The other thing that would probably be useful is that at the moment there is a glitch with Photoshop’s temporary files and instead of being saved on a scratch drive they are being stored on the C: drive under C:/Users/ [name]/App.Data/Local/ temp files. These can take up several gigabytes of space and may well compromise the speed and efficiency of your C: drive. They can be safely removed but it has to be done by you - Photoshops own system has not organised the deletion of them due to an oversight by the software folk.
