Since yesterday I have had this problem with Photoshop, where it lags when I zoom, dezoom and move around the image, leaving some marks. Everything else works, and I still can work with it but it is annoying. I have attached an image!
I tried restarting my computer twice, and updating Photoshop.
Thanks for your help,
Check out your system info and update your product or operating system.
Go to your Photoshop Preferences/Performance and check your Graphic Processor settings. Make sure it detects a graphics card.
You can also click "Advanced Settings" and make sure everything is checked.
If it is an you are still lagging, try unchecking "Use Open GL" and see if that improves.
I think it worked with everything checked, I had to reboot my computer afterwards for it to have an effect.
Thanks for your help!