I've also tested it and can confirm it.

Master branch:
raw times: 8.43 sec, 7.26 sec, 8.16 sec, 8.4 sec, 7.31 sec                                                                                                                                                                                                                                                                                                                                                                                                                                100000 loops, best of 5: 72.6 usec per loop

v3.8.0:
raw times: 13.6 sec, 11.9 sec, 11.6 sec, 11.7 sec, 12.3 sec                                                                                                                                                                                                                                                                                                                                                                                                                               100000 loops, best of 5: 116 usec per loop 

v3.7.4:
raw times: 2.55 sec, 1.9 sec, 2.7 sec, 2.42 sec, 2.17 sec                                                                                                                                                                                                                                                                                                                                                                                                                                 100000 loops, best of 5: 19 usec per loop