I think those massive performance issues were only restricted to games using DX9 because the architecture had no support for it in HW so what they did was use the translation layer DX9 to Vulkan for those titles and performance went up. Shouldn't be an issue anymore.
Nobody has good support for DX9 in their hardware, it's all in the drivers. And that's why the delta between Nvidia and everybody else is so much higher for DX9-DX11 than it is for DX12, Metal & Vulcan.
The latest driver claims to improve DX9 performance by 60%. Counter-Strike by 120%.
Myself I don't care about old games. As long as they're "good enough", I worry about unreleased games that will force me to get a new video card before I would otherwise.
