iPhone 6 Plus and iOS 9 major lag

Hello!

I just wanted to check how many of you have a bad and not stable/laggy experience with iOS 9 on your newer devices (iPhone 6 and 6 plus)? After I updated my phone a week ago, my phone feels like it was made at least 5 years ago performance wise. EVERYTHING is laggy. From scrolling, writing, opening and closing apps, animations, to the worst lagfest of them all - the new appswitcher. How is it possible that such a new device, iPhone 6 Plus, performs in such a horrible way with the new iOS? Do you guys know if Apple has acknowledged this problem? I can't seem to find anything online stating this fact except for same threads as mine. This is not acceptable in any way, shape or form. We've reached all the way up to iOS 9 and Apple should not release such a poor excuse of an iOS to the public in such a manner. Furthermore this problem doesn't seem to be exclusive for the phones as I am experiencing exactly what was mentioned above on my iPad mini 2.

Does anybody have some insight into this problem?