Perhaps your luck will be better, or the problem will be fixed soon on YouTube's end. The videos of mine I can actually view in 2160p60 play very choppy for no real good reason. Please note, the 4K option on YouTube, at least on my end, seems a bit buggy at the moment. I have many graphical mods running in this Let's Play, as well as Oscuro's Oblivion Overhaul, which as you may or may not know completely overhauls the level-scaling and encounter design in the game, amongst other things! So, this is going to be a BRAND NEW, fresh Let's Play that you may have not seen the likes of in other Let's Plays! I recently decided to try my hand at modding Oblivion a bit, and I thought, 'Why not make a Let's Play in 4K resolution with lots of mods running?'.