In my case it was resolved when I switched my GPU from an AMD HD7970. Rolling back to an older AMD driver temporarily resolved the issue and switching to an NVidia GTX1080 permanently resolved it. I have not had an issue with the print dialogue since
I have the same problem printing. Takes forever. I have an 8 core processor, 64Gb of memory, when I had a Video Card issue and a graphic processor that was not supported in the recent update to Photoshop, I purchased a new nVidia Quadro P2200 equipped with photoshop supported graphic processor. When I attempt to print to my Canon Pro10 it takes forever for program to view/change printer settings and takes forever to start printing. When I use other applications such as Microsoft products, the programs can view/change settings and files/photos/graphics sent to the printer quickly print. I have seen other posts of this same print problem.