Are you on the latest update of your graphic Card?
in Edit - > Preferences -> Performance
uncheck : Use graphic Processor
Restart Photoshop, and re-try the Brush Tool.
If that solved the Problem , Check for Update for the Graphic Card
then Re-check Use Graphic Processor
I followed your steps and unchecked ''Use graphic processor'', and after restarting Photoshop the brush tool worked fine with no lag. But after rechecking the graphic processor (after updating the graphics card) things began to slow down again. Should I just keep it turned off? Or will it slow down other things in the future?
Sir, i have nvidia graphic processor but still its lagging.what should i do?
Many Features in Photoshop Require "Use graphic Processor " turned On.
After updating the Graphic Card, Try to reset the Preferences to Their Default, follow the steps in this Video
Reset Preferences in Photoshop
and let us know if that Helps
After having updated my graphics card I did exactly what was in the tutorial, (first method) by just removing the preferences file and enabled my graphics processor again. It works perfectly fine now, thanks!