Hello WindowsMillenial. If you've noticed any internet slowdown all over your home network, this is most probably as a result of non-uniform bandwidth distribution. Some of your newest or most capable systems may have a few very, very good network adapters making them act as traffic hogs, followed by older systems. I would also look into background processes on your windows systems since I have seen many people use various types of software at once on regular windows installations. The problem with all of this is that Windows OS's themselves do not assign Internet Access priorities, so it is quite simply a matter of your router not being able to manage its traffic. In your case, you’ll want to gain access to the router’s admin-interface.
You can most likely do this by going to your web browser and entering 192.168.0.1 or 192.168.1.1 into the address bar. Once you’ve accessed your routers admin-interface, you will want to enable Quality of Service (QoS). The QoS function allows you to set limits of bandwidth or setting priority levels for each device based on mac address or host name. This will ensure fair access to all computers within the network. You may find on computers running older Windows OS, such as Windows 7 and Windows 10 32-bit, benefits from updating the network drivers for performance and compatibility improvements.
Best regards,