Default disable hw overlays

Hi there as we know android 4.3 bring us hw bugg with screen trickles in landscape mode so to fix bug we need check in developers ontions đisable hw overlays its not a probliem but i wanna ask did its affect battery life ? Becouse when you check it gpu allways works to create screen as i understand so im interesting with battery life .
Xperia X8 / Xperia Ray / Xperia SP / Xperia Z / Xperia V