Ty is a new type checker and language server for Python, implemented in Rust. Users are experiencing significantly faster performance compared to traditional type checkers like mypy, with some users reporting a time reduction from 18 seconds to just 0.5 seconds for checking large projects. This performance boost is attributed to Ty’s innovative implementation in Rust, which also offers a way to leverage the uv tool for quick testing without installation. Users are expressing excitement over the potential of this tool, especially given the shortcomings of existing type checkers like mypy.