[XTrojan]

This would be worthwhile if your display is 2160p. madVR's NNEDI3 Luma Doubling and Luma Quadrupling is known to produce impressive results when doing this type of scaling. Image doubling to 4K requires a very powerful GPU.

I'm gonna give it a try. Regarding 24P, is it possible the TV refreshes too slow to catch up with V-Sync? When 3D mode is engaged my TV disables some color accuracy which i can't get back, but this might be the reason it plays smooth on stereoscopic player?

3D mode engaged -> You can only choose "film" or "standard" mode on my TV settings.
3:3:2 Pulldown has massive motion blur and is unwatchable with "Natural" mode on, i've been really blind.

I basically put my TV settings on "Natural" mode to get the best color/settings possible, but it also enhances input lag and makes artifacts more visible, i'm not sure why this setting is available if this is the root of all evil, gonna test tomorrow.

So far i've found 0 evidence it's the players fault, tried on both DSPlayer/MPC-HC, haven't tried PowerDVD.

I can't see a modern TV not refreshing at the same rate as Blu-ray content. But I can believe that some processing created by the TV to create 24p playback (e.g. refreshing at 120 hz by repeating frames evenly) could create some video lag. With my TV, it seems to be just enough to create occasional lip-sync issues. It is a high-end Samsung LED, but it seems to suffer from a form of lag that is similar to input lag when playing video games. I will replace the TV when OLED becomes more affordable. But, you are right, it is unlikely to be the player or the audio renderer. From much experimentation with many players and renderers, the combination of Kodi refresh rate switching with ReClock audio rendering has given the best results. But I'm not impressed by my Samsung LED. It should not suffer from this problem.

As far as i can tell, it actually was the cause, lol.

I tested watching 20min and it was smooth as heck and no artifacts.

My only guess would be that "natural" mode is actually "picture" mode that increases saturation, sharpness etc but when it gets in contact with the movie renderer they collide and destroy each other causing artifacts and lag for the TV.