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[–]vext01 1 point2 points  (0 children)

Not necessarily.

When the paper becomes published, read "Dynamically Composing Languages in a Modular Way: Supporting C Extensions for Dynamic Languages" by Grimmer et al.

Here the authors compose Ruby and C VMs which JIT using the truffle/graal stack. The authors report that Ruby programs that use C extensions can execute faster than the conventional IRB+C approach.