Siebel Change Capture for S_PRSP_CONTACT

Hi All,
We have BI Apps 7.9.6.1 with Siebel as our OLTP system. The problem we are facing currently is the change capture task for 1 table viz., S_PRSP_CONTACT which is a huge partitioned table takes very long time for us. The following is the Insert query in the change capture which is taking looong time,
INSERT /*+APPEND*/ INTO siebel.S_ETL_I_IMG_30
     (ROW_ID, MODIFICATION_NUM, OPERATION, LAST_UPD)
SELECT
          ROW_ID
          ,MODIFICATION_NUM
          ,'I'
          ,LAST_UPD
     FROM
          siebel.S_PRSP_CONTACT
     WHERE
          S_PRSP_CONTACT.LAST_UPD > TO_DATE('2011-05-06 00:16:32', 'YYYY-MM-DD HH24:MI:SS')
          AND NOT EXISTS
          SELECT
               S_ETL_R_IMG_30.ROW_ID
               ,S_ETL_R_IMG_30.MODIFICATION_NUM
               ,'I'
               ,S_ETL_R_IMG_30.LAST_UPD
          FROM
               siebel.S_ETL_R_IMG_30
          WHERE
               S_ETL_R_IMG_30.ROW_ID = S_PRSP_CONTACT.ROW_ID
               AND S_ETL_R_IMG_30.MODIFICATION_NUM = S_PRSP_CONTACT.MODIFICATION_NUM
               AND S_ETL_R_IMG_30.LAST_UPD = S_PRSP_CONTACT.LAST_UPD
The above query almost runs for 2 hours. Can anyone suggest me how to improve performance.......
Regards,
Venkatesh

Hi,
Any help would be greatly appreciated............
Regards,
Venkatesh

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