Increase overall rendering speed in mental ray for Maya

To make a scene render faster, do any of the following:

Use average BSP (mental ray for Maya) settings

When mental ray for Maya raytraces, it calculates the effects using an average of the depth and the average of the leaf size settings of the BSP.

To speed up subsequent renderings, you can render instead with the average settings (instead of your initial settings).

Find the averages in Maya's Output Window after you render the scene the first time (with Verbosity Level set to Progress Messages or above in Render > Render Current Frame > and Render > Batch Render > ), then change the settings in the Memory and Performance section.

Example averages found in the Output Window