There is a function that I was referred to which is at least faster on the creator's machine:
http://blog.alladvanced.net/2011/02/21/square-root-calculation-speed-in-flash-and-unity3d/
which I figured out from a question of mine on the forums here: http://forum.unity3d.com/threads/147661-Square-Root-runs-1000-times-in-0.01ms
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