[Bug 255551] FreeBSD sort much slower than GNU or NetBSD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255551

            Bug ID: 255551
           Summary: FreeBSD sort much slower than GNU or NetBSD
           Product: Base System
           Version: 12.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: jwb at freebsd.org

This isn't really a problem, since FreeBSD's sort command is more than fast
enough for my purposes, but it seems worth reporting in case it exposes an
undiscovered problem that might be easy to fix.

All tests were run on the same machine, a ThinkCenter i5 with 8G RAM.  NetBSD
running under VirtualBox.

NetBSD netbsd9.acadix  bacon ~/Prog/Src/peak-classifier 435: (pkgsrc): time
sort -n -k 1 -k 2 -k 3 pc-gff-stripped.bed > /dev/null
1.409u 2.548s 0:03.95 99.7%     0+0k 0+0io 0pf+0w

FreeBSD coral.acadix  bacon ~/Prog/Src/peak-classifier 1005: time sort -n -k 1
-k 2 -k 3 pc-gff-stripped.bed > /dev/null
24.574u 0.795s 0:25.37 99.9%    55+172k 0+0io 0pf+0w

FreeBSD coral.acadix  bacon ~/Prog/Src/peak-classifier 1006: time gsort
--parallel=1 -n -k 1 -k 2 -k 3 pc-gff-stripped.bed > /dev/null
3.005u 0.149s 0:03.16 99.3%     152+177k 6+0io 3pf+0w

I generated a simpler file using just column 2 from the bed file and ran a
simple sort -n on it (no -k flags).  Results were similar, so the performance
difference is not limited to multicolumn sorting.

Results are the same on 12.2 and 13.0.

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