Motorola Flipside :: Loads Texts/contacts Slowly?

My 3-month-old Flipside loads text messages and my contacts very slowly, to the point where it can take in excess of five minutes to create and send a text. I know the problem isn't too many texts in my inbox, since I delete them frequently & usually only have one or two brief conversations in them. When I start typing a contact's name in the sender box, my phone doesn't automatically search my contacts for autocomplete (or does so very slowly), even if I hit the OK button, which has occasionally sped up the process. Therefore, I have to go through my contacts manually & send the message from there. But this is still a problem, since my phone loads my contacts slowly, also. I do have a lot of contacts, probably around 800, because my phone is synced to my Facebook & Twitter accounts. However, I can't un-sync them because then I can't have Facebook or Twitter on my phone--there's no way to have site access without syncing my address book. This is getting to be very frustrating & super inconvenient.