Why does apache's mod_status extended status slow down the server?

Excerpt from Apache Performance Tuning Guidlines

mod_status and ExtendedStatus On If you include mod_status and you also set ExtendedStatus On when building and running Apache, then on every request Apache will perform two calls to gettimeofday(2) (or times(2) depending on your operating system), and (pre-1.3) several extra calls to time(2). This is all done so that the status report contains timing indications. For highest performance, set ExtendedStatus off (which is the default).

It needs to compile, store and keep track of extra statistics. I haven't read the code but my gut tells me it uses a bit more memory and considerable more CPU cycles.