While I mostly use Emacs and have only actually written a little bit of Rust, from what I've gathered the two best IDE experiences are either VSCode with RLS (R

While I mostly use Emacs and have only actually written a little bit of Rust, from what I've gathered the two best IDE experiences are either VSCode with RLS (Rust language server, which uses an adaptation of the compiler for reporting syntax errors and various other information like jump to definition, coupled with a simpler but faster engine for things like autocompletion so that you can start doing that before the server finishes a full compile) and the Rust IntelliJ Plugin which uses IntelliJ's native tooling and adapts it to understand Rust, which has the advantage of all being originally written for fast and robust autocompletion, highlighting, and the like, rather than adapting something written as a compiler to provide that information, but the disadvantage that you need to implement a lot of Rust's syntax and type inference so there are some more complicated cases that it can't necessarily handle yet. If you're interested in trying out a Rust IDE, those are the two I'd try and see how you find them.