Impress - Slide Show lagging with projector


I have a problem with LibreOffice Impress when displaying slide show with projector. Slides are displaying OK on laptops monitor, but
projector picture is lagging. When I change to next slide on laptop, it changes OK, but the slide on projector picture is leaving behind. It is always
couple of mouse clicks behind from laptops slide. What is causing this?

Laptop is quite old Lenovo W520 with Ubuntu 14.04.
Projector is Epson EB-1771W