Rate    split1   substr1   bit_ops map_split
split1    1.25/s        --      -95%     -100%     -100%
substr1   25.5/s     1939%        --      -96%      -99%
bit_ops    642/s    51313%     2421%        --      -71%
map_split 2230/s   178496%     8657%      247%        --