I don't think this happens in all instances, but I was recently watching a recording of "Around the World in 80 Days" from PBS. And I noticed what looked like an occasional visible frame dropping... scenes with motion appeared to have a slight occasional lag or jarring. I checked the stats and sure enough, it was dropping a lot of frames. In order to get the recording to play correctly, I needed to change both Video and Deinterlacer to Default. And then was able to watch the show without the frame drops. I don't think this being a recording had anything to do with it. I think it was broadcast in a way that was causing issues with the drivers.
This isn't urgent, as the workaround is the Default drivers. I am just reporting it so that Experimental drivers don't become Default until such issues are resolved.
Although less severe, I also can see frame drops in the stats while watching live NFL when using Experimental drivers. But Default drivers work fine.