How to speed up JCO function call

Hello,
i have some function module in r/3 which returns a huge amount of data. When i am testing this fm in r/3 this function takes few seconds for executing. But when i run this function with jco from java it takes about ten times more :(.
Is there - eg in jco - some possibilities of speeding up connection - or another technologies i can use? (i would like to try make xml in abap and pack it..is it good idea or the result will be only my waste time?)
thanks for each answer...
JJ

Hi,
I can't see how you can significantly increase the jco speed, but you can using caching if possible(particularly at the java side) and your other suggestion make sense. I expect you don't present all that data you are fetching, so perhaps you should move the heaviest business logic to the ABAP side and only transfer the results ?
Dagfinn

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I would surely check with the ABAPer's on your observation. However there is one more observation that is worrying me.
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procedure execute_it( p_name VARCHAR2 ) ;
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function one return number is
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public class JcoTest {
private static JCO.Client theConnection;
private static IRepository theRepository;
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createConnection();
retrieveRepository();
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try {
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catch (Exception ex)
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