Adjusting the TCP Receive Window (RWIN) helps your PC handle larger amounts of data more efficiently over high-speed connections.
TCP Optimizer is a legacy yet continually updated tool that modifies Windows' network stack settings to improve throughput, reduce latency, and stabilize connections. Despite being lightweight (under 1 MB) and requiring no installation, it is incredibly powerful. It provides access to over 50 advanced TCP/IP parameters—including the Receive Window Auto-Tuning, TCP Congestion Control Provider (e.g., CTCP, DCTCP), and Network Throttling Index. tcp optimizer windows 10