If I remove the backreference by changing the regex in my example to $n++ while ($s =~ /(.*?)RRRR/sg);, I get the following:
time ~/bin/perl5.8.0 reg.pl
500 matches
real 0m0.018s
user 0m0.010s
sys 0m0.010s
time ~/bin/perl5.6.1 reg.pl
1 matches
real 0m0.015s
user 0m0.010s
sys 0m0.000s
So at least in this case Perl 5.8.0 doesn't have a speed problem. I don't know exactly what's going on in your code though.
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