Tbh, I have not tested anything related to playback. Last time (= when it was on the nightly) I did, I had a video (sindel) + its subtitles to test how they look on kodi 20, because I asked for a change in the default font. However, this change has not come yet and I doubt if it will for nexus's lifecycle. I did notice some shuttering though on that video's (h264) playback, but nothing more than that.
Where I do notice a lot of shuttering (almost unwatchable) is on le 10 and 11 x64 on my old laptop, since the very first betas of le 10. I will open a new thread about it when I can. No issue with le 9 though, that is why I have kept it for so long.