Ive been on here complaining about how slow my HR21-100 has been running. After doing all the tweaks on here and not much help in the speed area ! Finally found out what has made mine sloooow down ! I have a Slim5 dish on my system. This past week I took my reciever to a remote location and used my portable 18" Dish with only 1 LNB on it. WOW what a difference ! I can scroll the guide with lightning speed NOW ! Last time i used my portable was on a standard reciever, never on a DVR. So its either the extra 4 birds its picking up or the HD is what is slowing down the HR's on here. And my single LNB has 2 outputs so I still can use both tuners but NO HD But at this improvment of speed ! I can live with out HD for a much faster machine !