iOS devices slowing and buggy before iOS 7 update?

This sounds silly but over the last week my 4S, iPad mini and my parter's 4S have started reacting very slowly to responding to clicks to open up apps and other stuff like a poorer safari experience. I do the usual like close all my apps to see if that helps but it doesn't.

It's probably just me but does anyone else's iOS device feel slower all of a sudden compared to normal and isn't it a coincidence that iOS 7 download is close?

Not saying that something deliberate is happening ;)