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How do you know if you have been crawled? Look at your logfiles, you will see a spider identifying as coming from Fast.
The hickups comes from dealing with so much data I suppose. We're talking over 2 billion documents here that has to be sorted.
However Fast has been somewhat unstable lately and a lot of speculation have been going on.
We recently saw a large(r) Fast update [webmasterworld.com], and as heini says, the update frequency is very different from Google etc.