title: What is "small" collection or "huge" collection
body: <p>another day, another problem :) 
  Since I woke up today I'm wondering about numbers. My experience does not allow me to answear my questions: 
  What is the small collection? what is the medium size collection? what is the huge collection?
  I mean where're the lines? ex. between 0 to XX elements is small collection and so on... I read many articles, blog posts about using collections and almost everywhere we can read "this solution is good for small collections" etc. and I ask: What does that mean? I know there's no hard lines but I think we can name it more or less :) </p>