I tested today with no dual screen and I got 62 fps at 720 p my hardware\driver seem to have problems with fullscreenapp when dual screen is on(empty second screen) dual screen still produce 33 ms draw.I have to check with other games.
Draw is always switching from 3 to 12 average and up to 17 but in a single almost empty view, but fps are constant apart from that view and this time with lpv too.Sorry if it is my hardware fault it remains to find out if it have this issue just with UE or with a specific driver.