" Intermittently, users are reporting system freezing e.g in editing a report and cannot exit it/log off etc."
If you are using the "Rich Internet Application" to edit a Webi report, you can add the -Xmx1024m -Xincgc to your JRE1.6.x, where
-Xmx<size> set maximum Java heap size. Note that 1024m is just an example, -Xmx848m (windows 2003) -Xmx664m (Windows XP), etc. You'd need to adjust it to the highest size your PC OS is allowed.
-Xincgc enable incremental garbage collection
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Help this helps,
Jin-Chong