vim profiling (e.g. for finding slow plugins)
http://stackoverflow.com/a/12216578/675100
:profile start profile.log
:profile func *
:profile file *
" At this point do slow actions
:profile pause
:noautocmd qall!
// --------------------
http://stackoverflow.com/a/20519492/675100
:syntime on
move around in your ruby file and then
:syntime report