Photoshop jumps around screen of iMac

Participant ,
Jan 23, 2019 Jan 23, 2019

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What I was doing:

I do screen grabs of woodworking projects I wish to make and save them to Lightroom CC.  I selected one of these screen shots while viewing in LR CC and selected to edit in Photoshop.  The pic opened there.  I wanted to remove the background and place it on a graph paper background so I could better estimate dimensions.  I used the quick select brush to select areas that I deleted.  I enlarged photo and tried to erase more of the background.  My eraser did not work and as I moved the picture around the screen using my mouse, i found that the picture was moving in a very jumpy fashion and often, it would move on its own or continue to move after I stopped using the mouse.  My iMac processor is 3GHz Intel Core i5, with 16 GB memory and a Radeon Pro 555 @ 2048 MB.  Is my iMac just too underpowered for PS?

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