Adjust the traffic quotas on your router to limit the speed of devices so that the entire network has sufficient access to your bandwidth.
How to Limit WiFi Users' Internet Speed in a TP-Link Router | Bandwidth Control
Before you can limit bandwidth on your router, you need to know the Internet Protocol address of your home router. This address is called the default gateway.
Each router has its own menu system, but the general principle remains the same. Use the IP address or MAC address of each device to control the maximum bandwidth it can use.
In most routers, this feature is called Quality of Service. The location of that feature varies depending on the router you have.
