% stephan@labaule (/home/stephan) %
% cygcheck -s | grep ^cygwin' '
cygwin               1.5.22-1

% stephan@labaule (/home/stephan) %
% perl -v | head -n 3; perl -W perf_test.px

This is perl, v5.8.7 built for cygwin-thread-multi-64int
(with 1 registered patch, see perl -V for more detail)

Section A took 1.5920 CPU seconds
Section B took 3.3950 CPU seconds
Section A took 1.6030 CPU seconds
Section B took 3.4550 CPU seconds

% stephan@labaule (/home/stephan) %
%  perl -W perf_test.px                    
Section A took 1.5920 CPU seconds
Section B took 3.3650 CPU seconds
Section A took 1.6030 CPU seconds
Section B took 3.4350 CPU seconds

% stephan@labaule (/home/stephan) %
%  perl -W perf_test.px
Section A took 1.6020 CPU seconds
Section B took 3.5250 CPU seconds
Section A took 1.6120 CPU seconds
Section B took 3.3850 CPU seconds