The computer resources available shouldn't create any difference in the ultimate quality of the output file, the only difference will be the time required to create it. From a process viewpoint it is easier to work with a faster computer because you spend less time waiting for the computer to do its processing after you make an image adjustment. I first started using DPP with a Canon 1D Mark II back in 2005 with a pretty slow Dell desktop and with that setup I found plenty of other things to do while the computer was crunching through a RAW image 🙂
It is also a great point that cropping with the associated "zooming" will result in a softer looking image as the sensor to screen pixel assignment hits a 1 to 1 ratio or beyond and this happens long before this point when higher ISO (or poor exposure) results in softening via noise. Under the right conditions, pretty severe crops can be used that will still provide a reasonably sharp photo at normal viewing or print sizes but trying to "blow them up" beyond that point results in softness.
As an example, the first crop below uses about 25% of the sensor area of my 1DX M2 and the second crop is 4% of the available sensor area so trying to do a large magnification or print of the tiny crop would result in a very soft photo and neither crop would be desirable for portrait work.
Rodger
