VERY slow reporting performance

We've created reports which, when run directly on Oracle through sqlplus (copying the exact SQL from the report) take around 3 minutes, when run from BO (using Web Intelligence) take hours.
The SQL outputs around 300,000 rows, which equates to a few hundred pages in the report.  Is there a reason why the report would take so long (the session to Oracle is open the whole time)?  I can understand it not taking just the time for Oracle to execute the query, as WebI then needs to take the results and produce the report, but I wouldn't expect it to take hours.
So far on our servers we've concentrated on making Oracle perform faster, and now we've got that working better our attention has been drawn to the performance issues of the reporting, and we don't have any experience with tuning it, so any advice would be very much appreciated.
We're running BO Enterprise XI R2 SP3 on Linux with Web Intelligence as the only reporting interface.  The database is Oracle RAC (3 node cluster) 10.2.0.4.

Correction: I incorrectly said jobserver in the earlier post (I read your post wrong).
You need to start a trace on the CMS (for querytiming), the Webi Report Server and the Connection Server (which accesses the db)
For the CMS trace, stop the CMS, in ccm.config, add a '-trace -querytiming' to the end of the cmsLaunch line. Similarly, add a -trace to the command line for the Webi Report Server (I don't remember the exact line; I don't have a XI R2 deployment on Linux available right now)
To enable tracing on the connection server, do the following:
(SAP 1197745 - How to enable connection server tracing on a UNIX platform)
Open cs.cfg in a text editor. These are located by default in
Linux: bobje/enterprise115/linux_x86/dataAccess/RDBMS/connectionServer/cs.cfg
Locate the following entry:
Traces ClassID="csTRACELOG" Active="No"
Change the "No" to "Yes".
Traces ClassID="csTRACELOG" Active="Yes"
Save the file.
Restart the Web Intelligence Report Server.
====================
NOTE:
Be aware that connection server traces slow down the server performance. Detailed traces get generated when this level of tracing is enabled. Disable tracing when not needed.
====================
PS: The Webi Report Server contains the Connection Server libraries. The Connection Server runs in-proc within the Webi Report Server. Hence the need to restart the Webi Report Server.
Also, I encourage you to open a ticket with BO on this. Performance issues are never easy to troubleshoot, even less so on a forum such as this.
Finally, I don't believe there is any document that lists all command line options. Or rather, if such a document exists, I don't believe it's available for public consumption.

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      db file sequential read                       812        0.00          0.02
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          1     NESTED LOOPS
          1      NESTED LOOPS
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          1      TABLE ACCESS   MODE: ANALYZED (BY INDEX ROWID) OF
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    The optimizer must be peeking at my bind variables with it's eyes closed. I'm the only one testing and I've never passed %anything as a bind value. :)
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    Message was edited by:
    S. Khawar

    Dear Hamdy,
    Hope You are fine.
    I have some strange problems running Oracle 10gR2 Forms and Reports Services(WIthout a Patch) on Windows 2000(P4.1.5GRam) with Oracle Database 10gR2 on RHEL 4.0(P3Xeon,2GRam).
    Users are using WindowsXp 2002 or Higher.
    Other Info about Setup
    1). One more OC4J Instance was created but could not solve problem.
    2). Report Servers min 3 Max 10.
    There is a frequently accessed Form related to Voucher Entery and its Report.
    1). Sometimes records more than 20 detail enteries could not be saved and after refreshing the webbrowser(Internet Explorer 6 or higher) the user is able to insert a large voucher. This is very trouble for the data entery operators.
    2). Other is that, Sometimes user is working on application but control losses from user(ability to work with application) where as there can work on applications and window services. This is also very problem for a user when he has entered 10 detail records against a voucher.
    3). The Application is also being accessed from other cities by using public IP.
    These Problems are very strange for me.
    Waiting for user response.....

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