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And is faster than SBCL.

Source? (A quick search turned up nothing for me)

https://github.com/drujensen/fib sbcl on my mac m1 gets 21s Gerbil gets 16s

Minor Gerbil version as an example. (export main)

(def (fib n) (if (fx<= n 1) n (+ (fib (fx- n 1)) (fib (fx- n 2)))))

(def (main) (display (fib 47)) (newline))

Compiled with gxc -O -exe -o gerbil.fib