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Crystal is nearly at 1.0 and seems way faster than Ruby in addition to having a Ruby like syntax, i'd suggest you take a look at it, promising stuff there.
https://crystal-lang.org/
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https://github.com/rubyomr-preview/rubyomr-preview
It hasn't been worked on for 3+ years now, but its an alternative to using MJIT.
You'll need to need to write most of the C function calls back into Ruby and have the JIT properly inline them to get equivalent performance.
You won't get an immediate jolt of performance but over the long tail, it will catch up.