I have a different model (A8 Star- for the Asian markets. you won't find it in Americas or Europe) but yes, the pie update ruined my phone too. The Soc is SD660 and 6GB of RAM so hardware isn't the problem. Oreo ran perfectly. Factory resetting/cache wiping etc did not make any difference to the lagginess of Pie. It would work well for a couple of days and then start extreme lag again. The only solution was flashing Oreo with Odin. Knox didn't intefere with anything...the phone is back to Oreo now and works very well, although Swipe To Capture doesn't work after Odin flash for some reason. Odd. Anyway, my point is that this is a universal problems with Pie. Even OnePlus and Pixel users are having the same issues. Google messed up big this time. I really hope Google/Samung releases a bug fix for OneUI so that we can get the latest updates without rendering our phones useless.
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