Contributed a #ruby #Ractor variant to the programming languages benchmark game: https://salsa.debian.org/benchmarksgame-team/benchmarksgame/-/issues/559
(was an example where Ruby was slower than Python, so got interested :))
Might not be published anytime soon (as the benchark game isn't updated as often anymore, and was only recently updated), and it will also not be the fastest version, but was fun to experiment with Ractors in ruby, a way to have true parallelism is ruby.
(btw the reason ruby is slow in this test is that instantiating an object for a single character is much overhead that can't be reasoned away by the JIT-compiler I guess...