sudden jumps in ram usage

I am using 2.62. I am using this version because the Maxwall Render add-on is not ready for 2.63. I am working along and my ram usage says 6 gb…then all of a sudden while I am just working along, moving copying objects…not rendering…working in solid mode. The ram usage on blender will jump to 15 to 17 gb. I have 20 GB on my machine. Then if I stop working on it, after awhile it will go back down to 6 gb…Is this a memory leak?

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