Settings Tab > Performance:
-Text Size: This slider allows you to modify the global size of the text font used by GoS for LOL.
-Text Shadow: This slider allows you to apply single shadow (1) or full shadow (2) on the global font. (Disable it for better performance on slower computers)
-Circles Quality: This slider allows you to modify the global DirectX circles quality, higher values (255) make the circles look worse, but perform best on slower computers.
-HpBarDamageBorder: if enabled, it will draw a black border around the damage slider next to the enemy health. (disable it for better performance)