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Beta Updates Surge Engine Performance • Hysteria 2 and TUIC downloads are faster and use less CPU. Surge now acknowledges received packets in batches. On a 10 GbE test machine, Hysteria 2 went from 2.86 to 3.84 Gbps, with CPU dropping from 137% to 108%. • Hysteria 2 and TUIC uploads no longer send the whole congestion window in one burst, which overran the server and caused packet loss. Several uploads sharing one connection now get a fair share. • QUIC sessions carried over another proxy's UDP relay, such as Hysteria 2 over SOCKS5 or Shadowsocks, now send packets in batches. Their uploads are much faster. • UDP over AnyTLS and VLESS no longer loses most of its upload at high rates. Queued TLS writes are now sent together. • HTTP/3 tunnels (TrustTunnel with h3=true, MASQUE) and SSH no longer spend CPU formatting log lines for every packet. • Outgoing UDP sockets and the SOCKS5 UDP relay now use larger socket buffers instead of the system default, so fewer datagrams are dropped under load. • Opening many tunnels at once through MASQUE, TUIC, HTTP/2 CONNECT, TrustTunnel or VLESS gRPC no longer leaves some of them stalled or hanging. Surge now opens more connections when the server's stream limit is reached. Reliability • When a Hysteria 2, TUIC or MASQUE server stops answering, Surge now notices within about 3 seconds and opens a new connection. Before, new requests kept going to the dead connection, and downloads hung until the idle timeout. • MASQUE UDP associations now survive their QUIC connection being closed by the server. • MASQUE now falls back to 1,200-byte packets for 30 minutes when a connection that started at 1,350 bytes gets no reply. Paths with a smaller MTU can connect again. MASQUE also accepts larger DATAGRAM frames from the server. Fixes • Fixed TrustTunnel HTTP/2 downloads always breaking after a few seconds at full speed. • Fixed Hysteria 2 uploads with obfuscation stalling for good a few seconds in. • Fixed HTTP/3 uploads (TrustTunnel with h3=true) stalling for several seconds when many connections were busy. • Fixed UDP datagrams over Hysteria 2, TUIC and MASQUE being dropped while a large upload ran on the same connection. • Fixed HTTP/2 CONNECT-UDP: • UDP sent faster than the connection could carry piled up and delayed later datagrams by seconds. • Fast UDP uploads lost most of their packets. • Envoy reset the connection during fast UDP downloads. • Fixed TLS-based policies dropping the rest of an upload once the server had finished sending. • Fixed HTTP/2 CONNECT losing the end of an upload when the server finished first. • Fixed Trojan UDP to hostnames failing with sing-box servers. • Fixed a crash with VLESS Vision. • Fixed the Snell server, MTProto proxy and port forwarding failing to restart after a profile reload with "Address already in use". This was a regression. • Fixed a crash when an HTTP API request had a field of the wrong type, such as a non-numeric timeout for /v1/scripting/evaluate. Such requests now get a 400 response. • Snell server and Vector: • Fixed the Snell v6 server dropping IPv6 UDP. • Fixed the Vector server resetting the UDP stream for datagrams to other hostnames. • Fixed Vector cutting the upload short when the server finished first. Surge Mac • The proxy editor now supports VLESS, including REALITY, gRPC and WebSocket. You can also import vless:// share links. Surge iOS Improvements • The proxy editor now supports VLESS, including REALITY, gRPC and WebSocket, and can import vless:// share links. • VMess, TUIC v4 and all Shadowsocks ciphers are back in the proxy editor. TUIC v4 is a version option of TUIC. • QUIC uploads (Hysteria 2, TUIC) on lossy, high-latency networks are much faster. • Downloads over QUIC on lossy networks use less memory. Fixes • Fixed MITM of HTTP/2 for many hosts pushing the Network Extension past its memory limit. This was a regression in recent betas.

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