slow mo keyboard

L.A.

Since I updated to Logos 8, I can‘t make notes anymore on my Android Tablet. This is due to the extremely poor keyboard reaction time (estimated ⅓ seconds per letter). The behavior is the same online and offline. System-restart didn't change anything. I tried three different keyboards (Sony's Xperia-Keyboard, Swiftkey, AnySoftKeyboard). 

(Sony Z3 Tablet Compact, Android 6.0.1)