Overhead ms
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This is designed to compensate for slow user interfaces or slow internet connections, where a fraction of a second can be lost in the processing and transferring of information back and forth from the engine to the interface or interface to a chess server.  The value is in milliseconds (1/1000th of a second) and acts as a safety margin.  This should probably be left alone unless you see the program starting to forfeit games due to exhausting its time. If you see such time forfeits, increase this value. The default is 50. For internet play where lag is an issue a value of 100 is a good first try, but may have to go higher if you see time losses. For games with fairly long time controls, 75 is a good value for general use just to be safe since the lost time will not be noticeable at these levels.

Time Usage
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This provides the ability to manipulate Dragon’s time control heuristics, to make it allocate time more quickly or less quickly.  The default is 0 which is what we believe is the ideal setting but remains to be tested at longer time controls.  You can make it play faster (use less time) by using a negative number or you can make it allocate time more aggressively by setting it to a positive value.  The range of values is between -90 and +90.  It's very unlikely extreme values will play well, so we suggest experimenting with relatively modest changes to the default. The ideal value may depend on the time limit. A slightly more negative value may be optimum for online play where lag is an issue, and is also suggested for play against humans. A value of -90 (meaning that it will try to use 90% less time than it normally would use on each move) is quite appropriate for human games, since even with using just 10% of the opponent’s time Dragon will be vastly stronger than any human player.