I used the default one in CmakeLists.txt (-O3). I ran the comparison again on another machine that I have and this time their performances are about the same:

I used the default one in CmakeLists.txt (-O3). I ran the comparison again on another machine that I have and this time their performances are about the same: c++: $ time ./tinykaboom ./tinykaboom 46.72s user 0.01s system 364% cpu 12.804 total go: $ time ./tinykaboom ./tinykaboom 42.50s user 0.07s system 350% cpu 12.161 total