Even more so, iOS 9 brought all the iPad multitasking features and a lot of other large improvements.  In iOS 12 the biggest change rumored is a redesigned stock app...I see a lot more potential for focusing on bugs and polish this time around.
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Get a new battery and do a full restore, I had a customer come in the other day to get a new phone upgrading from her iPhone 5s.  Only reason she was upgrading was her battery life was shot. I used her phone for a minute and  it felt perfectly usable and smooth.  People need to understand that every major update you really should wipe and start fresh.  I get way to many people upgrading their phone because “it’s slow” when they could save a lot of money spending the hour to do a factory reset on their devices.