The TCS Invocations metric represents the number of Tesselation Control Shader invocations. The Tesselation Control Shader is invoked once per patch.

Improving Performance

The Tesselation Control Shader is not usually a performance bottleneck, but it can definitely cause performance issues further down the rendering pipeline. If the Tesselation Control Shader specifies large tessellation factors, or as the TCS Invocations value increases, it results in more work for the fixed function tessellator as well as an increased number of TES Invocations and GS Invocations.

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