I’ve only seen a handful of people use it for local development but I’ve seen plenty of people use it for servers in production. Look like the latest cpython has a JIT built in. It would be cool if it saw the same gains that ruby did.
Looks the the one at that link does unless there's some newer versioning thing I'm not aware of. The top results seem to be comparing pypy 3.10.14 and ruby/yjit 3.4.1.
Not only, you are missing Vignete, and our own Safelayer (yes I know it isn't public).
However exactly because of the experience writing Tcl extensions all the time for performance, since 2003 I no longer use programming languages without JIT/AOT other than for scripting taks, or when the decision is external.
The founders at our startup went on to create OutSystems, with many of the learnings, but using .NET instead, after we were given access to .NET during its "Only for MSFT partners eyes" early state.