For most circumstances, slow Internet (or dropping Internet) can be caused by multiple reasons. Therefore, I suggest you run the below diagnostics:
Confirm your ISP service
You signed a contract with your Internet service provider (ISP), which has a promised max speed rate. Check if your ISP supplied the bandwidth in full. It’s easy, remove the Speedefy router, run the speed test with the modem router directly.
Place your router in the center position of a room. The antennas should be upright position. Keep away from devices that have electromagnetic radiation, such as refrigerators, microwave ovens, electric heaters.
Avoid thick walls
The WiFi can walk across walls but is not too thick. If the walls are concrete, the speed will be declined no doubt. We suggest you add WiFi extenders to the router. (Speedefy products supports AP mode that enables the router to work as a repeater)
Check the ethernet cable
When you connect the modem to the Speedefy router, use the ethernet cable provided by Speedefy. Or purchase a separate Cat 6 or 6e cable.
Are there background downloading activities? Eliminate them
If many devices connect to the router simultaneously, Speedefy router will put “balance” in priority, not “max performance.” So when you need a higher speed on a specific device, it is essential to kick out less important connections.
Connect to 5GHz
All the Speedefy routers are dual-band. Therefore, do not enable “Unify WiFi” on the router so that you can create separate WiFi for 2.4GHz and 5GHz. On 5GHz bands, the speed is usually higher than 2.4GHz.
Does your device support WiFi 5 and WiFi 6?
If your connected device is old, it may support fewer protocols. For example, back in 2015, most PCs and mobile phones only supported 2.4GHz WiFi 4. If you are using an ancient device, consider replacing it with a newer model.
Update your network adapter drivers (For Windows PC Users)
Update your network adapter driver will keep your adapter performance up-to-date: Type Device Manager in the Windows search box and click on it to open it. Then, please scroll down the list below to find the Network adapter segment and double-click to expand it. Double-click the network adapter driver to open the Properties box. You will see a button for Update driver which you need to click.