After applying and not closing the window, there is no problem. Since that, I get no noticeable input lag at a msec value of 25 (lower breaks with horrible input lag, higher obviously increases input lag because, well, its a delay), however the input lag comes back if I close the Audio Settings window. This was the same in PD, until I opened Audio Settings in PD and started, gradually, nudging down the delay (msec) value.
I have a USB MIDI keyboard which, in any program, has huge input lag, making it unplayable (we're talking quarter of a second here, which is huge in timing terms).