Mission is too resource intensive

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The first mission start is defined by random integers.
Apparently there's too much of it going on so each loop takes ~6.9ms/17 Frames to complete.

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This persists also after having done the first mission :c

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Note to self: Try drawing the markers every n frames, where n is the number of frames where no flickering is visible.

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Another approach could be only drawing the markers if the player is in the approximate area.

The only question is if checking the player location relative to all the marker locations would be less performance hungry than just drawing all the markers...