[GalacticDomin8r]

Compiler is also going to make an impact which for me is consistent across both grep binaries.

FreeBSD clang version 6.0.1 as well as -O2

I suspect there are still edge cases where BSD grep is quite a bit slower or not compatible with GNU grep. However with a closer apples to apples comparison there isn't much difference anymore for my usage. Which is a lot of grep use but that is pretty vanilla.

There may also be other OS differences in our comparison. My tests where run against a fairly recent FreeBSD 12-STABLE.