v5.42.0 / MSWin32-x64-multi-thread / 13.2.0

String length: 10,000
             Rate/s    %
 c            87663   100
 va          622005   710

String length: 100,000
             Rate/s    %
 c             8875   100
 c_omp        15439   174
 va           71646   807

String length: 1,000,000
             Rate/s    %
 c              891   100
 c_omp         2307   259
 va           12770  1434

String length: 10,000,000
             Rate/s    %
 c             88.3   100
 c_omp        361.2   409
 va          1615.6  1829

String length: 100,000,000
             Rate/s    %
 c              8.8   100
 c_omp         36.2   410
 va           167.7  1900