I'm downgrading to an iphone 4s. Should I update it to ios 8?

No need to bother me about how I should get a later version of the iphone. My question is this: When I get my iPhone 4s, should I upgrade it to ios 8? I had it for my iPhone 5 and liked it, but I won't upgrade if it makes the iphone 4s too slow.

What say you?

Many tech sites recommend you don't upgrade an iPhone 4S to IOS8.

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