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300ms latency spikes on a particularly pathological production workload are irrelevant for the stated use case of a test email server.

When does one decide whether an environment is a test? I would like to test SMTP notifications of a staging server at work, approximately 15 million emails to be sent. This is NOT production, but those 300 ms spikes would be unacceptable. That Rust rewrite seems to be a godsend.

The GC iterations they were talking about were during incredibly high throughout. Most users would not notice this. It's not some general indictment of Go.

Which is a factor that really does not matter for a test server

The go GC has kept evolving since.