Frame rate（帧速率）： 报告应用程序呈现到屏幕的速率。对于没有动画的应用程序，此值应接近于 0，因为已更新区域优化应避免绘制（除非在必要时才绘制...
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而一个低的帧速率不应该妨碍游戏的更新。
But a slow frame rate shouldn't interfere with the updating of the game. The way to achieve this is by using the following game loop.
帧速率越高，这一步骤耗时就要越少。
The higher the frame-rate, the less time there is to do this work.
这项技术成功实时地实现，帧速率是100到1000每秒。
The trick is to manage to do this in real time, at frame rates of 100 to 1, 000 per second.
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