When resuming video playing on recent linux 5.5.x kernel with recent nvidia driver, audio playback when paused for 5 seconds (the point when pulseaudio suspends the alsa driver inside nvidia), it becomes extremely slow and will hang on a poll() syscall trying to resume alsa. This also requires playing audio over HDMI.
= 5.5 kernel
440.44 nvidia dirver
audio playing over HDMI
using pulseaudio (works fine with direct to ALSA)
Documented here with logs: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/issues/807