new, new_u, old, old_u, each for at least 2 CPU seconds...
       new:  2 wallclock secs ( 2.04 usr +  0.00 sys =  2.04 CPU) @ 505.62/s (n=1031)
     new_u:  8 wallclock secs ( 2.09 usr +  0.05 sys =  2.15 CPU) @ 236.45/s (n=508)
       old:  3 wallclock secs ( 2.12 usr +  0.00 sys =  2.12 CPU) @ 130.82/s (n=278)
     old_u:  7 wallclock secs ( 2.05 usr +  0.06 sys =  2.12 CPU) @ 102.49/s (n=217)
       Rate old_u   old new_u   new
old_u 102/s    --  -22%  -57%  -80%
old   131/s   28%    --  -45%  -74%
new_u 236/s  131%   81%    --  -53%
new   506/s  393%  286%  114%    --

new, new_u, old, old_u, each for at least 2 CPU seconds...
       new:  3 wallclock secs ( 2.19 usr +  0.00 sys =  2.19 CPU) @ 500.11/s (n=1094)
     new_u:  5 wallclock secs ( 1.94 usr +  0.12 sys =  2.06 CPU) @ 246.30/s (n=508)
       old:  2 wallclock secs ( 2.13 usr +  0.00 sys =  2.13 CPU) @ 135.50/s (n=289)
     old_u:  4 wallclock secs ( 2.10 usr +  0.03 sys =  2.13 CPU) @ 106.43/s (n=227)
       Rate old_u   old new_u   new
old_u 106/s    --  -21%  -57%  -79%
old   136/s   27%    --  -45%  -73%
new_u 246/s  131%   82%    --  -51%
new   500/s  370%  269%  103%    --

 new, new_u, old, old_u, each for at least 2 CPU seconds...
       new:  2 wallclock secs ( 2.09 usr +  0.00 sys =  2.09 CPU) @ 510.56/s (n=1065)
     new_u:  5 wallclock secs ( 1.89 usr +  0.13 sys =  2.02 CPU) @ 260.94/s (n=528)
       old:  2 wallclock secs ( 2.14 usr +  0.00 sys =  2.14 CPU) @ 139.21/s (n=298)
     old_u:  3 wallclock secs ( 2.01 usr +  0.03 sys =  2.04 CPU) @ 111.33/s (n=227)
       Rate old_u   old new_u   new
old_u 111/s    --  -20%  -57%  -78%
old   139/s   25%    --  -47%  -73%
new_u 261/s  134%   87%    --  -49%
new   511/s  359%  267%   96%    --