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Both my wife and I have three year old 5Ss, but our experience with iOS 11 has been completely different. For me it works just as well as 10, maybe even slightly better. For her it has turned her phone into a complete dog, even opening a contact in Messages takes seconds.

Recently her battery has started to show signs that it is wearing out, such as jumping instantly from 5% to 30% when plugging it in to charge, so it looks like this behaviour is a software 'feature' on all iPhones.

I have a five month old SE, works great. None of the issues which plague my friend's 6s.

Can't comment on long run performance. I can say I've never heard it mentioned in these threads. I'd google SE battery throttling specifically though.

I have an SE, nearly 2 years old and I didn’t notice any difference in performance with iOS 11, only improvements in the UI. Definately nothing as described by iPhone 6 owners which makes me think this is specific to certain devices.