>> Because it’s so expensive, and because we have a no regression policy for >> performance, I don’t think there’s a way to land this change in pieces. It >> has to be a mega-patch, so we can test its performance as a whole. > > Were you able to quantify anything additional about the performance > regression on Intel, for instance, if there were any types of String usage > that were particularly hard hit? If not (or you haven’t tried), do you think > there are any metrics we should look into gathering that might help pin point > where things could maybe be optimized? Ideally we would be able to identify > places where we unnecessarily ref-deref StringImpls where either a move or > judicious use of StringView would work just as well.
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