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use strict;
use Benchmark;
...
              'sprintf'  => 'sprintf "%x%x%x",ord("a"),ord("b"),ord("c
+")'
              }
          );

Benchmark: timing 1500000 iterations of sprintf, unpack...
   sprintf:  0 wallclock secs ( 0.17 usr +  0.00 sys =  0.17 CPU) @ 88
+23529.41/s (n=1500000)
            (warning: too few iterations for a reliable count)
    unpack: 10 wallclock secs ( 9.87 usr +  0.01 sys =  9.88 CPU) @ 15
+1821.86/s (n=1500000)