Measuring performance will be harder

      x←?1e4⍴100
      cmpx '⊃⊖x' '⊖x' '⌷⊖x'
  ⊃⊖x → 8.7E¯8 |    0% ⎕⎕⎕⎕
* ⊖x  → 6.6E¯8 |  -25% ⎕⎕⎕
* ⌷⊖x → 8.6E¯7 | +890% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕