Win 3.1 wasn’t even that slow on a 386sx (yay, 386 buddies! o/), its nothing compared to Win 11 on midrange and lower laptops these days. Then again, those CPUs usually came in PCs with Win 3.0, so Win 3.1 was definitely noticeably heavier. MS also wasn’t nearly as large and well funded back then, there is no excuse for this other than pure incompetence.