get the x most similar texts from a lot of texts to one text.
maybe change the page to text is better.
You should not compare the text to every text, because its too slow.
I don't know what you mean by similar, but perhaps you ought to load your texts into a search system like Lucene and pose your 'one text' to it as a query. Lucene does pre-index the texts so it can quickly find the most similar ones (by its lights) at query-time, as you asked.