our @data = ("xxx") x 1000;
cmpthese -2, { map { $_ => "$_ \@data" } qw/naive listutil buk ikegami blokhead/ };

          Rate    naive listutil  ikegami      buk blokhead
naive    328/s       --     -26%     -44%     -49%     -49%
listutil 445/s      36%       --     -24%     -30%     -31%
ikegami  589/s      80%      32%       --      -8%      -9%
buk      637/s      94%      43%       8%       --      -1%
blokhead 646/s      97%      45%      10%       1%       --