In regards to this issue I want to add my 0.002 cents. I never had a lag problem with Photoshop. I understand that even though people have "high end" computers, it doesn't mean they take care of what is going on with their systems. People install, upgrade, re-install all the time and while doing so something is bound to go wrong. A good example a lot of people were and still reporting problems when upgrading to Win 10 from previous versions of windows. The keyword is "upgrading". It is a good custom to have a clean install of your OS and all your "important" programs once 2-3 years or so. It may be longer, depends on what you do. Example: A person has Nvidia card, let it be TOP END, SUPER-PUPER card and then there is a driver update pops up, where you can just download and install it. So, a person does it, installs new driver on top of the old one, but something goes wrong, 1 file not deleted, or some compatibility issues and the whole system goes to crap, it becomes slow , crashing, etc, etc. I strongly suggest to have clean, stable, well taken care of system before blaming Adobe or CC for being bad.
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