Essentially, this module is a very optimized version of Clone::More. By taking advantage of one of Clone::More's 'OPTIMIZATION_HACKS' as well as removing all the Pure Perl from the More.pm, I was able to gain a lot of speed out of the module. Essentially, though, the core of the module is exactly as that of Clone::More. You will see that by useing Benchmark::cmpthese, I ran a simple comparison between Storable::dclone, Clone::More::clone, and Clone::Fast::clone. You will (should) begin to see the reason why I loaded this module along side of Clone::More. Rate Storable Clone::More Clone::Fast Storable 7552/s -- -39% -59% Clone::More 12400/s 64% -- -33% Clone::Fast 18442/s 144% 49% -- For more information relative to the DESCRIPTION of this module, I recommend peeking into the POD written for Clone::More (I took more time with it ;) ) WWW: http://search.cpan.org/dist/Clone-Fast/