$WW,1$The profiler records where the CPU was executing when the $TX,"1000Hz",D="DD_JIFFY_HZ"$ timer interrupt occured, so you can learn where time is spent.
Use the $LK,"Prof",A="MN:Prof"$() depth argument to record a hit in the N routines which called the current routine, as well.
When done collecting statistics, use $LK,"ProfRep",A="MN:ProfRep"$() for a report. You might need a $LK,"DocMax",A="MN:DocMax"$() to expand the command line window buffer to fit it all.