> Note in particular the huge delta between rust 1.92 and nightly. I'm gonna guess that's down to the autovectorizer having a hole that the implementation slipped through, and they fixed it.

The benchmark also includes startup time, file I/O, and console printing. There could have been a one-time startup cost somewhere that got removed.

The benchmark is not really testing the Leibniz loop performance for the very fast languages, it's testing startup, I/O, console printing, etc.