C:\test>587072 -N=10 -KEYS=a,b
dispatch =>
# line 1 "dispatch.pl"
        my $x += ( $dispatch{ $_ } ||= $dispatch{ default } )->()  for @data;

ifelse =>
# line 1 "ifelse.pl"
        for( @data ) {
            if( $_ eq "a" ) { my $x = $dispatch{ a }->() }
            elsif( $_ eq "b" ) { my $x = $dispatch{ b }->() }
            else{ my $x = $dispatch{ default }->() }
        }

            Rate   ifelse dispatch
ifelse   21966/s       --     -15%
dispatch 25880/s      18%       --

C:\test>587072 -N=10 -KEYS=a,b,c
dispatch =>
# line 1 "dispatch.pl"
        my $x += ( $dispatch{ $_ } ||= $dispatch{ default } )->()  for @data;

ifelse =>
# line 1 "ifelse.pl"
        for( @data ) {
            if( $_ eq "a" ) { my $x = $dispatch{ a }->() }
            elsif( $_ eq "b" ) { my $x = $dispatch{ b }->() }
            elsif( $_ eq "c" ) { my $x = $dispatch{ c }->() }
            else{ my $x = $dispatch{ default }->() }
        }

            Rate   ifelse dispatch
ifelse   16250/s       --     -22%
dispatch 20798/s      28%       --