I'm having the same issues as described by everyone. It is really horrible. I'm on single SIM by the way. Temporary solution to lighten things a bit: If you're using Facebook and/or messenger, replace them with Facebook lite and Messenger lite. This doesn't solve the problem in full - the device is still laggy - but at least it's okay to use. It made basic functions a lot better and it also significantly impoved the battery life. This is no solution, just a temporary work-around. It is totally inacceptable to use Facebook lite on a flagship smartphone.
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