While Mentalist got point here, I also can't disagree, that minecraft is horribly unoptimized. Of course, comparing it to Duke Nuken is far too stretched, but - putting random numbers of course - I think that resource usage should be 3-4 times lower than current one.

I must admit - I'm not Minecraft player/fan, but I was interested in the project as curiosity (mainly, infinite world generator). For using on N900, i also strongly recommend trying (Open Source!) unofficial servers. Most of the time, what Minecraft offer officially, is worst version possible, compared to modified/rewritten ones. Basically, Minecraft created got "fame" of being hard-head one, not very cooperative on including ideas/optimizations/fixes by other people (thus, so many forks/rewrites).

I got strange feeling, that - using alternate servers - it's possible to host quite effective server on N900 Still, it's rather a curiosity. It's pity, that OpenGLES port isn't possible (for now).

/Estel