Hey there,
For the problems happening on the vanilla version of the game, we’ve identified a most likely cause for the problems affecting, again, those playing in unmodded servers. This issue has been addressed and will be released, as we announced above, early next week.
We’re currently investigating other possible causes for these slowdowns. Again, please take a look at my previous message here.
Thanks to the majority who has been sending us constructive and helpful feedback and for keeping this thread on track.