How big is the impact? Better than 10x in a simple test (5.8.0 on Win2K).
Just for fun, here's the benchmark. It took some guesswork to get it to run the subs in the right order - clean first, then use English;, then naughty. If anyone uncomments the print statements to test the order, use 1 as an argument so you don't have to wait forever. Here are the results:
use strict;
use Benchmark qw/cmpthese/;
my $time = shift || -5;
my $text = 'x' x 10_000;
sub clean {
# print "clean";
$text =~ m/^x/;
}
sub make_dirty {
# print "md";
eval "use English;";
}
sub naughty {
# print "naughty";
$text =~ m/^x/;
}
my %hash = ( clean => 'clean',
naughtify => 'make_dirty',
sawamp => 'naughty',
);
cmpthese ( $time, { clean => 'clean',
naughtify => 'make_dirty',
sawamp => 'naughty',
});
__END__
results:
C:\s\pldir>naughty.pl -5
Rate naughtify sawamp clean
naughtify 433/s -- -98% -100%
sawamp 24153/s 5481% -- -92%
clean 300603/s 69366% 1145% --
Someone with more benchmark-fu may correct me on this, but it looks right to me.
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