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With the proliferation of streaming services, the variety in format of media has increased. Some services might need greater internet strain than others. Using more devices on the same network puts strain on bandwidth. The first step should be finding the device which is slowing your Internet connection. Block all the MAC addresses which don't match your device. Upgrade your router with DOCSIS 3.1 technology to give a faster speed. Use Ethernet cables like Cat 7 can support a phenomenal speed of 10Gbps.