How many software upgrade of IOS should you do before you notice a slowdown?

I have a iPhone 6S. Before I had a iPod touch originally running IOS 6. Then I had IOS 8 on it and it became horribly slow to the point where the keyboard presses always lag.

I would suggest you watch the forums etc after the new versions come out.

If you currently have iOS9 on your phone, do all patches for iOS9.

When IOSX comes out, I'd wait and see what it does to everyone elses iPhone 6s.

I've got an iPhone 6 and it's running iOS9 with no apparent slowdown. It shipped with iOS8. IOSX may be another story altogether.

It's probably some other **** you have on your I-phone that's making it slow. Slow caused by upgrade? Ridiculous

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