As far as I know a lot of people have issue with light. Had it by myself from version 7, but it getting only worse. Also sure it's somehow connected with reflections, so if it's possible to turn it off completely would love to hear how.
Yeah, I also noticed when I jump into the "pool" in the office, the splashed up water, each drop looking like they have their own reflection, absolutely destroys my framerate for roughly 2 seconds
