How very odd!
My testing on Win2k, ActivePerl 5.8.8 shows that the case of the data doesn't affect the timing, and that old_way is consistently just shy of 50% faster than with_tr.
Upper case data
===============
Rate with_tr old_way
with_tr 183850/s -- -32%
old_way 272269/s 48% --
Lower case data
===============
Rate with_tr old_way
with_tr 182262/s -- -33%
old_way 270854/s 49% --
Benchmark code:
Of course, inlining the code saves a lot of time:
Rate with_tr old_way with_tr_i old_way_i
with_tr 180473/s -- -32% -39% -52%
old_way 265506/s 47% -- -10% -29%
with_tr_i 296058/s 64% 12% -- -20%
old_way_i 372377/s 106% 40% 26% --
Benchmark code:
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