$ perl -E'@x=("x" x 100) x 11;say join"\t",@x for 1..2_000_000' > test.tsv
$ perl test.pl
       s/iter   tcsv tcsvbc   splt   none
tcsv     23.3     --   -32%   -74%   -92%
tcsvbc   15.8    47%     --   -61%   -89%
splt     6.13   280%   158%     --   -71%
none     1.78  1206%   788%   244%     --