Through rendering at a larger resolution internally and then scaling the rendered image back down, macOS supports fractional scaling to some degree. It taxes th

Through rendering at a larger resolution internally and then scaling the rendered image back down, macOS supports fractional scaling to some degree. It taxes the GPU more than 2x does and isn’t as flexible as a slider, but it also cleanly avoids issues that’d normally come with fractional scaling. So for example a MacBook Pro with a native resolution of 2880x1800 and native effective 2x of 1440x900 can also run at effective 1680x1050 or effective 1920x1200. This works on external displays as well.