Hahahaha. Read my post again and you will know that 5c and 5s are completely different devices with different CPU architectures. 5c does not support Metal API while 5s does.
Summary:
5c = 5
5c ≠ 5s
5 ≠ 5s
5 and 5c do not stutter in iOS 9's control center or anywhere for that matter. However they stutter like crazy where ever tables API is used like in WhatsApp recent chats list.
5s, 6,6+ all stutter in control center when it is swiped up beyond 50 % of the screen.
Edit: Saw people have liked your post which is totally ignorant.
Brought a smile on my face.