If there’s a single upside to the collapsing standards of technical competence among big-budget PC games, it’s that when something like Diablo 4 comes along and simply performs well, there’s an almost pleasant relief to it. Like your bus arriving on time, a minute after watching the previous, late-arriving one flip onto its roof attempting a handbrake turn.
It’s not perfect, but Diablo IV does run smoothly for the most part (also sorry Google, but I'm going back to Roman numberals), and its system requirements on PC are as likely to involve museum pieces as they are the latest and priciest graphics cards. I’ve put some hours into the early access build and have come up with a best settings guide, but in truth, this will likely just optimise your framerates – Diablo IV’s higher quality settings rarely trouble it, especially at 1080p.