You can't really force Java to use up all the memory you give it. It is not the only indicator of performance, and in reality a pretty trivial one if you have 64bit Windows. Java will allocate itself a minimum heap size it is comfortable in if you really did set the maximum heap size to 3MB.
I would look into other aspects of your computer, for example CPU speed, storage devices and most importantly, your graphics card.
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", helvetica, sans-serif">#minecrafthelp Channel Manager, Support Guru, Scrolls Moderator
There are paths of which I must walk alone, for the reward is a companion for the rest of it.
<@Notch> whoa, rude language, behave
<@LG_Legacy> Oh relax notch, I'm never serious >_>
<@Notch> I DON'T CARE!!
@Notch runs away, crying
<@LG_Legacy> I made god cry? o_O"
You need to install OptiFine. You may think that it slows it down more, but you'd be surprised. I have minecraft at 500 Megabytes and it runs 100FPS. I do have a mac, but I don't think that would be contributing much, as they are not meant to be gaming computers
And what about a chunk disappearing near my castle whenever i get away from it a few steps and coming back when I approach it from a certain direction? that's crazy, isn't it? And I have pasted an old backup of that save and there's no problem with that chunk. So i guess the savegame is corrupted. How could I fix it? I've followed several tutorials and haven't come up with a solution!