Mild obsession is fantastic because it means I'm learning something new. Curiosity inspired me to dive headlong into research. In these cases, I'm driven by the pure need to simply know more about something I find inspiring, interesting, or fascinating. No one is going to grade my work, tell me to move faster or slower, look into another topic, or stop altogether. Mild obsession is driving me because I am curious and intrigued.
When I get to latch on to a new obsession, I go at it full-speed. I cycle through research and consumption until my need to explore and learn has been satisfied... and then I move onto the next obsession.