I'm guessing much of the OpenBSD trailing performance on many benchmarks is due to both memory allocation and filesystem performance. malloc has a lot of security features out-of-the-box; turning them off (don't do that at home) might improve the speed.
But basically these are not benchmarks but conversation topics. A "real" benchmark runs your own code, not someone else's.
As an interesting topic, the LAME result went from 9.94 seconds (OpenBSD 6.4, 2018, Intel Core i9-7980XE) to 18.476 seconds (OpenBSD 7.0, 2021, Intel Core i9 10980XE). So many things changed over those 7 releases....