Loops with print (I used a NULL device to keep it clear, s.below):
              Rate foreach_loop   c_for_loop
foreach_loop 256/s           --          -8%
c_for_loop   278/s           8%           --

Loops with '1':
               Rate   c_for_loop foreach_loop
c_for_loop   1314/s           --         -22%
foreach_loop 1674/s          27%           --