Lag latency caused by a Discord setting

Hello Legends, 

I have decided to share something I resolve myself, but that might help many more.

You see, I usually play with friends voice chatting in Discord, and I noticed something.

When I use Discord actively, I have lots of latency, lag, spike, rubberbanding. I notice it when I played a couple of game with them, then I played a couple when they both went to eat, and continued when they came back. The "solo" games I played were lag free, but as soon as we entered King Canyon together, the lag came back.

After searching I found nothing, I look into discord setting and found this, turn it off, and OMG a bit chunk of network lag disappeared. I still have some spike at the starts of a match, but nothing like I had before. 

In voice, Turn off the quality of service high packet priority.