This would make Plex a great tool for analyzing technique in self shot sports footage, and would have other uses as well. Slow motion and even frame by frame playback would be great.
I would also like slow motion playback.
We use Plex in our dance school for our rehearsal videos. Slow motion is a very desirable feature...
Yes, I would also like this - would be great to slow videos down (and have playback speed remembered on a file-by-file basis) for learning how to play musical instrument like piano
Yes please!
agreed this would be very helpful when using film for learning, please add this feature.
Just want to bump this request. My ATI AIW software from 1995 had slow motion. :)
Bumping this one. It’s a much-needed feature.
Yearly bump. I recently wanted to see something in slow motion while watching in my home theater.
I had to go into my office and use VLC to see it.
Came here to see if it had already been requested and found this thread. i LIKE the idea. 
Would also like to see it
As a coach I would use this as a tool to share videos to all my assistant coaches and even players. Would recommend looking at what HUDL does for their playback. Also the ability to slow-mo the same section over and over again. Ease of use and quick rewind to a specific spot would be awesome!
More exposure to PLEX…win win for all.
SToGE
i also would really like to have a slow motion feature it would help with coaching and keeping all my videos in plex
Yes!! PLEASE!!! Sports shows and paranormal shows require this. Sometimes new action pix have cool special effects that are cool slowed down.
I would like to be able to change the speed of playback on Plex down to and including slow motion. Is that not a feature at the moment? If not, is it planned? I’ve seen this question asked before here but never saw an answer.
i would also love to use this feature… please let me kow if you find out more about it?
2025 clean-up: implemented (playback speed controls)
https://support.plex.tv/articles/video-playback-speed-controls/