tl;dr: Discord is replacing its Electron-based desktop client with a new Rust client built on GPUI (the UI framework from Zed), demonstrating dramatically faster cold-start times and ~290MB RAM usage with two accounts signed in versus 1-2GB for the Electron version. Mobile apps will drop React Native and the web app will move logic to WebAssembly, allowing shared Rust code across platforms. Private testing begins soon, with Linux and macOS support confirmed, putting pressure on Electron/WebView2-based competitors like Teams and WhatsApp.