Xsettingsd is a lightweight xsettings daemon which provides settings to Xorg applications via the XSETTINGS specification when not running one (like when using KDE). Some applications like Java or Wine do not get the font settings through Fontconfig so this is necessary to provide settings like anti-aliasing and font hinting.
Install xsettingsd or xsettingsd-gitAUR.
See https://github.com/derat/xsettingsd/wiki/Settings for detailed syntax.
An example configuration to provide better font rendering:
Xft/Hinting 1 Xft/HintStyle "hintslight" Xft/Antialias 1 Xft/RGBA "rgb"
The package provides
xsettingsd.service which you can Start.
Alternatively, configure setting in #Configuration and append
xsettingsd & to
~/.xinitrc if you are using xinit or
~/.xprofile if you are using a Display manager (see Autostarting for more details).