Before iOS 12, my iPad Air (1st gen) was rated at 1 out of 5 performance based on DJI (Best Phones and Tablets for DJI GO (Spark, Mavic Pro, and Phantom)). I tried flying with DJI GO 4 and the constant lag/skipping of the iPad made it impossible to film or to even fly safely. After iOS 12, now I can easily fly with DJI GO 4 and Litchi without any issues at all. I'm glad I don't need to buy a new tablet for flying and actually give props for improving my device in a real world scenario. So if you have a device with A7 processor that couldn't use GO 4 before, maybe now you can!