1.Run a speed test.
2.Compare your speed results against what you’re paying for.
3.Reset your network.
4.Check that signals aren't conflicting.
5Check to see if you've reached your ISP's data cap.
6.Call your ISP Support.
7.Check all of the devices on your network.
8.Relocate your wireless router or computer.
9.Check your filters if you have DSL.
10.Check your data cap.