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.