4K/HDR performance issues?

You should start by setting all of those to “Off”, together with any other kind of “enhancement” or “noise reduction” setting - they all do more harm than good. You probably also want to set Sharpness to 0 (although that varies a bit from TV to TV).

If you don’t like the effect of everything being turned off, keep everything else off and try turning on Black Frame Insertion. If that doesn’t look good either, turn BFI off again, and try the lowest possible setting of Intelligent Frame Creation. Anything higher than “Min” (or whatever the lowest setting is) will likely lead to the dreaded Soap Opera Effect and possibly to other artefacts as well. Intelligent Frame Creation being set to High may well be the cause of your problem by itself - we’ll see.

Incidentally, if your TV has a Filmmaker Mode, I would expect that to turn all this stuff off automatically - that often gives the best results on TVs that have it.