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Doing a search is the equivalent of reading a book through word by word, looking for a specific word or passage. It gets you what you want, but nobody else can use the book during that time, and reading through it again will double that downtime. The server can read through the database in a fraction of a second, but for that time, it's taking as much of the available memory and processing power as vbulletin will alow it to.
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