图形驱动程序排队的最大帧数。
图形驱动程序可以对要渲染的帧进行队列处理。当 CPU 的工作明显少于显卡时，
该队列可能会变得相当大。在这种情况下，
用户的输入将“落后于”屏幕上的内容。
使用 QualitySettings.maxQueuedFrames 可限制排队的最大帧数。在 PC 上，默认值为 2，
可在帧延迟和帧率之间达到最佳平衡。
注意，可以将 maxQueuedFrames 的值设置为较小的值以减少输入延迟，因为此时 CPU 将等待显卡完成前一帧的渲染。但这样做有一个缺点 - 可能导致帧率下降。
Currently maxQueuedFrames is implemented in Direct3D 11, Direct3D 12 and NVN graphics APIs; it will be ignored by other graphics API.
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