I distinctly recall playing the shareware Doom just fine on a 486/25 SX in 1993. It wasn't totally fluid, but it was perfectly playable.
The DX2/66 was just what everyone had by the mid 90s it seems, and with Doom 2 and Duke 3D being out by then, I think it's just the Mandela effect. Doom 1 ran perfectly well on a 486 and was also playable on a 386.
The DOS version had a number of assembler improvements that I highly doubt the NeXT version had any equivalent for since what wasn't their target market.
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