I think a big problem for why not a lot of people can handle 1.0 is because of the render distance, for legacy there was fog hiding the map when looking afar or it wasn't loaded in fully. On my end on 1.0 it seems like I can see from one end to the next. Maybe if render distance was lessened a lot more people's computer would be able to handle the game.
By all means I don't know anything about configuration, computers, etc. But I do think a goal in mind is to have everyone on 1.0, so no one is left behind or forced to play alone. I hope this suggestion helps, if not thank you for taking the time to read it. Have a great day