UWL Performance issue

We have recently configured UWL Delta pull mechanism. We got some issues, manual refresh by selecting Refresh action from the tray icon on the UWL inbox, the refresh time is very long and it takes more than 10 mins most times.

Another issue is, we see below error message in the log file

java.lang.Exception: Problem retrieving JCO.Function object object while reading R3 system information.

at com.sap.netweaver.bc.uwl.utils.r3.R3SystemInfo.createJCOFunction(R3SystemInfo.java:88)

at com.sap.netweaver.bc.uwl.core.connect.abap.functions.UwlGetItemsProxy.execute(UwlGetItemsProxy.java:55)

at com.sap.netweaver.bc.uwl.core.connect.abap.OptimizedRetriever.getItems(OptimizedRetriever.java:95)

at com.sap.netweaver.bc.uwl.core.connect.webflow.WebflowConnector.getItems(WebflowConnector.java:2039)

at com.sap.netweaver.bc.uwl.core.pull.PullChannel.getItems(PullChannel.java:52)

at com.sap.netweaver.bc.uwl.core.pull.PullThread.run(PullThread.java:64)

at com.sap.netweaver.bc.uwl.core.pull.PullChannelManager.beforeAssigningUserToChannel(PullChannelManager.java:399)

at com.sap.netweaver.bc.uwl.core.pull.PullChannelManager.assignUserToChannel(PullChannelManager.java:427)

at com.sap.netweaver.bc.uwl.core.pull.PullChannelManager.onUserLoggedIn(PullChannelManager.java:236)

at com.sap.netweaver.bc.uwl.core.session.SessionEventDispatcherThread.run(SessionEventDispatcherThread.java:29)

at com.sap.netweaver.bc.uwl.core.ThreadManager$PoolWorker.run(ThreadManager.java:191)

Could anyone shed some light what possibly could be happening and how to fix it?

We have custom webflow connector XML file to connect to backend system where all task ids are defined.

Thanks

Siva