What does it mean if a guy you just started texting replies fast (within a few minutes)?

I recently started chatting with this guy on Facebook, and I messaged him once, giving him like a manual on something that could help him with his studying and he said thank you with a lot of u's. Anyways, I initiated the second chat and messaged him again a few days later, and at first I messaged him at 2:43 pm then he messaged back at 2:45 pm. I was doing something so when I replied back to him, it was already 3:52 pm, and he replied back at 3:54 pm. I messaged him lastly at 5:34 pm (again since I was busy), but he responded 5:35 pm. Maybe that's just going over my head, but does it mean anything in your opinion?
What does it mean if a guy you just started texting replies fast (within a few minutes)?
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