[Evernoob]

I agree with this but also found that there can be a significant difference depending on your subject matter. It's typically easier for people in CS to publish because there are fewer barriers to developing and testing your work. Compare this to something like biology where a PhD student may have to cultivate an experiment involving animal tissues that may or may not become compromised somehow (for example), or some other delay that's much less likely to happen when working with computers, and you can see why they might take longer to develop something publishable.

Consequently there is an expectation that CS PhD students should publish more.