If DirectX 12 support will address or significantly improve the current performance issues, please consider bringing the release forward for current users.
It won’t significantly improve the experience on PC. Asoso have said so.
The DX12 will enable more enhancements to graphics (possibly things like contrails, tire puffs etc.) but not core improvements to FPS. Personally speaking, I’ve found that the entry “Dreadful Performance” on the tracker list published monthly is indeed improving. The core sim is running quite nicely for my tier hardware (low end), I was running 57fps on Low, and opted to sacrifice a little frame rate for immersion like AI Offline Traffic. This core sim will improve over time, it’s just not going to be a Magic Bullet solution like DX12.