With the range extender, you may find that Wi-Fi signal is stronger but download speed becomes slower. Why is that? There are many reasons for this, please follow the steps below to find a solution.
1). It’s recommended to set different SSID/Wi-Fi name on Range Extender from your host network, then it's easy to know which Wi-Fi the client device is connected to.
2). If only one device (laptop or phone) has the low-speed issue, please contact the device support.
3). Please do the speed contrast in the same Wi-Fi band (2.GHz or 5GHz) for the Range Extender and router. Normally, 5GHz Wi-Fi has higher speed than 2.4GHz Wi-Fi.
Step1: To avoid interference, place Range Extender away from some devices, such as cordless phone, Bluetooth device, microwave, or other large electrical appliances.
Step2: To avoid poor signal, get Range Extender close to your router, and also move client devices close to Range extender. Normally, it’s recommended to plug your extender about halfway between your router and the Wi-Fi dead zone.
Step3: Please check the link speed on your device by referring to How to check the associated/link speed on a wireless client.
Step4: Please do some speed tests as the following ways.
1). Connect only one end-device to the range extender. Do the Speedtest® (www.speedtest.net) without doing any high bandwidth activities. Take a screenshot of the speed test result.
2). Connect the same end-device to your router at the same location. Test the speed (www.speedtest.net) without doing any high bandwidth activities. Take a screenshot of the speed test result as well.
Step5: Please start a new thread for further help with the above screenshots if the speed is still not as good as expected.