Stair Speedtest Reborn is a C++ proxy performance testing application that replaces the original Stair Speedtest script with a faster cross-platform implementation. It can benchmark batches of proxy nodes and report network performance characteristics. Supported ecosystems include Shadowsocks, ShadowsocksR, V2Ray, Trojan, and SOCKS5 configurations. Users can run tests through either a command-line interface or a web interface. Subscription results are saved to logs and can also be rendered as PNG reports for easier comparison. The application supports Windows, Linux, macOS, Android through Termux, Raspberry Pi, and experimental mobile Unix-like environments.