I was reading over internet regarding the performance issue of Perl bundled in some Redhat versions (A combination of Rehhat and Perl version) which uses multiple bless/overload. Vipul’s blog has given a good insight on this problem.
Well, Red hat has finally registered the bug last year on Bugzilla.
Would recommend everybody falling under this should test it. You can test your running installations by using the program given in Bugzilla. I have done at my end and fortunately I am out of the bug. I was running Cent Os 4.6 with Perl 5.8.6.
All the best