Wi-Fi routers take turns communicating with devices, so they compete for limited antenna time. Because older and slower devices need more time to communicate, they can greatly slow down the overall performance of your Wi-Fi network.
How to resolve it
For optimum Wi-Fi performance, it’s useful to use the latest devices equipped with cutting-edge technology.
You can also disconnect your devices from the Wi-Fi network when you’re not using them and, using an Ethernet cable, connect fixed devices that are frequently used, such as your smart TV or your game console.