It appears the implementation of Happy Eyeballs in 1.22.0 is the origin of some pretty serious performance regressions that remain even in the latest Hackney 3.0 branch. Connection tests: === 1.22.0 === First call: 9434ms Second call: 14ms === 1.21.0 === First call: 228ms Second call: 16ms We went back further to 1.20.1 though because of reported problems with the mail client and ssl_options. That bug was not reproduced by a dev, though, but we'll trust it for now.
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Downgrade Hackney to 1.20.1
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