[Cin] Playback slowdown

I did some tests again with the 2019/01/16 release and I don't notice any more slowdown problems with the playback.. Where before I went from 30 fps to 10 or even 1 fps; now I go from 30 to 27 - 28 fps. I'd say the problem is solved! Thank you very much. In my opinion, the mismanagement of mkvs and pngs remains; but no more than it always has been. Do you think it is better to open an issue on this subject?