[zmmmmm]

> Frankly, for mainstream development, Kotlin or C# gives very pleasant, productive languages with strong ecosystems without paying such a penalty

If dynamic is important, Groovy is an excellent option - it preserves almost all of the desirable dynamic properties of Python but is by default 3-5x as fast and with trivial effort 10-20x as fast, approaching Java speeds essentially, and with all of the advantages of that runtime (full concurrency, etc).