Sometimes reducing the bucket size to 16 or 8 helps. Reducing the number of raytrace bounces can also help. If you only use raytracing for shadows, you can reduce the number of bounces to 0. If you use reflections, it should be at least 1, if you're also using refractions, 2 is minimum. You can reduce the maximum texture size from 4096 to 3072 at the resolution you're using. THe maximum texture size should be at least as large as the largest dimension of your render, preferably somewhat larger (at 125% it's OK, increasing the max texture size beyond that only increases render times and lockup chances, but not image quality). Hope this helps.

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