This add-on is no longer maintained here. It is available in the official Blender add-on repo.

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Auto-Render-Tile-Size

Never worry about unecessarily slow render times or having to change tile sizes every time you switch between CPU and GPU rendering again.

Documentation: http://wiki.blender.org/index.php?title=Extensions:2.6/Py/Scripts/Render/Auto_Tile_Size