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Remember the server is flying through over a million posts of text looking for a few select words and the server can only be so fast, so it's not too bad.
That pretty much sums it up, the search is looking through a huge database of information for very specific terms. There is also the fact that Invision board organises that information in a certain way, and the efficiency of the searches is down to the way in which Invision Board performs them.
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Google searches through billions (or maybe trillions) of sites in under a second, so I don't think its too much too ask.
Unlike Google, we don't have several warehouses full of servers situated all over the world to process our database searches for us.