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If your wireless connection is experiencing significant lag, then you may need to connect to a wired connection (usually through Ethernet) in order to boost your Internet performance speed. Sometimes, routers or other devices that can access wi-fi may need to be restarted in order to fix any performance issues caused by a glitch or broken connection. In order to check if the problem is a network or just your device, connect to another network you have access to and check that network's Internet speed. In some instances, a slow Internet speed could mean your device is being slowed down by malware in its system. To remedy this, install an antivirus program with a malware scanner included in it.
Switch to a wired connection. Restart your Wi-Fi access point. Connect to another network. Run a malware scan on your device.