[m12k]

I maintain a 4 year old rails code base. I'm not going to be porting it to Crystal - but if I had an easy way to get ~5x speedup of the most performance critical parts of my code, I would jump at the opportunity. I'm glad someone is working on this

[pjmlp]

In that case, why not JRuby or TruffleRuby?

4 year old Rails is probably fully supported on them.

[bauerd]

TruffleRuby cannot run real-world Rails yet. JRuby does not always yield the perf improvements one would expect

[pjmlp]

Fair enough.