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If I'm reading those results right, it seems that Ruby was getting slower between 2.6.10 and 3.1.3 with yjit, and can still outperform Ruby 3+ versions without yjit. Does anyone know why this is?

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Yes, there was a bit of a drop off in performance but only when YJIT is not used. With YJIT there are performance gain. Also note that YJIT in 3.1 was still experimental and more proof-of-concept. Only with the 3.2 release was it now deemed production ready.

And YJIT's creator, Shopify, is already using it in production with Ruby 3.2 for all their store fronts!

Small nitpick: Maxime Chevalier-Boisvert is the creator of YJIT and the BBV optimization technique that underpins it. Shopify is the company which employs her and funds its further improvement.

Yes, I know but thought it would be simpler to just say Shopify. Sorry for the inaccuracy.

I'd like to know this from a more informed person as well. My guess is that yjit is only now production ready, they've been building it for a while and enabled behind an experimental flag

YJIT was disabled by default before 3.2

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