Datsource took more time in delta load

Hi

Datasoure 0REFX_4 usually brings in records (around 45000) in few seconds but took a lot of time (21 minutes) today for 38000 records. Looking at the job log i can see it took more time between Asynchronos transmission and call customer enhancement.

i have checked the below and found no issues.

SMQ1 for any stuck entries - None showing.

Any other jobs which ran at the same time, if they were affected - None affected.

Job Server busy - Not Busy.

Please can someone let me know what else can i look at to find the issue. Also what is this customer enhancement BW_BTE. Did the extractor take 20 mins in the call of the customer enhancement or it took 20 mins in the asynchronous transmission.

Thanks