up to 25 fps but only with 16/9 movies
it depend on the data rate in fact so in order to improve fps you have to reduce bitrate...
with 64kbps (divx 4.12) you can have more than 15fps
That is very odd. Mine seems to be able to handle playing 200kbs with 20fps with divx. I run it at 166mhz though. I never tried using Xvid, is it that much better? Cause what I have seems perfect enough for me... :unsure: