This is from the Racecastlive website....
CAN MY COMPUTER HANDLE THIS?
It depends on many factors. MOST newer model PCs with a decent internet connection can handle the stream. It is a combination of your internet connection, having updated software, and not running too many programs. To test your internet speed check at:
www.speedtest.net.
It is recommended that you have a DOWNLOAD speed of at least 1 MBPS (1000 Kbps) or more to properly view the stream