Ensure WiFi is On and connected.
If your device is in Airplane mode, WiFi will not work.

In your browser (Chrome, Safari, Firefox, etc) try running a speed test from one of these sites:

    www.megapath.com/speedtestplus/

    fast.com/

    speedtest.net

For optimum Wifi performance,

• be close as possible to the Wireless Access Point,
• reduce the number of walls or barriers between the computer and the WiFi AP/router,
• the WiFi AP/router should be 4 or more feet off the floor to reduce barriers,
• you might need a new router or the router might need a software update, especially if it is several years old. To update your router, either contact the manufacturer or if your router is a rental from your Internet Service Provider (Comcast, CenturyLink, Wave, etc), you might be able to simply exchange it for a new or updated model.

A wired network connection is typically many, many, times faster than a wireless connection.