I saw that now the flicker is smoother and not so noticeable. In any case, it no longer hurts the eyes.
Thanks)
I think the problem is with modern hardware. Because I tried on win10 with the latest drivers and forced DirectX on and on win7 I tried to install older drivers or maybe not
Perhaps if you need here are my components:
https://drive.google.com/file/d/1uiDJKYRUYqtc9SI2O6uBk7NgOnZKRlYO/view?usp=shari...