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Why is the second expression, the longer expression, so much faster than the first?

   n← 10 2 ⍴ 1 2 3 1 2
   m← 10 3 ⍴ 10×1 2 3 1

   cmpx '   n {+⌿⍵}⌸m' '(n⍳n){+⌿⍵}⌸m'
     n {+⌿⍵}⌸m → 1.48E¯5 |   0% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕
  (n⍳n){+⌿⍵}⌸m → 1.20E¯6 | -92% ⎕⎕



query from user, 2018-10-18