i burned mine on cheap jvc dvd-r and its not laggy, i take it your on a pal system what firmware are you running and what method did you use to block the update(if you did block the update), i would say since your verbatims are giving you issues at 4x try 6x burn speed , its either a burn speed issue or an issue with your pal firmware thats causing lagging i would say. Dunno if the deflickering option will help but its in game options but hell you can try that also. Im betting its a burn speed issue though thats causing you lagg.