No, not Proton, but the dxvk stuff works on Windows too. You just need to replace some .dll files

Well there is d9vk and dxvk which translates directX 9, 10 and 11 to Vulkan and vkd3d which translates direct3D (directX 12) to Vulkan. So it’s all Vulkan on the Linux side, Proton ‘just’ uses one of these to translate the game into Vulkan or passes it through if the game is already Vulkan.

I don’t think there is a native (to GTA IV) Vulkan renderer in game though and therefore there isn’t anything more you can or have to do on Linux.

On Windows, some older games actually get performance improvements from the translation to Vulkan.

I chose to leave a year ago as the 3rd party apps (I was using RiF (Reddit is Fun)) were being killed. Realized it was the beginning of the end and I left.

Tried a couple of Lemmy apps since then (and I have been mostly lurking) and landed on Connect for Lemmy and I’m very happy to have left the corporate hell-hole of social media