Multithreading on Android

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Well, the trouble with threading is the overhead. Games glitch out if we try to multithread too much. That's why I was always telling people not to expect a quad core to get insane perf with it on.

Right now it's not heavily tuned, it's mostly been made to work and be compatible. That said, it is somewhat optimized already, mainly for the case where games call sceGeListUpdateStallAddr() a lot (like Tales of Eternia.) I'm not sure where the bottleneck is on Android, though.

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