my $s = join "", map chr(ord('a') + int rand 26), 1 .. 200;
cmpthese(-3, {
    eertree => sub { 'String::Eertree'->new(string => $s)->uniq_palindromes },
    rosetta_new => sub { rosetta_fixed($s) },
    ee => sub { ee($s) },
});

              Rate rosetta_new     eertree          ee
rosetta_new  271/s          --        -58%        -93%
eertree      651/s        140%          --        -84%
ee          3964/s       1362%        509%          --