Not sure what else to say here other than if I enter a compact machine (13x13 - maximum) that I built the tickrate on the server tanks something fierce. (like a solid 20tps to 10, mean tick time of 64 ms in dimension 144)

Note it doesn't do it for the first compact machine I built (giant size - 11x11), just the second one (the 13x13 max size). Just cheated in a giant compact machine (the 11x11 one), only got the initial terrain gen tickrate fall, it quickly stabilized back at 20tps. (like less than a minute)