Its going to be a combination of two factors, your internet speed and the
server load. If you are hitting a popular station or one with low bandwidth
then you will have delays getting that information, so WMP buffers. If you
have a generally slow connection (all radio stations are slow) then you
might want to consider an upgraded connection to the web if radio is
important to you. Although you would most likley have to be on a 28.8
connection to see these kind of problems.