[Bug 254763] grep very slow with 13.0-RC4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254763

--- Comment #27 from Kyle Evans <kevans@freebsd.org> ---
(In reply to Dmitry Chagin from comment #24)

It's not clear if you posted the wrong link or what; this seems to be proposing
a better cat(1) using splicing or sendfile with a note that people are weird
and use cat to pipe into grep (instead of just using grep on the file).

The main advantage gnugrep has over us is that it doesn't read input buffers as
much, but we inspect each and every single byte.  There's a whole ML post
somewhere from 10+ years ago about how their technique with some lessons we
could take from it, but as I noted before: it's not a small job, and I haven't
found anyone that cares enough to fund it (it turns out that 'grep' speed is
not "sexy", just worth complaints...).

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