Interesting thing, problem still exists on system with Nvidia, but now demo runs on Celeron N3350 (I always tested on both systems, hoping it would work on Celeron). Works not bad, FPS drops in animated scenes, but still playable.
I tried settings in Nvidia panel, but sadly it didn't help. Maybe problem is really in drivers, but I haven't been able to find newer ones yet. Anyway, at least I have a system on which I can test next builds, so I think I'll join your Patreon to try public version. I will continue to try builds on both systems, maybe problem will solve itself