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That language is basically F#, except for perhaps the performance claims. But F# is definitely not a slow language.

Matthew Crews has a done a number of videos on high-performance F# and there are some things you can do that give a big boost over the default coding approach.

Why F# for Performance -- https://www.youtube.com/watch?v=EIBRoNEpg6c

F# for Performance-Critical Code -- https://www.youtube.com/watch?v=NZ5Lwzrdoe8

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