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"YJIT currently provides average speedups of 23% over the CRuby interpreter on realistic benchmarks, and near-instant warm-up time. Plans are to include YJIT in the Ruby 3.1 preview release so that more users can test it out and benefit from potential performance gains."

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> YJIT uses significantly more memory when active -- e.g. OptCarrot takes 80MB without YJIT and 350MB with YJIT. This can be adjusted by setting --yjit-exec-mem-size.

This one gave me a worry. I think it can be addressed, but if it can't this whole effort seems a bit overrated to me.

It's always a trade off of time and space, especially for dynamic languages. Glad the flag is there, and it will be interesting to see more real-world data once it's out in the wild.

>No garbage collection for generated code. Will produce an error if --yjit-exec-mem-size is exceeded. This should be fixed in the coming months.

Sounds like at least part of it will be fixed.

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