Rate _open _regex _substr _split _unpack _open 265986/s -- -53% -55% -57% -70% _regex 563780/s 112% -- -5% -8% -36% _substr 593788/s 123% 5% -- -3% -33% _split 612001/s 130% 9% 3% -- -31% _unpack 881949/s 232% 56% 49% 44% --