[puithove]

Nice to know you solved your issue, but it's not the same than mine.

I have a pretty good 23.976Hz (although not perfect) thanks to a custom res in my Nvidia panel.
And I have no madVR frame issues in madVR stats.
Only video stuttering during OSD.

I don't think it's related to performance issues, otherwise I would see dropped frames in madVR stats.

What are your fullscreen settings for both Kodi and madVR? I had issues with the OSD causing stuttering when I was first setting up the dsplayer build. I found that playing with different combinations of exclusive mode could trigger the issue. I believe I landed on both Kodi and madVR set to Fullscreen Windowed mode.