> If they were ok with it being 2-4x slower, they would just write ordinary Python or Javascript.

Python and JavaScript are much more than 4x slower than C/C++ for workloads that are git-like (significant amount of compute, not just I/O bound)

> C (and C++) are fundamentally important because of their use in performance sensitive contexts like operating systems, browsers and libraries

That's a fun thing to say but it isn't really true. C/C++ are fundamentally important for lots of reasons. In many cases, folks choose C and C++ because that's the only way to get access to the APIs you need to get the job done.

Yeah I suppose that’s the real question - what is the size of the target market of Fil-C? I believe it’s a small % because many C applications are performance sensitive. You say performance is only one consideration among many so the % of C applications that would benefit from your compiler are much higher.

You’re the guy actually building this, so you would have talked to potential customers more than me. You’re more likely to be correct, but I would be interested to know what these applications are.

Also, do you hope people pick Fil-C for a new code base over other performant GC languages like Go, Java and C#? These have less than a 2x overhead for CPU bound tasks.