Turbopack in 16.3 now reclaims compiler memory during extended dev sessions instead of quietly eating RAM until you restart. The persistent cache means successive production builds skip work that hasn't changed — a meaningful difference on larger codebases. The Rust React Compiler port accelerates compilation without requiring a separate Babel step. The `import.meta.glob` addition is the quiet win here. Vite projects that relied on glob imports can now migrate to Next.js without rewriting that particular pattern. That's three Turbopack quality-of-life releases in two months, which suggests the team is working through a real backlog rather than shipping opportunistically.