Will it slow down my iphone 4s device if I update to ios 8.4.1?

Iphone 4s, ios 6. Sometimes safari crashes, sometimes apps crashes?

Added (1). I want to update and I think I will, but even if it slows down it won't break or anything will it?

4s has been slow since iOS 7. I suggest staying on that iOS if you have a 4s.

It will slow down but it doesn't break anything, if you want iOS 8 features including the new(ish) emojis then I say upgrade

It may, though I'd rather the latest version.

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