Rust's predictable performance lands another strike for the team! 
Even with just basic optimization, Rust was able to outperform the hyper hand-tuned Go version. This is a huge testament to how easy it is to write efficient programs with Rust compared to the deep dive we had to do with Go.
[..] After a bit of profiling and performance optimizations, we were able to beat Go on every single performance metric . Latency, CPU, and memory were all better in the Rust version.
Discord Engineer Jesse Howarth, in the blog post
"Why Discord is switching from go to Rust" (emphasis in original)
This Discord Blog documents tangible productivity benefits, improved performance, as well as platform maturity for Rust, great things for our community to show in 2020!
Also, the more predictable behaviour allowed them to increase cache-sizes without suffering catastrophic GC-spikes, leading to a factor-5 to factor-200 improvement, depending on the metric (the graphs are a bit too low-res to get more accurate numbers).