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siteupdate performance: CentOS 7 vs Ubuntu 18.04 LTS vs FreeBSD 13.0

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yakra:
A comparison of siteupdate's multi-threaded performance under Centos, Ubuntu and FreeBSD on the same machine.
Tests were run on a Dell PowerEdge R420 with Dual Xeon E5-2420 CPUs & 12x4GB DDR3-1333 RAM (I can try to find out the timings if anyone wants).
Hard disks: The Linux (CentOS & Ubuntu) installs are on identical Savvio 15K.3s, whereas FreeBSD is on a Kingston HyperX SH103S3/120G. However, all stats CSVs, logs other than siteupdate, nmp_merged files, and graphs were written to /dev/null.

Info from uname -a and clang --version:

* CentOS 7
Linux lab3 3.10.0-1062.9.1.el7.x86_64 #1 SMP Fri Dec 6 15:49:49 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
clang version 3.4.2 (tags/RELEASE_34/dot2-final)
Target: x86_64-redhat-linux-gnu
* Ubuntu 18.04.5 LTS x86_64
Linux lab4 5.4.0-135-generic #152~18.04.2-Ubuntu SMP Tue Nov 29 08:23:49 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
Target: x86_64-pc-linux-gnu
* FreeBSD 13.0
FreeBSD bsdlab 13.0-RELEASE FreeBSD 13.0-RELEASE #0 releng/13.0-n244733-ea31abc261f: Fri Apr  9 04:24:09 UTC 2021     root@releng1.nyi.freebsd.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64
FreeBSD clang version 11.0.1 (git@github.com:llvm/llvm-project.git llvmorg-11.0.1-0-g43ff75f2c3fe)
Target: x86_64-unknown-freebsd13.0
Commit info:
HighwayData:    972df9bb65bf0a270b4fc00dcae30b1823ea484b
UserData:       d721ce609a34bd274bc48940f876f51564a89a94
DataProcessing: fbed09107b80b89cc1d2ecf9bb2b9c5a608c1062

Method:
The siteupdate executable was renamed siteupdate_fbed0.
check10.sh --null -v -tp 3 _fbed0 was used to automate 240 runs of siteupdate on each OS, 10 for each number of threads, saving siteupdate.log each time.
For each task, table.sh was used to iterate through each number of threads, find the before & after timestamps in siteupdate.log, calculate the time spent on the task in each of the 10 passes, then average all 10 passes together.

yakra:
ReadWptThread: Reading waypoints for all routes.

yakra:
WaypointQuadtree::sortnodes: Sorting waypoints in Quadtree.

yakra:
NmpSearchThread: Searching for near-miss points.

yakra:
NmpMergedThread: Writing near-miss point merged wpt files.

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