Yesterday RustRover became so unresponsive that the UI would freeze for more than 15 seconds (as reported by their exception notifications) and completions would take 5 seconds to appear and be wrong or lacking most times.

I was seriously doubting the internal Rust engine (they don’t use rust-analyzer or LSP), so I switched to VSCode with the rust-analyzer extension, and the same happened there too, although no freezing. Turns out some of my types were 80k characters long, and ‘cargo clippy’ was taking ~900 seconds of one core pegged at 100% for rustc. Oops.

Now I know what they mean when complaining about super long compile times on Rust, and I wasn’t even doing async :)