[yatac42]

> it's conceptual slow because of the language (types, implicits, ...) and it's accidentally slow because written in Scala (a slow language) on the JVM (slow startups and warmups)

Do you have reason to believe that the accidental part matters to any significant degree?

I mean, C++ compilers are notorious for being slow and most of them are written in C++, which is one of the fastest languages around. It seems to me that, if your language is conceptually slow to compile, the fastest implementation language in the world won't fix that problem for you.

On the other hand, if your language is conceptually fast to compile, a slowish implementation language won't hurt much (I've never heard any complaints about the speed of `javac` for example though I've heard plenty of complaints about the speed of Java in general).