After a day optimizing ASTs, Magnolia now gets approximately 12x better compile-time performance for typeclass derivation than Shapeless!
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Did you manage to deduplicate ?
Yes. For starters, I was generating the code for every typeclass twice. 
But I also reduced my anonymous class count.
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And managed to reuse typeclasses repeated in the same case class. Would be nice to deduplicate across case classes, but I'm not there yet.
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deduplicating might not be trivial & cost a lot... that will be some kind of compromise certainly...
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