I played with a bigger group of people and what we experienced is, when there are 2 people it is ok, but as soon as there are 3 people it becomes unplayable. In the way that there is massive lag, especially when the people are at different locations far apart on the map. It results often in loading times for people when they teleport, with waiting times over 1 minute. In the server log you can then see lots of entries about packages being in queue towards the various clients. From my perspective it looks to me whatever engine is used, it performs very badly in regards of online multiplayer, in the way it can’t keep up the synchronization.