How to bring wall time closer to cpu time


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Just Got Here
I'm a novice user of NWChem and noticed significant difference between the cpu and wall time of my calculations (e.g., the factor of 2-2.5 for TD DFT calculations with frozen core electrons) even after using scratch directory (which helped a lot). Are there any general tips for settings in NWChem input file to bring the wall time closer to the cpu time?
Thanks!