After upgrading to macOS Mojave the font rendering in Sublime Text 3 is not working correctly.
Just reporting the answer stated here by MTuner
Apple removed colored sub-pixel antialiasing in MacOS Mojave (https://developer.apple.com/videos/play/wwdc2018/209/ starting from ~28min)
To make fonts look normal in Sublime Text, add to Preferences:
// For the editor
"font_options": [ "gray_antialias" ],
// For the sidebar / other elements
"theme_font_options": [ "gray_antialias" ],