I should also have mentioned that I have a `d=nimPreviewSlimSystem` in my
`nim.cfg` which still breaks many things (self tests,
[nimble](https://github.com/nim-lang/nimble/issues/1050), etc.) but which does
make the empty file compile time `1.0779 +- 0.0088` times faster (notably,
quite a bit smaller than the 1.32X from blocking the system `config.nims` which
I never noticed breaking anything). Anyway, both together do multiply out to
`1.5503 +- 0.0069` times faster which can be helpful when riding the
"interactive response" timeframe around 50-300 ms { or I guess 16 ms if you're
more impatient like a 60Hz video gamer :-) }.
