Lots of testing would be required though but Blizz could do all that in house etc.
I'm of the opinion that at some stage Blizz decided on a game speed but changed things up as it wasn't working the way it was expected. How else can you explain they release the game and everyone plays on faster?
If they wanted it at that speed to start with then it would be called 'normal' and we wouldn't have a clock in game that actually runs to fast, the clock would have been synced.
I don't know if you get what I'm trying to say, but I do
