I hear you, but I was lazy and only gave one reference. There have been, over the years, many demostrations of optimized SBCL being on the same order as C.

https://benchmarksgame-team.pages.debian.net/benchmarksgame/...

https://drmeister.wordpress.com/2015/07/30/timing-data-compa...

https://groups.google.com/forum/?_escaped_fragment_=topic/co...