Speed vs Quality in Vray
Max Rendering Techniques
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If there is one thing that can truly control the balance of speed
versus quality in Vray it is image sampling. Image sampling is
basically part of anti-aliasing. This tab can take your
renderings from 20 second quick tests to 30 minute high quality
renders without having to adjust any other aspect of the rendering.
They control anything from fine detailed textures, to glossy
reflections and refraction, to aspects like depth-of-field and
motion blur, all at once. This tutorial helps to make sense of
each one and simplify the process, so that the user can easily
control the quality of the rendering in the most efficient way.
Sample scene requirements: Max 8 or higher, Vray 1.5rc3 or higher.
All textures provided except HDR. Users must provide their
own HDRI for testing.

part 1:

part 2: