The following _expression_ takes about 12 seconds to compute on my laptop:
{⍺+⍵}/ ⍳1000000
However, the equivalent _expression_ without the lambda _expression_ is immediate (i.e. thr prompt returns before I have time to notice that it even started calculating):
+/ ⍳1000000
What is causing the large difference in performance?
Regards,
Elias