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Are you using some form of VRR? G-sync/Freesync? Smooth motion does not work well with VRR, disable VRR for madVR and/or your player.
The CPU buffer is the in system memory buffer. It holds frames before they are uploaded to the GPU, after any CPU processing steps (IVTC, etc.). This is the "before madVR" buffer.
The GPU buffer is for after madVR but before present, this is how many completed frames are stored on the GPU. The "after madVR" buffer. This one has more impact in my experiance, the CPU buffer only benefits from a few extra frames. Too big is as bad as too small in my experiance, the default 8 is good. 6-12, above that has never helped on my systems.
Use a separate device does not seem to help with Windows 10. It was mostly useful in the early days of hardware decoding on the GPU, newer OS and drivers seem to have fixed any issues that using a separate device might help. I leave it disabled today as unnecessary overhead but it did not seem to hurt anything during testing.
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