I recently got my friend into minecraft, and wanted to play Realms with him. As soon as he joins the realm, his entire internet lags out, not just minecraft but also discord gets ping spikes, he's unable to watch youtube or use instagram. As soon as he leaves the realm his internet goes back to normal. We live 5 minutes away from eachother. He also gets the same problem when joining any server.
Any help would be much appreciated.