If you look at the rest of the nodes that I have written you will discover that I am a big Date::Manip fan.
That been said, I think that "slow" is a relative term. Yes it is big, but when ever I have implimented it into my scripts, I have found very little, if any, time lag. If you are trying to scrape every last clock cycle out of a huge script, you probably don't want to use it. But if a milli-second or so doesn't matter to you, the flexibility of Date::Manip makes it more than worth it. I can honestly say that I haven't used any of the other Date conversion modules, mainly because Date::Manip has everything that I need. I guess once you get to know a module, you kind of get stuck on it. Mind you that I am not knocking any of the other modules, I just think that for what you get out of it, Date::Manip is where it's at.