Very strange, not happening here and I was able to test in Max 2022 (and was already using Win 10, and English USA), both 2022 and 2023 open instantly for me e.g. the Base Color of a Corona Phys Mat (in a scene that just has a cube, a sun, and the Phys Mat applied to the cube - no IR, nor viewport IR). I will have to leave it to the support folks to dive into more about what could be causing this, as can't think of anything myself, sorry.