Look for RenderMan preferences in Maya's Preferences window.
Render
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Threads
Rendering Threads
The number of threads to use for preview or IPR renders. A value of 0 indicates that all processors will be used. Negative values indicate all processors minus the specified number will be used. The default of -2 allows the user interface to remain responsive during continuous rendering.
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Viewport
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Real Time
Default Lights Shading
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