Rofl well good for you.. I'm not sure what your OS preference has to do with allocating RAM etc and minecraft play, buy hey - It's super that NOW we know what you prefer to play on.
(FTR - I like playing on systems I can design and build myself, carefully picking EACH and every piece as I choose and not be stuck with a limited selected by ANY vendor, be it Apple, Dell, etc).
The reason I suggested something like Magic Launcher - which works with ANY of the three OS's minecraft supports - is because you can easily configure settings like RAM very easily. You can also set up your own ".minecraft" folder anywhere and have it use that as any one of a limitless amount of options/mod settings etc.. But again - The big reason I suggested it was because it works with all OS's, and will allow the OP to adjust the allocated amount of RAM.