Sprites lag

[Greychan]

Ever since I started playing ESF on my new laptop I've had this lag caused by the sprites shining on other surfaces. In other words, when I transform in midair or shoot a beam away from any thing else in the map, everything's fine. However, if I transform near the ground, or shoot a beam near the ground, or when the beam hits the side of the map, I get severe lag. What's a good fix?