Per a talk from Joshua Liebow-Feeser at the Rust Belt Rust 2018 conference, Google is heavily using Rust for networking in their new Fuchsia operating system.
This is a rough approximation of a quote he gave during the talk:
"What makes Rust different is not that you can write high-performance, bare-metal code. People use C and C++ to do that all the time. What makes Rust different is that when you write that code, it is safe, clean, and easy to use, and you are confident in its correctness."
If even Google is using Rust for performance-critical development, that seems pretty promising to me.
This is a rough approximation of a quote he gave during the talk:
"What makes Rust different is not that you can write high-performance, bare-metal code. People use C and C++ to do that all the time. What makes Rust different is that when you write that code, it is safe, clean, and easy to use, and you are confident in its correctness."
If even Google is using Rust for performance-critical development, that seems pretty promising to me.