------ UPDATE (SOLUTION) ------

First, I want to thank to all of the guys here that gave me valuable ideas and tips.

The problem seems to hide in newer glibc working with i386-compiled perl (that's only a humble guess, I would gladly accept any other truthful explanation). I downloaded a new Fedora SRPMS, rebuilt it with i686 target and forcibly installed the newly built RPM over the existing one. Nevertheless that "perl -v" still shows that it's i386 version you should not believe it. Now perl seems to be fast enough Now perl seems to be fast enough (will need a couple more tests but it seems real now)! :)