Webi query performance in SAP BO 4.0 sp6

Hello,
I'm facing an issue with the webi reports in our BI 4 SP6 environment. The webi reports data fetch time is ridiculously slow, where as when these queries are run on Oracle 10g the results are returned much faster as compared to WebI. The same reports used to fetch data faster few months ago when we were on SP4.
Now my question is what can I do to improve the query data fetch time in webi? Is there some parameter that I can tweak in BO or do I need to add more services? Please suggest. thanks
Following are the specs of the QA environment:
We are using a clustered environment with 2 nodes (CUSNWA3T and CUSNWA3U) - these are the names of the nodes. Each node has 12 GB of RAM and each node is a VMware virtual machine running on windows server 2008. Each of these BO servers/nodes is having its own CMS server, I have broken down the APS into sub servers after facing issues with the DSL Bridge service.
Regards,
samique

Andreas,
thats for reply. Yep I agree with your suggestion about the RAM is there any document that details out how much RAM and processing power is required by SAP BO 4.x?
I had to turn down the explorer, crystal reports, AJS, Dashboard Services just to provide for the APS. I did break down the APS as well according to a document that I found on SAP site.
Here is what worked for me: we use DW relational connections for the universes, all our universes are UNX universes. In the connection there are options for: Array bind size, Array Fetch size and pooling timeout. I increased all those, array bind size to 250; Array fetch size to 32670 and pooling timeout to 20 mins and the dba set the ConnectInit to set star schema transformation. Once all these were enabled the report which was loading in 20 mins started refreshing in 6 mins.
For now things seem to be working fine but I will certainly raise the RAM request to the management but it would help if you could provide with some reference document. Thanks
Regards,
samique

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/people/prakash.darji/blog/2006/01/26/query-optimization
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https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/ce7fb368-0601-0010-64ba-fadc985a1f94
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Hello,
We have set-up SSO between SAP EP 701, SAP BI 701 and Business Object XI 3.1 to allow users to access reports without having to sign-on again as explained here :
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https://websmp106.sap-ag.de/~sapidb/011000358700001646962008E/XI3-1_BIP_SAP_INSTALL_EN.pdf
I've found a similar discussions here ;
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If we configure the Server Side Trust between BO Enterprise server and the SAP BI7 backend .
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I now have to provide some explanations to my managers, and to be honest , there are still some points that
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Best Regards.

Webi query performance in SAP BO 4.0 sp6

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