I know your point is that Ruby is where it's at, but do this: In the top line of config/boot.rb above EVERYTHING else, put this: require 'tracer' Trac

I know your point is that Ruby is where it's at, but do this: In the top line of config/boot.rb above EVERYTHING else, put this: require 'tracer' Tracer.on Now, start Rails. Wow that's a lot, huh? Stop again. Now try replacing those two lines with: set_trace_func proc { |event, file, line, id, binding, classname| printf "%8s %s:%-2d %10s %8s\n", event, file, line, id, classname } Start it again. Lot going on there...