Oracle Client vs ODP.NET is ASP.NET Application

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Hi all,

We've developped an asp.net application using Oracle Client for database connection,

Our application is running on WS 2003 server

Now we want to move to WS2008 server and change the driver to ODP.NET,

I have notice , on using some loadtest, that with ODP.NET, the applcation consumme more memory than with Oracle Client,

for a test with 230 users and oracle client the average memory used is 793 Mo

with ODP.NET, for the same loadtest configuration, the average memory used is 871 Mo

My question is why with ODP.NET we consumme more memory than with Oracle Client?

I have made some search in the net , and it seems that ODP.NET put schema information on chache, can you confirm that?

Oracle version : 11.2.0

thank's in advance