This is funny stuff here. My 6 plus and 6 NEVER choked on iOS 9. Hell my 6 plus is what this was posted on in real time, no lag.
If your phone is freezing or too slow, take it out of the freezer
Spoiler alert - your eyes can't see it.
Interesting response. So the problem is there but just cant "see it"? So why would it matter if its there then? Thats sorta kooky logic if I do say so. "I know you think your phone works fine but trust me it doesn't. You just cant see a problem with it."