Issue #19596 has been updated by k0kubun (Takashi Kokubun). Can you try turning on GC metrics? https://docs.newrelic.com/docs/apm/agents/ruby-agent/features/garbage-collec... ---------------------------------------- Bug #19596: Decreased performance after upgrading from ruby 2.7.2 to ruby 3.2.2 https://bugs.ruby-lang.org/issues/19596#change-102752 * Author: silva96 (BenjamÃn Silva) * Status: Open * Priority: Normal * ruby -v: ruby 3.2.2 (2023-03-30 revision e51014f9c0) +YJIT [x86_64-linux] * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- I just upgraded to ruby 3.2.2 from 2.7.2 in one Rails app in production. Tried with and without YJIT, but no matter what, I'm having worst performance. Time spent in ruby went from 20ms to more than 50ms and very inconsistent (peaks) - I'm using RVM - I've set MALLOC_ARENAS_MAX=2 I may be wrong, but I suspect I have worst performance because I see this chart in newrelic increased right after the upgrade  In the picture, the chart has the "ruby" toggle, to see how much time is spent in ruby operations. But I don't see a noticeable impact on the overall response times. So that makes me think that maybe, ruby 3.2 reports differently than 2.7 in newrelic  Right now, I'm using YJIT, and I was expecting to see some kind of improvements in app performance upgrading from 2.7 to 3.2 YJIT, but there's no performance gain, is that even possible? The website is https://profe.social, it's a very standard content site, no super expensive ruby computations, most operations are rendering erb views pulling data from the database. Any Ideas how can I get performance improvements? Best regards. ---Files-------------------------------- clipboard-202304130005-opyyk.png (120 KB) clipboard-202304130014-vnb0h.png (134 KB) -- https://bugs.ruby-lang.org/