We recently experienced a very odd ripple on our Mac Mini External Displays (both Dell Models) when you dragged windows across the screen(s) and wanted to share with you possible solutions.
- First off check for possible causes of interference. Is there a power drain on your Mac, with say USB ports, or is something incorrectly set up?
- If you have ruled out the above then you may need to enable 'subpixel font rendering on non-Apple Displays' and to do this simply open Terminal and type/copy paste the following command:-
Now reboot your Mac and hopefully the issue is now resolved.