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The size of the map depends on the size of the file. It is possible to make a map in FWE that is too big for the grid.
I am working on finding the optimum size for the map, big enough for good resolution, but small enough to fit the grid and also to not overload the processor. A 12 meg map in Skwyre makes everything slow. The resolution is incredible. Sometimes the beautiful image may be worth the slower speed. (This is subjective, of course, not a glitch by any means.