Go to documentation repository
When you play back the archive 2-10 times faster, visual change in speed may not be noticeable if the computer processing power is insufficient (processor doesn’t have time to process each frame of the video). 12x and more speedup becomes noticeable because only key frames are played back, that is, decimation is enabled. You can change the speed at which decimation starts in the MonitorForwardSkipSpeed registry key.
Full article: Video playback controls