The metric HS Duration represents the total amount of time the GPU spent executing hull shader code.
- If HS Duration is 50,000 it means that the GPU spent 50 milliseconds executing hull shader code for the selected ergs.
- If HS Duration is 0, it means that either the time spent executing hull shader code was negligible, or there was no hull shader in use.
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If the HS Duration is larger than you expect, you can examine your hull shader code in the Shaders Tab in the Intel® GPA Frame Analyzer to investigate possible optimizations.