time -d-test Gtk3 
  real    0m0.412s
  user    0m0.074s
  sys     0m0.337s

time -f-test Gtk3 
  real    0m0.478s
  user    0m0.076s
  sys     0m0.388s

time find . -type f -print0 | xargs -0 rm
real    0m0.334s
user    0m0.012s
sys     0m0.321s