Mine use's a average of 63,000Mb.Nothing to worry about if you need more ram just get some how much you runing with.If you dont no.Here is how you find out.Go to.
My Computer>Right click below all of your devices than click properties and it will tell you at the bottom.If you need to no where to get some ram i can tell where to get some.

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System details - Help us help you > Provide these details when you post !

Fixes For Limewire When LW Isn't Operating As It Should
If you've updated LW and can't find your downloads!
LimeWire FAQ and User Guide--If LimeWire Will Not Load
If Limewire Will Not Connect

System Mechanic--FileHippo--Download.com

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Some time's i just want to throw my computer out the window