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If I use the same file multiple times in a Maya scene, but each time I use it it has its own 'file' node, does Maya (Maxwell?) consider that one usage or multiple usages as far as RAM goes?

This is not related to Maxwell plugin. The file node is not only a file name, but also a texture placement information (such as tiling, wrapping, mirror), image controls (invert, brightness, contrast, RGB max, etc), UV channel selection.

You may use a Hypershade editor to link one file node to several inputs if you don't need to change any parameters I mentioned earlier. As for me, this just helps to organise a scene and makes replacing a texture a bit shorter operation. I doubt that extra file nodes should take much RAM so in most cases I just don't bother.

Thanks