It will take as many samples per pixel as required to achieve the specified noise threshold. These settings work because the high AA subdivs essentially cause all the sampling to be performed by the image sampler. With tweaking, you may get faster results. Of course, there is a disadvantage: the scene may render quite slow. The beauty of these settings, though, is that they require almost no tweaking, and you are guaranteed to get a good result in the end. Please note that these settings are not optimal, in the sense that with enough tweaking, you can probably get similar quality with faster render times. The "universal" settings comprise a set of settings that we have found to work very well for still images in many situations.
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