4.19 & 4.20 Editor & Packaged Games Have Hangs/Hiccups Constantly

General Feedback & Requests
46

I have tested nVidia drivers and:
385.69 (September 21, 2017) is the last driver that doesn’t show these problems (hiccups with Material Billboard).
387.92 (October 9, 2017) is the first one where I get hiccups.