Mowinz, I think, it simply means, that your game is synchronized then with the refresh rate of your monitor to avoid some graphical anomalities.
Happy Hunting! 
__________________
"I cannot but conclude the bulk of your natives to be the
most pernicious race of little odious vermin that nature
ever suffered to crawl upon the surface of the earth."
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Jonathan Swift, Gulliver's Travels (1726)
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