Slow Movement

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I've noticed in some games I've played, the ship movement is executed verrrrryyy slllooowly, with a full second pause between each movement point. In other games, ship movement is very rapid, and five ships can all execute their movement in a blink of the eye.

Anyone know what causes this, and how I can make sure the rapid movement is always active? The slow movement is great for strategic purposes, but it really slows down the game.

Thanks!