It's probably my computer (>3 yr old laptop), but I've been getting some lag ranging from mild to "goddamnit I got killed again by mobs I never saw" lately. It's not much different from before, though, so I bet it's my computer.
Also, look how much land to the north (game, not map) of my square I've cleared off! I love love love runes. Gotta figure out the teleportation one, but the power tools one kicks twenty kinds of ass. I plan on clearing the land to the east of the cleared land, along that peninsula, too. No major plans with it yet; I just really enjoy clearing stuff. If anyone needs lava in that area, the glass bricks can be destroyed and stairs down to a pool of lava are right there.