Hey guys! I have installed Sierra 10.12.6 on my Gigabyte Z87 HD3, with Intel i5 4570 and a GeForce Gigabyte GTX 650 OC 2GB. The thing is.. the system works good, but after installing the nVidia web drivers, I have slow boot times.. it takes quite a lot to load at the Apple screen. Before installing the drivers, it was way faster. Thanks!