There was an old game, "Land of Lore II" that was done for DOS, later was done a new episode, "Land of Lore III", this time it was for Windows 95 and DirectX, the visual appearence was the same and nothing new was added to the graphics, but the game was very much slower. So the proprietary software renderer running under DOS was very much faster than the other renderer using DirectX running under Windows, and the computer was only a 486!

Stupidity also evolves!