Intel HD Graphics DirectX Developer's Guide (Sandy Bridge)

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Intel® HD Graphics DirectX* Developer's Guide The figure below shows a significant spike in GPU processing (aggregate duration of time) over the sampling set. This indicated a large number of calls to Clear a buffer in the histogram. Figure 11 Intel® GPA Frame Analyzer Sampling Indicating a Hot Spot in the Clear Call Recall in section “Tips on Texture Sampling / Pixel Operations” that unnecessary calls to Clear have a performance impact on Intel processor graphics. Noting that we have selected a low fidelity mode, the code was double checked and determined that while Shadows were disabled in low fidelity mode, the sizeable texture buffer was still getting allocated and Cleared. A simple condition to avoid this call when Shadows were disabled yielded a slight performance boost to 15 frames-per-second as noted below without changing the rendered scene. 58 Document Number: 321371-002US
Appendix: Enhancing Graphics Performance on Intel® Processor Graphics with Intel® GPA Figure 12 After Disabling the Clear Call when Shadows are Disabled Now that one problem was diagnosed, returning to the Intel® GPA System Analyzer yielded numbers similar to the previous result. This is somewhat expected because the first fix was not the root cause, but still worth evaluating as a possible change. How to maximize graphics performance on Intel® Integrated Graphics 59
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Intel HD Graphics DirectX Developer's Guide (Sandy Bridge)

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