I also experience a slight lag while typing on my iPhone. It was definitely smoother before the upgrade. Dictation is normal on the iPhone, though. When I switch to English everything is fine. I guess it has something to do with the new auto correction, although this is said not to be active for German, yet. The voice dictation lag is also there for French. Only English is quick and smooth.
No, it is just incredibly slow. I am going to reset the iPad and set it up as a fresh device in a few days. I need the dictation function very often and the current situation is unbearable.