
Most notable with DXVK 2.6 is introducing NVIDIA Reflex support in conjunction with Proton Experimental and Vulkan drivers supporting the VK_NV_low_latency2 extension. Reflex can be enabled within D3D11 games using this feature like for God of War 2, Overwatch 2, and Quake Champions.
DXVK 2.6 also brings numerous D3D10 / D3D11 fixes and improvements such as for Assassin's Creed 3, various GPU-bound performance enhancements, various other performance optimizations, and more. There are also a handful of fixes for older Direct3D 8 and Direct3D 9 titles.

DXVK 2.6 also reworks its Vulkan swapchain implementation to be more robust and a number of other enhancements.
More details on the DXVK 2.6 release via GitHub .