I think it is only marginally faster .. Like cut off an hour or so on a six hour render ... Have oly used it a couple of times. My advise is think about ways to reduce the thing. For example if you ave a ton of grass that is further back in the scene you might make that a texture and then have a medium grade grass in the front and a really nice grass right in the front ... Anyway ...Not sure what else to do but render in sections. Had to do that before. Would render a simplifed scene with part of the objects saved to another file. Then add bits and render that section, add different bits and render that section and then different bits and render that. Only way it wouldn't take a few days. Combine in photoshop ... hope that helps but not sure if it will. Some scenes can't be done that way ... Later and good luck