..but fortunately, you can switch to Direct3D 11!

Right-click your game in your library and enter the following into the launch options line:

+r_rhirenderfamily "d3d11"

With the quotes! It should look like this:


(Note: -skipmovies is absolutely optional, but you should totally do it because it skips the annoying splash screens)

Now start the game back up and enjoy perfect gameplay like you were used to in OG Quake!

..or you simply wanted to test, do the following:

Delete the line out of the launch options and launch the game. Once you can access the console using the tidle key, enter

r_rhirenderfamily vulkan

And afterwards restart.

(Don't actually restart your computer, just enter the word "restart" into console.)

You can also enter the line in the launch options if you want.

Once you can access the console using the tidle key (~), enter the following:

r_gpuCulling 0

This might fix the issue for you. If it doesn't set the value back to 1.

You can also add this to your launch options if you want, then you'd have to add it like this:

+r_gpuCulling "0"

All credit goes to Reverend Dak for commenting this!