(5.4 GB) BEST

So I'm making a 2D game with C# in 64 bit Unity version 5.3 (the same thing happens in 5.4), and Windows task manager is telling me that the editor is using basically all of my free memory (5.4 GB). The editor itself is usable but when I try to test the game it always freezes and crashes everything. Are there any common causes for problems like this?

(5.4 GB)

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