Superstition makes me post-increment; I think it’s not slower anymore but was back in the dinosaur age.

Post-increment is necessarily slower since it requires making a copy of the scalar that pre-increment doesn't. However, Perl replaces post-increment operators in void context with pre-increment operators. 

$ perl -MO=Deparse -e'$_++ for @a;'
++$_ foreach (@a);
-e syntax OK

$ perl -MO=Deparse -e'map { $_++ } @a;'
map {$_++;} @a;
-e syntax OK

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In reply to Re^4: map vs for\foreach. by ikegami
in thread map vs for\foreach. by builat

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