$ type /bin/echo
  /bin/echo is /bin/echo
  $ time /bin/echo "hello world"
  hello world

  real	0m0.009s
  user	0m0.002s
  sys	0m0.004s

  $ type echo
  echo is a shell builtin
  $ time echo "hello world"
  hello world

  real	0m0.000s
  user	0m0.000s
  sys	0m0.000s