Rate  b_t  a_t  b_s  a_s
b_t  8190/s   --  -1% -40% -40%
a_t  8258/s   1%   -- -39% -40%
b_s 13615/s  66%  65%   --  -1%
a_s 13720/s  68%  66%   1%   --