fast.com was created by Netflix to show if your ISP was throttling Netflix traffic. A lot of mobile services (at least in the US) offer "unlimited streaming" w

fast.com was created by Netflix to show if your ISP was throttling Netflix traffic. A lot of mobile services (at least in the US) offer "unlimited streaming" which is really just bandwidth-limited to offer SD-quality streams and offer "HD" (read: less-limited) streaming as a paid add-on.