Yeah, as I said above, it's not mostly about the performance¹ but about the bugginess, which is to say, the comprehensibility. There are arguments both ways about whether C or Lisp is more bug-prone (less comprehensible) but I think the results are in. And there are new languages like TypeScript which combine and exceed the advantages of both.
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¹ Though GCC still routinely generates much better code than SBCL, much less the new Elisp compiler, that's not the primary consideration. I'm not sure why you're mentioning it.
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¹ Though GCC still routinely generates much better code than SBCL, much less the new Elisp compiler, that's not the primary consideration. I'm not sure why you're mentioning it.