It's not specific to the wireless keyboards - I've tested this with dozen various keyboards (bluetooth and wired USB ones) and the lag is clearly there comparing to using the same keyaboards on PS3. At least the issue with "loging into PS4" account seems to be fixed with latest PS4 firmware. It's pretty annoying as many times you either miss "/" at the start of the command or some important letter(s) in the actual command (leaving asside looking like twat who can't type). The most "comical" situation is when I try to /bow to my customers and run /ow instead ... :P