Let me start of by saying I'm not 100% sure if I should put this under bugs, but the issue either way is not because of my PC. So for the lag spikes, The happen everywhere in the world, but almost always at the surface. I am playing the game with an average of about 25 FPS, but about every 2-4 minutes I will experience a lag spike of 0 FPS for about 4-5 seconds and on rare occasions the game will crash. This occurs more often when more players are on my world. When the lag occurs the other play will experience some issues but will not be disconnected. One issue include not being able to open chests. Thanks for looking at this report, sorry if it doen't belong here, but I thought you should know.