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I have statistic website, witch before showing data makes calculations with data from mysql db, php functions makes a lot of mysql queries.
Example pages http://www.nora.lt/2012/league.php?id=487 http://www.nora.lt/2012/team.php?tid=469 http://www.nora.lt/2012/event.php?id=4334487
All those three types of pages: league, team, event has to be optimized for performance and security.
Main thing - page should load fast, and then load data, inner tables load separately with ajax/jquery.
For interested freelancers ill show source code.