Job is taking too much time during Delta loads

hi
when i tried to extract Delta records from R3 for Standard Extractor 0FI_GL_4 it is taking 46 mins while there are very less no. of delta records(193 records only).
PFA the R3 Job log. the major time is taking in calling the Customer enhacement BW_BTE_CALL_BW204010_E.
please let me know why this is taking too much time.
06:10:16 4 LUWs confirmed and 4 LUWs to be deleted with FB RSC2_QOUT_CONFIRM_DATA
06:56:46 Call up of customer enhancement BW_BTE_CALL_BW204010_E (BTE) with 193 records
06:56:46 Result of customer enhancement: 193 records
06:56:46 Call up of customer enhancement EXIT_SAPLRSAP_001 (CMOD) with 193 records
06:56:46 Result of customer enhancement: 193 records
06:56:46 Asynchronous sending of data package 1 in task 0002 (1 parallel tasks)
06:56:47 IDOC: InfoIDOC 2, IDOC no. 121289649, duration 00:00:00
06:56:47 IDOC: Begin 09.05.2011 06:10:15, end 09.05.2011 06:10:15
06:56:48 Asynchronous sending of InfoIDOCs 3 in task 0003 (1 parallel tasks)
06:56:48 Through selection conditions, 0 records filtered out in total
06:56:48 IDOC: InfoIDOC 3, IDOC no. 121289686, duration 00:00:00
06:56:48 IDOC: Begin 09.05.2011 06:56:48, end 09.05.2011 06:56:48
06:56:54 tRFC: Data package 1, TID = 3547D5D96D2C4DC7740F217E, duration 00:00:07, ARFCSTATE =
06:56:54 tRFC: Begin 09.05.2011 06:56:47, end 09.05.2011 06:56:54
06:56:55 Synchronous sending of InfoIDOCs 4 (0 parallel tasks)
06:56:55 IDOC: InfoIDOC 4, IDOC no. 121289687, duration 00:00:00
06:56:55 IDOC: Begin 09.05.2011 06:56:55, end 09.05.2011 06:56:55
06:56:55 Job finished
Regards
Atul

Hi Atul,
Have you written any customer exit code . If yes check for the optimization for it .
Kind Regards,
Ashutosh Singh

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A.1.6 Connection Timeouts Through a Stateful Firewall Affect System Performance
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