Could you describe your audio output, hardware, and DSP used?
One possibility is that you have set the primary buffer size too high in Options > Audio. With a fast computer like yours, use WASAPI - Event Style or ASIO with a 50ms or less buffer.
Another possibility is that you're using a third-party DSP that adds a delay.
You can also configure for external hardware latency using Options > Video > Advanced > A/V sync correction.