You should be getting audio from hdmi passthrough anyway. Watch and play from whichever TV/monitor the passthrough is connected to, and on PC side you can just mute it so you don't have to hear delayed audio.
The reason why you're getting additional delay like this is because intercepting the hdmi signal and sending it through USB in a format that the computer will understand adds extra overhead. Passthrough doesn't have that overhead, it just sends hdmi signal directly.
The reason why you're getting additional delay like this is because intercepting the hdmi signal and sending it through USB in a format that the computer will understand adds extra overhead. Passthrough doesn't have that overhead, it just sends hdmi signal directly.