Ultra isn't a good preset, it adds a lot of advanced quality boost that isn't needed, and doesn't have good AA setttings either.
If you use an advanced lighting model (AO, GI), in the light tab of the atmo editor, move the quality slider to -0.5, you won't notice loss off quality, but will redner faster.
I also suggest not using GI, since it does the same as AO, but on a global scale that isn't necessary, and adds a lot of render time.
If you use GR, keep quality at zero, and don't use more than 20% shadow smoothing, unless it's an interior render.
Depending on your atmo (spectral with or without clouds, non spectral), you may need to boost the sampling quality of your clouds. Make test renders first. If no spectral clouds, lower the sky quality to -1
Now the render options:
Advanced quality effects boost: keep this around 40%, never above 46.
Reflections: use 6 subrays, unless you are only using water, in this case 5 is enough. Keep recursive rays low, 3 is enough ( this setting controls how many times a reflective surface is reflected on another reflective surface, like a mirror in front of another mirror)
Anti aliasing: I would go for the "crisp" method, which is the best to eliminate aliasing and noise, with min8/max20, quality 70%, with default subpixel sampling (if an interior render with GR, go for systematic)
Adding 10% texture flitering will smooth out the textures, which might be good if you use texture based bump, but will slow down a bit the render. Don't use texture anti aliasing.
Hope this helps.