I am writing a D3D11 program which needs to display a large resolution scene across several screens. I used DXGI_SWAP_EFFECT_DISCARD to create swapchain. It works for most of the time. But sometimes one or more screens may display images with one more frame latency than others thus made the image teared into parts. I am sure that I present contents to each screen with careful synchronization. I think the reason is that back buffer of each swapchain is different and out of control. How should I control the latency of each swapchain?