A few quick tests show Devel::Size::total_size(\%::main) on Bricolage taking around a half a second right after startup, on my PIII/600. As the app is used and the various memory caches start to fill up that time increases up to around 1 second per call.

While that's certainly not bad for most uses, adding a 1 second overhead to every subroutine call would bring Bricolage (or any large Apache/mod_perl app) to a halt. Some actions require thousands of method calls, and most web browsers would time out before the response got back.

However, you were right about one thing; it is a heck of a lot faster than Devel::Profiler!

-sam