If you have root you can freeze apps you never use and I disagree it doesn't affect the system performance. On a boot up just about every application loads into memory and that's plain stupid, since most of those apps I never ever use. I was actually shocked when I looked at application manager and everything was loaded into memory. It was main reason I rooted my phone, to freeze all the garbage and bloat on my phone. You can also delete some of the stuff, but it gets little complicated if you delete wrong app and then other things don't work no more. I don't know if they load all programs into memory because of "just in time" compiler, another idiotic idea, why compile program once, when we can compile and waste time, every time we start the program. When new, my phone would use about 70% of memory right from the boot and would go to 90% over time, now I freeze just the most obvious stuff and start at 40% memory load. There is a spreadsheet listing all apps, what they do if they can be safely removed, it could help you get better control of your phone.