This issue has been happening for me for the last week or so at least, making photoshop completely useless for me unfortunately. My mouse lags really badly when rolling over the canvas area in Photoshop (it works smoothly when rolling over the palettes and toolbars/menu of the Photoshop window). And it works fine in all other programs. I'm assuming it's a memory/processor thing?
I typically have photoshop, illustrator, sketch, adobe acrobat, Chrome, Slack and Numbers open at the same time.
I would first try closing all other programs and try PS. 16gb sounds like a lot of ram but todays programs gobble up memory like candy. I'm running 32g and if I have more than three programs running I start noticing some lag. Besides, the latest version of PS has a memory leak.
in simple terms, a memory leak is when a program is done using a block of memory it doesn't release it so it or other programs can use it.
Just remembered. There is a purge command under edit which does release some memory if you're in a pinch and don't want to reboot. It does need to be fixed though!!!!!!
ok thanks! I just purged the video cache.