There are two settings related to Xfce font rendering that make fonts look better: Anti-aliasing and LCD Hinting.
From my experience with Xubuntu these two settings are set to its optimal value, so I never had any complains about the font appearance. But if you think your fonts could look better, proceed as described below.
Check current settings
Open a terminal window and run:
If your Xft.antialias is set to "0" or Xft.lcdfilter is not "ldcdefault", run:
# Enable anti-aliasing xfconf-query -c xsettings -p /Xft/Antialias -n -t int -s 1 # Set LCDHinting to lcddefault xfconf-query -c xsettings -p /Xft/Lcdfilter -n -t string -s lcddefault
You should logout and in for settings take full effect.
Note:Other possible values for Lcdfilter are lcdnone, lcddefault, lcdlight and lcdlegacy.