time perl fluff.pl
              Rate    original local split  crlf split       naive
original    28.4/s          --        -32%        -43%        -80%
local split 41.8/s         47%          --        -16%        -70%
crlf split  49.6/s         75%         19%          --        -65%
naive        141/s        398%        238%        185%          --

real    1m26.512s
user    1m26.450s
sys     0m0.060s