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Stock keyboard. also typing tends to lag behind. so I finish words well before they finish appearing on the screen. I just restored my iPad and set it up as new device, and I am still seeing this.
 
Stock keyboard. also typing tends to lag behind. so I finish words well before they finish appearing on the screen. I just restored my iPad and set it up as new device, and I am still seeing this.

I see this every once in a while on BOTH my iPad mini 4 and iPad Air 2. I'm thinking it's more of an iOS 9 optimization issue more than hardware limitations since I'm seeing it on my iPad Air 2 too.
 
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