It seems that important role in performace plays test for fill element.
So far I've seen 3:
ft1=:(+./"1@:~:&' ')
ft2=:([EMAIL PROTECTED] 1{.0{.])
ft3=:([EMAIL PROTECTED]:"1 [: {. 0 {. ])
with ft3 is the fastest.
tacitizing Mike Powell's solution and using ft3 for fill test we arrive at
dragMP3=:(((_1 + +/\)@] { #~) ft3 f.)
which is twice as fast as drag0.
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