游戏状态每秒更新 25 次，因此如果你不在渲染的时候使用插值，帧数也只能以这个速度显示。
The gamestate gets updated 25 times per second, so if you don’t use interpolation in your rendering, frames will also be displayed at this speed.
当您运行游戏，每一帧数据被记录，最后则会显示几百帧的历史。
When you run a game, data is recorded each frame, and the history of the last several hundred frames is displayed.
实际上它指定了在下一帧被显示之前的帧数。
It actually specifies the number of frames before the next trailer frame is drawn.
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