Having that many messages is causing the slow down. If you go to the messages screen the unit most likely will lock up and you'll have to reboot to get it working again. If you have any programs you want to watch, I'd suggest you watch them and then do a Clear & Delete Everything. This will do as it says, including the messages. Once that is complete (it can take many hours), then make sure you clear the nag messages before you get too many (I'd do it once a month).