Will updating my iphone 4 from ios6 to ios7 log me out of my apps?

Guest

I want to update but i'm scared it will log me out of my instagram and i forgot my password -.

livlyf

Then go ahead and update

Will updating my iPhone apps affect my phone speed as how updating the Operating System (OS) will? Currently I'm using the iPhone 5s on iOS 8.3 I know if I were to update my phone to the latest OS I may notice some slowdown on my phone's performance, since it may not have the "muscle" to handle certain functions. Many apps now are optimised for iOS 9 and/or the 6th generation phones. Will my 5s' speed performance slow down if I update my apps? Will the app's performance slow down?
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