Code review comment for lp:~prafulla-t/drizzle/drz-fast-timer-and-time-profile-refactoring

> If we don't print but only collect timing information, how does it effect
> performance ?

If we have TIME_PROFILE_ON define'ed, it collects timing information as well as
prints it at the end of query execution using errmsg_printf,
This printing is what should be causing performance degradation.
In current branch TIME_PROFILE_ON is off by default, and hence performance
is pretty much within norm.

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Thanks
Prauflla