Mod Pack: Horizons Mod & Version: Horizons 1.0.9 Pastebin: What's the bug: Not sure if this belongs here, so I apolagize if it does not. I play on a single player world that I open to Lan where my wife and roommate join me. have played for a while with no issues or lag (have 10g allocated to it, and run a good computer ). Recently we built a 50x50ish area with many mods of asthetic blocks. In this area, and only this area, we find really bad lag that causes the game to give 2-5 second freezes when you place blocks, or destroy them. We have tried replacing every type of block inside, and took out the AE storage, and still no fix. Can it be repeated: I have not tried to repeat this other then having the problem on my single player map. Known Fixes: Edit: Something about the lag, it seems to be focused into a 12x30 area, and when you set a block it sets an additional 1-3 more connected. As well, when you break a block when its done being frozen you break through 2-3 more blocks as though you held the button down.