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Re:Ruby 2.6.0-preview2 released with JIT by funkaster on Sunday June 03, 2018 @03:44PM (#17221348)
Yes, I agree with this. We use Sinatra + Sequel, but run our code using JRuby mostly because we're sharing some scala libs with other teams. In any case for us, performance has not been a problem (~20k req/min with one node). I'm really looking forward to ruby 3x3 :)
Re:Ruby 2.6.0-preview2 released with JIT by jashmatthews on Sunday June 03, 2018 @03:50PM (#17221387)
JRuby is really hitting its stride now, becoming ~3x faster than CRuby in my testing. The JVM changes to support more dynamic languages have improved performance so much.

Charles Nutter's early tests using JRuby on the GraalVM sound like there's another big step in performance coming without a huge amount of work.