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The shortest build time is achieved by marking Test Map and Preview simultaneously.
Levels should be compiled with Preview during development, and without Preview for the final version. Each printed dot in the portals and the visibility calculation means 20 portals, so you can see how much dots will still be needed. The time per dot can't be easily predicted, though, and will be much larger for the last than for the first dots. If you have a very large level, but don't have the time for final compilation, compile with Preview off, but Test Map on.

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