Benchmark: running s///, tr///, each for at least 10 CPU seconds...
      s///: 12 wallclock secs (10.80 usr +  0.02 sys = 10.82 CPU) @ 37.89/s (n=410)
     tr///: 15 wallclock secs (10.08 usr +  0.08 sys = 10.16 CPU) @ 42.81/s (n=435)
        Rate  s/// tr///
s///  37.9/s    --  -11%
tr/// 42.8/s   13%    --
OK