Because Adobe need to please as many people as possible Photoshop doesn’t come setup with the best defaults for working on large photographic images.
After many years of working with Photoshop I have honed down a series of settings that make using Photoshop quicker and more accurate.
Normally I do this work on client machines and leave them with a archival copy to ensure they can reset their system if they need to such as when reinstalling Photoshop etc.
I have now produced a generic version of this action for free download to help the community. It is available from the Downloads section
Naturally my paying clients actions are better tied into their machines/workflow but I do hope this action will make a good starting point for you.