In addition to limiting individual computers, it might be a good idea to limit all computers to a certain total percentage of the server's available CPU power. People will start whinging when computers lag, but it's worse if the whole server lags and the game becomes unplayable.Let's give speed cap to computers. Something like 3 operations per game tick or something like that. Or make some kind of operations slower than another.
Currently we have logic blocks and I didn't noticed any problems caused by them