I wish writers would stop with the whole "thinking faster than the speed of light". Thought is in hertz, as in clock rate (operations per second). The speed of light is distanced traveled. The two are radically different. What you could do is talk about how fast your neurons are going, but then that's going to change up your body chemistry due to the fact it's dictated by things like thickness, insulation and length traveled.
In other words, writers shouldn't make up bullshit science when it's common enough knowledge. It just makes you look bad.