What's the usual brickcount for these builds you're clearing?
ModTer has these kind of issues, even for beefy computers it has a little lag in it. It's something to do with the datablock because it's a big brick with print on it.
Is there a way i can get round this? or make it not crash every one on my server?
I've found that a way so that you do not lag as long, is to /clearbricksThis will clear all of YOUR bricks instantly, instead of clearing all bricks in an orderly fashion