Portal display chart of BI reporting seriously damage system

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Here is the environment of our NW04s system landscape:

1. BI 7.0 server: AIX/AS_ABAP/AS_java/BI_ABAP/BI_java

2. Portal 7.0 server: Windows2003/EP/AS_java/BI_java

and we already patch all components (BI_ABAP/EP/BI_java) to latest SP9, even more we patch IGS java and ABAP both to latest SP5.

when we double click the report link which is stored in Favorites links in BI ABAP initial logon screen, the report appears without any problems.

However we face the following serious problem:

when we switch the report display from "Table" to "Chart", the whole AIX system runs very very slowly, meanwhile BI system works like deadlock and finaly we have to restart the AIX server:-(

To our strange with further investigation, if we execute the report with little volumn of data(say 4 lines of the layout), everything is ok including the Chart display, but if we execute the report with big volumn of data(say 600 lines of the layout), the chart display cause the system dead, furthermore, if we scroll down the 600-line layout with 10 pages for example, it also cause the system dead(but the scroll down behavior works fine in RSRT)!

any expert can give me a hint? we are struggling for this problem for several days and nights.

Thanks in advance!

Patrick