OK, I have had an iPhone 4 since day 1. Before that I had an iTouch 2g, the iPhone 3GS, now this. Each has been restored from the back up of previous device. I have started to notice my iPhone 4 is very slow compared to other iPhone 4's, jumping in and out of folders, how long it takes to quit an app etc. I was wondering if this is due to the amount of times I have restored it from backup. Does the previous device leave behind useless trash? I would prefer not to do a new device restore since I would loose everything (texts, game progress etc). I was wondering if anybody else experienced this and how they fixed it. Comparing my iPhone against another is shocking to see the speed difference!