Query in PL/SQL code is slower

I have a very strange issue within my development database, I'm using Oracle 10g.
I created a query to read some data from a large collection of tables -OFDM tables- I have tested and tuned the performance of the query from (PL/SQL Developer 7 ), it takes only 2 minutes to finish but when I use the same query as a cursor in a database procedure it consume a lot of time around 15 min to get the data.
Your help is appreciated

[url http://groups.google.de/group/comp.databases.oracle.server/browse_frm/thread/df893cf9be9b2451/54f9cf0e937d7158?hl=de&tvc=1&q=%22Beautified%22+code+runs+slower#54f9cf0e937d7158]Recently somebody complained about slow performance after code was beatified in PL SQL Developer, after recompilation without flag "Add Debug Information" it run faster...
(just a guess)
Best regards
Maxim

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