This depends on why you are having buffering issues. If your buffering issues are because your internet is slow/ISP not able to deliver no. That is outside the house. However if you have a good ISP/bandwidth coming into the house then this can help, as it improves coverage and since MU-MIMO devices are better able to share wireless with multiple devices. You may still need/wish to upgrade the wireless cards to the newer AC ones that support MU-MIMO to get additional throughput but this may help.