Yes that's a pulseaudio issue. If you search pulse audio crackle you should find some tips. Something to do with some settings on delay I believe.
EDIT:
Also want to mention that for me, it was a USB port issue.
I have the same issue occasionally
If this happens primarily in games, try passing PULSE_LATENCY_MSEC=50 via your launcher and play with the number. I use like, 400?
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