When iTunes is downloading podcast updates & apps etc each day, it seems to use all of my bandwidth meaning I can't use Safari, check emails or send or receive any other data until it is finished. Usually it takes about 20 mins to get them all. My other Macs also can't do any data over my wifi network until the downloads are complete. Is there a setting to limit how much bandwidth iTunes uses or cap the download speed? Can't seem to find anything to do it. Am I the only one with this problem?