$ time for i in {1..1000}; do /usr/libexec/vyos/validators/numeric --range 1-9999 666; done real 0m56.933s user 0m48.045s sys 0m9.064s
$ time for i in {1..1000}; do /usr/libexec/vyos/validators/numeric --range 1-9999 666; done real 0m44.552s user 0m37.760s sys 0m6.989s
This is a performance improvement of 21%
Running in an ESXi VM with Quad Intel(R) Xeon(R) CPU E5-2630L v3 @ 1.80GHz