>Most truly high-level languages, like LISP (which was mentioned directly in TFA), are interpreted, and the interpreters are almost always written in C. It is impossible for an interpreted language written in C (or even a compiled one that is converted to C) to go faster than C.
Completely not true. To start with Lisp is usually compiled.
For more on the topic see: "How to Make Lisp Go Faster than C"
http://www.lrde.epita.fr/~didier/comp/research/ver na.06.imecs-slides.pdf
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>Most truly high-level languages, like LISP (which was mentioned directly in TFA), are interpreted, and the interpreters are almost always written in C. It is impossible for an interpreted language written in C (or even a compiled one that is converted to C) to go faster than C. Completely not true. To start with Lisp is usually compiled. For more on the topic see: "How to Make Lisp Go Faster than C" http://www.lrde.epita.fr/~didier/comp/research/ver na.06.imecs-slides.pdf