Been running iOS betas on my primary device since around iOS 8 or 9, and never really experienced any super annoying bugs until the 11 beta, which made me question if I really wanted to run betas on my phone ever again. But, my impatience gave out and I upgraded to the 12 beta, and it was like I had a new phone.

Updated to the GM a couple days ago and my 6S is running as good as the day I got it. Super happy with iOS 12 currently.