In the last day or so fonts suddenly look really bad on both my displays in Windows 10. I did recently make some changes in Control Panel - System - Advanced System Settings - Performance Settings. I had set it to 'Adjust for Best Performance' and only enabled 'Save Taskbar Thumbnail Previews,' 'Show Thumbnails Instead of Icons,' 'Smooth Edges of Screen Fonts,' 'Smooth-Scroll List Boxes,'
Here is a screenshot: https://ibb.co/2FxXzmK
Here is a screenshot: https://ibb.co/2FxXzmK