It is still no where near the level that Twitter would have stayed with Ruby though. Although I believe TruffleRuby being 3x faster than current CRuby is only the beginning. JVM got tons of improvement in the past 10 years as well it is uncanny.

Although Dr Chris Seaton mentioned it is not his goal to have Shopify Rails running on top of TurffleRuby. Not sure if he meant it was short term or long term. I think Dr Stefan Marr will be joining him soon, and Dr Maxime Chevalier-Boisvert is leading a team working on YJIT in Shopify. ( Did Shopify just hire all known Dr. working on Ruby performance )