Serious issues with game freezing for around a minute at a time for every few minutes of game play. Seems to be when autosaving occurs. Worse in multiplayer games, but still occurs in singleplayer.

By the time the game has caught up and you're moving again, you've often been killed. Critical bug. 

When other people are playing on your game, they will usually be disconnect every 5mins or so with the "disconnected from server" message appearing. It's practically impossible to play with others in the game's current state.

These issues began occurring a couple of updates ago (around when the crossbow was added as an experimental item, and scaffolding was added). Prior to this it was fine.