This patch allows the tracing code to be conditioned out by the absence of a definition for the symbol WITH_TRACING. This seems to win a worthwhile speed gain.
Logged In: YES user_id=849994 As the result of some tests was that the patch even caused slowdowns on some configurations, it was decided not to follow this path. Closing this as "Postponed", since someone might try to do something like this in the future.