which iphone do you have? i have the 3gs, and my messages and apps open very quickly. i also use bitesms for all text messages...i don't even open the "messages" app anymore. if your trial is up, it's ~$8.00 or so for a lifetime subscription. if all else fails, you may want to save all of your apps, clean the phone off completely, then re-install the firmware and apps (and jailbreak) again. maybe that will clean everything up for you. also, try downloading "sbsettings" from cydia, icy, or rock and check the "processes" button to see what you're running. after you download sbsettings, just go to the homescreen and slide your finger across the very top of the screen and the sbsettings menu will drop down and the "processes" button looks like a skull and cross-bones. you can kill all processes that are running that you don't need from there. also, it will tell you how much memory is being used and how much you have available, which will clue you into what processes you need to kill.