In the "Geek techno" section of the updated original post, the last line says there is a way around the 1.5 FPS for kindle DX.
I tried to take a cue from another thread here (
http://www.mobileread.mobi/forums/sh...=148581&page=7), and have multiple updates launched in parallel, each update on its own thread. The gmplay modified by me sent all these requests and got a theoretical frame rate above 1.5 per second, but there was no improvement on the visible output.
So what is *the* approach? I'm willing to spend time coding and reporting results, but I'm stuck for the moment.