At ScyllaDB, we've been working hard to develop and improve the scylla-rust-driver. It’s an open-source ScyllaDB (and Apache Cassandra) driver for Rust, written in pure Rust with a fully async API using Tokio. You can read more regarding its benchmark results and how our developers solved a performance regression.
In different benchmarks, the Rust driver proved more performant than other drivers, which gave us the idea of using it as a unified core for other drivers as well.