I would advise not worrying with it. It isn't going to make any real difference. The overhead is nearly immeasurable and low-priority.
BUT, it is in the 'Options / Log Settings'. Apparently there is a little bug where disabling ALL logging doesn't completely disable logging, I'm working on that. However, individual log entry types may be turned off. For instance, you could turn off process creation/exit logging, which account for a majority of log entries.