As a rule, the average user of the Internet, choosing a provider is interested in not so much the speed that he is ready to offer for a certain amount of money as the possibility, for example, listen to music, watch videos, communicate in social networks. Few people even think that the provider can be "probed" by writing the contract for the provision of not quite the speed of the connection that receives the user.
It happens this way. The provider indicates an upper threshold that is the maximum speed that can be when you connect to the Internet. The question of what values it may fall, for example, under certain weather conditions, it is not. Currently, however, users should be developed services that allow absolutely free to test the connection to your personal computer to the Internet. It should be noted that the speed of the Internet connection varies during the day, what her values can have very large scatter. In regard to the reliability of the information is necessary to test the speed several times in a span of 1-2 hours. In addition, when running a single program, you have to disable all running programs, for example, to stop the transfer of files through different torrents off Internet TV and radio and close all browser tabs or browsers running. Such online services include speedtest.net ping.lv.
There are also programs to test the connection speed, operating on a different principle. DU Meter, for example, operates in the background shows the speed of information transfer, as well as the speed of the Internet connection, all programs connecting to the Internet.
Thus, you will always have current information about what the speed of your Internet connection.