That usually works, but I don't see how it would cause lag if fire spread was disabled? O-oThey deactivated it for grief & lag reasons I think. In my opinion, while it'd be nice to have fire, it would be over-abused & cause lag. If you REALLY need fire to be placed somewhere, maybe politely ask an Admin or a Builder. "POLITELY"
That usually works, but I don't see how it would cause lag if fire spread was disabled? O-o