https://community.intel.com/t5/Graphics/Poor-DirectX-11-flip-blit-performance-with-Intel-HD-4K/m-p/497302#M50741 <P>Hi Greg</P><P></P><P>I have passed this information on to our DirectX developers and will update this thread when I have additional information.</P><P></P><P>Thanks</P><P>Robert</P> Wed, 22 Apr 2015 16:44:15 GMT ROBERT_U_Intel 2015-04-22T16:44:15Z https://community.intel.com/t5/Graphics/Poor-DirectX-11-flip-blit-performance-with-Intel-HD-4K/m-p/497301#M50740 <P>I am developing applications to run on Intel HD graphics.</P><P>I have a Nuc with HD 5000 and notebook with HD 5300.</P><P>At very high, approximately 4K resolutions, such as 3200x1800, I am seeing a significant performance decrease.</P><P></P><P>At lower resolutions such as 1920x1080, the difference between DX11 swap effects and OpenGL are insignificant. I am concerned that either I've misconfigured something, or the DirectX 11 run-time or drivers are performing unnecessary copies or work.</P><P></P><P>When configuring the swap chain using DirectX 11, I can select a swap effect of DXGI_SWAP_EFFECT_DISCARD or DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL. The DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL requires vsync and triple buffering but can maintain 60hz, while DXGI_SWAP_EFFECT_DISCARD will run at about 40hz for the same display content. Another way to gain some performance is to request full screen exclusive use via the sway chain description.</P><P></P><P>I currently don't have an exact comparison, but an older version of the application, running OpenGL, also maintains 60hz whether running in a window or fullscreen window.</P><P></P><P>My question is: Why the slow performance flipping or blitting at very high resolutions with DirectX 11, particularly compared to OpenGL? </P><P>OpenGL does not appear to suffer the same performance impact. Changing swapchain effect to DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL helps a lot, as does fullscreen exclusive, however I'd like flexible display configuration without compromising performance.</P> Wed, 22 Apr 2015 07:31:55 GMT https://community.intel.com/t5/Graphics/Poor-DirectX-11-flip-blit-performance-with-Intel-HD-4K/m-p/497301#M50740 idata 2015-04-22T07:31:55Z https://community.intel.com/t5/Graphics/Poor-DirectX-11-flip-blit-performance-with-Intel-HD-4K/m-p/497302#M50741 <P>Hi Greg</P><P></P><P>I have passed this information on to our DirectX developers and will update this thread when I have additional information.</P><P></P><P>Thanks</P><P>Robert</P> Wed, 22 Apr 2015 16:44:15 GMT https://community.intel.com/t5/Graphics/Poor-DirectX-11-flip-blit-performance-with-Intel-HD-4K/m-p/497302#M50741 ROBERT_U_Intel 2015-04-22T16:44:15Z https://community.intel.com/t5/Graphics/Poor-DirectX-11-flip-blit-performance-with-Intel-HD-4K/m-p/497303#M50742 <P>Thanks for passing this issue on to the developers Robert.</P><P>Since it's been a while... Is there any movement on this issue?</P> Mon, 29 Jun 2015 06:12:25 GMT https://community.intel.com/t5/Graphics/Poor-DirectX-11-flip-blit-performance-with-Intel-HD-4K/m-p/497303#M50742 idata 2015-06-29T06:12:25Z