Since the update to 2017 CC Photoshop, it is taking far too long to save a moderately sized file. Up to 2 minutes for a 90MB file. I am running a 4 GHz iMac with an SSD Hybrid HD, 32GB of RAM and an AMD Radeon R9 M295X graphics card (4GB). The machine is plenty fast enough. Looking at the activity monitor reveals 30% core use, so not very conclusive. I discarded the settings file on photoshop startup, and was able to save one file at the correct speed, that is to say, about 2 seconds, then it reverted to the slow behaviour. Further discarding of the settings file did not change this behaviour.