P.S. Has anyone gotten the typometer application described in the OP to work with a graphical emacs on OS X? Whenever I open the application, my Emacs just freezes till I close the application.
Yes, it works for me. I'm using the Mitsuharu version. Results: text mode - 6.7ms (SD=0.3); fundamental mode - 6.7ms (SD=0.2); js2 mode - 13.2ms (SD=11.6); org mode - 13.9ms (SD=14.2)