[belthasar]

The slow keyboard input happens to me on my iPhone 4. I can type a whole text message and not see any of it for 5-10 seconds.

I suspect it has something to do with auto correct/spell check but I haven't tested anything yet.

[blinkingled]

BTW, restoring fresh to iOS7 did not fix it for me. Text kept appearing slowly in the text input areas - long after keypresses. So I restored back to 6.1.3 and all is well again.