GUI is "improved" for newbies only It VERY slowly, most parameters can't be changed rapidly.
Previously I can tune paramers on N-page, press "Apply", tune paramers on N+1-page, press "Apply", ...., press "Finish" & reboot. In new GUI, a little amount of parameters can be changed on-the-fly, but most of them requires reboot like in old GUI, BUT there is no button "Apply", only "Finish". So, router reboots after every tuned page (GUI didn't show this, only big delay meter)!