Macbook Pro causing lag on home network

Hello,
I got 2 PCs and a Macbook Pro connected to my Home Network. Whenever the Macbook Pro is connected to it the networks starts to have constant lag spikes.
If only the 2 PCs are connected everything runs smooth. I tried using an Ethernet cable instead of wireless but the problem remains so i guess that the problem is actually something on my Macbook.
Any ideas what can it be? And how to solve it?
Thank you so much for you attention.

Usually, that's because both MBP's are trying to use the same IP address.
However, we need more information, like the type of router you're using.

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Macbook Pro causing lag on home network

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