On Wayland, GTK3/4 windows work well with fractional scaling (on GNOME). They are rendered at 200% and then downscaled by the compositor, which looks mostly fine.
Blurryness is often caused by GTK2/old Qt5/Electron applications that don't support Wayland and are rendered using XWayland at 100% and then upscaled by the compositor.
Blurryness is often caused by GTK2/old Qt5/Electron applications that don't support Wayland and are rendered using XWayland at 100% and then upscaled by the compositor.