problems with safari

Hi, I have my whole item with hackintosh problems in safari.

Previously didn't play films on netflix, but a bigsur update helped (apparently there was some issue in the firmware).

But now in google maps i have artifacts. But turning on WebGL via Metal helps.

Also, some sites with long script response don't work, for example sending a form on some loaded site. safari just gives an error that the page failed to load.

Although at the same time in Chrome everything works fine

Smbios: iMac (Retina 5K, 27-inch, Late 2015)

Big sur

i3 6100

rx 570