[KennyBlanken]

If your device supports it, I strongly encourage you to update. Aside from not getting security updates anymore, which places you at significant risk: the privacy settings in iOS 15 are very good. Even location privacy for system level stuff can be highly locked down.

I have an 8, and iOS 15 doesn't feel "slow", if that's your concern.

[Wowfunhappy]

My concern is indeed that it will be slower, particularly as I have a 6S, which is of course significantly older than your 8.

If Apple allowed downgrades I would absolutely update to try it out, but they don’t.