If you have a GTX 1050, RX 560, or Intel Iris Xe , the new DirectX 11 plugin is your best choice. If you have an RTX 3060+, switch to Vulkan for lower CPU usage.
If you are getting an error saying a "d3dx11_43.dll" or similar is missing, you don't need a plugin—you need the DirectX End-User Runtime from Microsoft to update your Windows libraries. To help you get the best performance, let me know: What is your GPU/Graphics Card ? Are you trying to fix a specific error message ? Are you using the old 1.6.0 version or the new 2.0 version ? pcsx2 directx 11 plugin download new
Your CPU or GPU is bottlenecking. Fix: