I am not certain why fractional scaling below 100% would cause any different performance issues than fractional scaling above 100%, but it is certainly something that I have wanted for a long time.... sometimes the fact that it would cause some blurring as the image would be scaled to contain more pixels than the display... is not a problem.
Please do consider allowing this if it is possible, even if it is not directly exposed to the user on most distros, accessing it through gnome-tweaks or dconf would be fine.
I am not certain why fractional scaling below 100% would cause any different performance issues than fractional scaling above 100%, but it is certainly something that I have wanted for a long time.... sometimes the fact that it would cause some blurring as the image would be scaled to contain more pixels than the display... is not a problem.
Please do consider allowing this if it is possible, even if it is not directly exposed to the user on most distros, accessing it through gnome-tweaks or dconf would be fine.