The consistency angle really shouldn’t be overlooked. Performance is nice, but slow and consistent can still be planned for much more easily than inconsistent.
That was the big aha moment about Rust for me when I pushed out my first project using the language. Being nervous about it I had added way too much instrumentation so that I could know how every bit of it was responding to real traffic. But as soon as I started seeing the data, I was convinced that my instrumentation code was broken. The graphs I was seeing were just so...boring. Straight lines everywhere, no variation...after 24hrs, the slowest response (not P99...literally P100) was within 75ms of the fastest response.
-- tablair @ Reddit - Dive into anything
(Especially that "But as soon as I started seeing the data, I was convinced that my instrumentation code was broken.")