[noelwelsh]

There aren't many people looking at these JITs at the moment. Stefan Marr[1]'s group[2] is, I believe, the where most of the research is currently done. A recent paper[3] compares performance of interpreters in RPython and Graal. Their baseline performance is Java, and they achieve performance close to V8, which itself is about 2x slower than Java.

My summary is you can write fast interpreters + get JIT for free, but fast JIT for dynamic languages still means 2x slower than JIT for statically typed languages (and Java definitely leaves some performance on the table due to how it represents data).

[1]: https://stefan-marr.de/

[2]: https://research.kent.ac.uk/programming-languages-systems/

[3]: https://dl.acm.org/doi/10.1145/3622808