You can enable YJIT and get a ~30% speedup by passing an extra environment variable to your Docker container. Moving away from CRuby to an alternative Ruby is a lot harder than that.
Also Oracle.
Also Oracle.
In what way? Truffleruby passes over 97% of CRuby's specs and it runs on my command-line without any problems so far. It was easy to install too. I'm sure if I dig into those failing specs I'll find something but will it be important? I'd love to know.
> Regarding performance, TruffleRuby is by far the fastest Ruby implementation on the yjit-bench benchmark suite which includes railsbench, etc. To achieve this performance TruffleRuby needs a fair amount of warmup, as other advanced JIT compilers do. If you find any performance issue, please see this guide.
One benefit of YJIT + cruby is it doesn't have the same warmup costs. If you're deploying many times a day, this JIT warmup becomes a dominant factor.
Very little of Graal/Truffle is locked behind an oracle license. The community edition is FOSS and within 5-10% of the performance of the paid version (so still an order of magnitude above MRI with or without YJIT). The situation is very similar to HotSpot/OpenJDK.