[Etheryte]

I'm not sure that holds when you take the speed of light to be infinite. Depending on which end you look at it, you'll either be dividing by zero or having infinite energy, so I don't think relativity the way we understand it would still make sense in any way.

[cjfd]

Well, it is quite well known what you get when taking the speed of light to infinity. It is classical mechanics.

[Etheryte]

Point being, in that case you don't have relativistic effects nor effects preceding causes and whatnot.