Diablo III is for real

[Nystul]

The biggest example of this is character speed in D1. much of the tension and strategy mentioned in relation to D1 is a direct effect of the slow character movement. While the slow character movement was created because if the character moved faster than that the engine and the computers of the time wouldn't be able to load the graphics and lighting fast enough for the game.

That was almost convincing until I remembered that Diablo has a teleport spell....