0 is basically an invalid setting (or may switch to the default) for SetMaximumFrameLatency
The value defaults to 3, but can range from 1 to 16. A value of 0 will reset latency to the default. For multi-head devices, this value is specified per-head.
Frame latency is the number of frames that are allowed to be stored in a queue before submission for rendering. Latency is often used to control how the CPU chooses between responding to user input and frames that are in the render queue. It is often beneficial for applications that have no user input (for example, video playback) to queue more than 3 frames of data.
i don’t know of another method to lower the pre-rendered frames queue or to lower it further… other than using an fps limiter and lowering fps enough or via a driver option (like nvidia’s ultra low latency mode or nvidia’s reflex…)