It just makes each heap size larger. which sucks for devices like ours with 256mb of ram...
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yeah... we have 256mb of ram and the dx has 512. they have double the ram and double the heap size, i really dont see why people think the bigger the better, im sure thats not the case.
IMO i would keep it at 24m
vm heap size just allows the jvm to have larger heap sizes, as far as multitasking it hurts performance with a device on lower memory like the d1. but its better if you're only running one app... which is never the case.