Rendering with the Batch renderer also produce a faster rendering, since Maya isnt taking up memory.

Another way is to optimize your scene .. this is always a good starting point .. By optimizing I meen something like making sure your Dmap (for shadows on the lights) and texture file resolutions is not larger than absolutely required, using raytracing only when needed, turning off Double sided, where possible, and such things..

and finaly utilizing Light linking and rendering in passes is also a possible way to increase rendering times.