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In high performance web applications you will always have bottlenecks within your application. Identifying these bottlenecks and optimizing is a tedious task and typically show themselves underload. A single bad/unindexed query can bring a server to its knees. A large number of rows will also help to highlight any poor queries, and on very large datasets you may come to the point where you may have to make decisions whether to denormilize database schema.