I'm not sure the problem described initially is the same as the problem with the lag introduced by the software update (wibbles and dackelone posts). I had this problem before and looking the videos showing the "software update lag" I can say I don't remember experiencing such strong lag before.
Maybe TX135 can confirm but what I experienced was "nothing happening for 1 second and then as I press the pedal more to get it moving then it unleashes the power". The engine was not responding *at all* for one second, that's why I think the two issues are not linked. Just my 2 cents