According to this paper[1] about L4, it seems to be the former (that is, performance has genuinely improved). [1]http://www.nicta.com.au/pub?doc=6930 http://ww

According to this paper[1] about L4, it seems to be the former (that is, performance has genuinely improved). [1]http://www.nicta.com.au/pub?doc=6930 http://www.nicta.com.au/pub?doc=6930