If your WIFI have a low speed

1. Check the Wi-Fi signal on the status bar. Make sure that you're within router’s range and can receive the signal of sufficient strength.

2. When connecting to a public Wi-Fi network, network speed might be slow for there are too many users. Try to connect to other Wi-Fi networks and see if you fixed the problem.

3. Clean up the caches and junk files on your phone, and do security scanning.

4. If you are a Wi-Fi network administrator, restart the router.

5. Check with your operator if there are network failures and limits in your area.