Here is a web-site with a test to see if your ISP is limiting or what is called throttling your download bandwidth and perhaps preventing you from getting your full use of the Internet Connection you are paying for.
Check it out here:
The stated goal of the project is:
"The goal of the Glasnost project is to make ISPs' traffic shaping policies transparent to their customers. To this end, we designed Glasnost tests that enable you to check whether traffic from your applications is being rate-limited (i.e., throttled) or blocked"