To enable Profiling with DBG you have to make the following to your
php.ini:

section "[Debugger]" -> add "debugger.profiler_enabled = true"

Then you have to start a DBG session as usual (by running a script
that is located on a DBG enabled server), now you can start
to analyze the profile of your script by hitting Alt+P or
by selecting "Profile Analyzer" in the "Run (Debug)" Menu.