If you have the notification sound enabled for when transmog is removed from your collection and you have multiple items removed at once the notification sound plays all at once for each removal times and overlaps itself. This is especially bad with 9.1.5 because when swapping out of a covenant you haven't fully leveled to 80 renown you will lose all of the transmog from that covenant. This can easily be 30+ pieces of transmog. The notification sound plays at the same instant for every single one of these removals and it creates a horrendously loud sound that I just take off my headphones to avoid hearing.

If some sort of cooldown could be added to how often this sound plays (even just limited to once every 5 seconds would eliminate the overlapping), or some other solution to address this problem, that would be appreciated.

Also, while I haven't tested, I presume this issue also affects the other notification sound settings.

Yea there's apparently no sound cooldown on removed appearances. That's pretty easy enough to add. I also have some idea to clean up the logic there now that I have a repeatable way of immediately removing tons of appearances all at once to test it out. Should be able to get rid of most of the lag in this case as well.