I have an admittedly low spec Tanix TX3 running CE with the data stored onboard and with a wired network interface but also an Apple TV 4K running MrMC. Local media is 1080p and I have no complaints about playback but the GUI on the latter is much faster including when updating content metadata from my NAS.
What is the limiting factor for the poor GUI performance so that I can make an informed purchase for my next, more responsive, CE box? CPU? GPU? Memory? Storage? All of the above ?