What is the real utility of QoS ?

[Nighthawk Pro Gaming]

Hello,

So I just setup the router with 2 computer connected. I was looking into the QoS option so I did a test with my main computer at 99% computer and the second at 1% of bandwidth and I started download something on the computer with 1% of bandwidth but it still use the totality of my bandwidth and that makes a big lag while i am playing even with 1%  o.O

 

Does that is normal ? Or i didnt undertand how work QoS

 

 

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