Random crashes might be due to the lava crucibles. They cause memory issues. I get unusual lag in my single player game, which vanished when I removed the 5 crucibles that I had placed. I even had a crash once loading my world which showed ticking error and it reported the exhilo stone barrel as the cause.
Did the lag go away when the crucibles were removed, or the thermal expansion ducting delivering stone to the crucibles was removed. I don't wish to unfairly point fingers at a certain mod
