perl seediff.pl
Benchmark: timing 50000 iterations of Damn Slow, Much Better...
 Damn Slow:  6 wallclock secs ( 6.12 usr +  0.00 sys =  6.12 CPU) @ 8172.61/s (n=50000)
Much Better:  3 wallclock secs ( 2.96 usr +  0.00 sys =  2.96 CPU) @ 16874.79/s (n=50000)