I'm not familiar with Ruby, but it doesn't seem like TruffleRuby is really competitive with languages known for performance.

These are only simple benchmarks, but do indicate a rough ballpark for TruffleRuby: https://github.com/kostya/benchmarks

As I understand it, Crystal would be a good Ruby alternative if you want performance. This is of course a whole new language designed with performance in mind from the beginning and here is a repeating theme: you need to consider performance at the start, not 20 years later.