Chris covered this pretty well, but you'll notice in my post and in the slides from my RubyC talk (https://speakerdeck.com/headius/the-year-of-jruby-rubyc-2018

Chris covered this pretty well, but you'll notice in my post and in the slides from my RubyC talk (https://speakerdeck.com/headius/the-year-of-jruby-rubyc-2018 https://speakerdeck.com/headius/the-year-of-jruby-rubyc-2018) I usually include CRuby + JIT from this year in the results. It rarely helps more than a few percentage points, even on numeric algorithms, so I'd say it's too early to claim anything about it.