Apparently there was a competition called the Highload Cup where contestants submitted a web server implementation in various languages. That web server was then subjected to lots of concurrent client requests. Entries were judged on correctness of their results and also on their response times.
Turns out there were a few Rust entries but none of them ended up anywhere near the top. With the caveat that slow software can be written in any language, I must say it’s a bit disappointing that no Rust entry shined here. As has been discussed on this forum and elsewhere, Rust needs these types of wins (and/or “killer projects”) to make selling it easier.
Did anyone here participate in this contest or know any more details beyond what’s in this Reddit thread: https://www.reddit.com/r/rust/comments/6z7o6e/rust_showed_quiet_poor_results_on_highload/
Someone’s experience participating is detailed here: https://www.reddit.com/r/rust/comments/6zdvza/my_experience_participating_in_highload_cup_re/
I think this comes back to the “what does Rust need for the server” topic.