For online competitive games, increasing the TcpAckFrequency to 1 can significantly reduce ping by forcing Windows to send a confirmation after every packet rather than waiting for multiple packets.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile Network & Latency Optimizations
Windows sometimes limits non-multimedia network traffic, which can impact online ping. Setting NetworkThrottlingIndex to ffffffff (Hexadecimal) removes these limits for maximum throughput.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\[Your Interface ID] Feature Deactivation for Lower Overhead
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Games