xfce - How do I finetune subpixel font anti-aliasing?
If your XFCE renders text with overly hard, thin lines instead of smooth anti-aliased lines, you might need to disable the LCD Filter as discribed in the linked article.
If your XFCE renders text with overly hard, thin lines instead of smooth anti-aliased lines, you might need to disable the LCD Filter as discribed in the linked article.