I feel inspired to start with Lisp after being disappointed with the "open" source scene of 2021. I'd rather pay LispWorks a yearly fee and be left alone than dealing with unbalanced people in the Python space. The free Lisp implementations also look somewhat isolated from the ideological wars.
However, a C interface is required. Is this one the recommended solution? Is it really portable?
https://common-lisp.net/project/cffi/
What is the speed compared to a Python C extension? Are implementation-specific C interfaces faster (I guess they are)?
Sorry for so many questions, but these can usually only be answered by people who have actually used the interface.