Perhaps i found a piece of the Puzzle of the Audio Bugs and Microlags in the Game.

dpc latency hotfix when

What that? I'm seeing it in every thread.

Check for your highest reported DPC routine, it's guaranteed to be the Nvidia driver and it could be as high as 2500 microseconds.

Why this matters? Because when a part of your system lags out this long, it can causes issues with processing other real-time data like especially audio. These long DPC spikes cause system wide pauses which can make sound pop/click/crackle/distort. It's a known bug in the drivers/hardware with Nvidia and people who are sensitive to these audio issues hate it and want it fixed.
Perhaps that's also an cause for that. So if it's true then some FFXIV Dev could force override this "waiting for nVidia DPC Spikes" Bug to ease the chain reactions

Source: https://www.reddit.com/r/nvidia/comm...version_53609/