Hi Swapnil,
Please don't compare DEV with PRD server though even flow & volume of records are same there are many other factors which influence on extraction recently we had data extraction issue on FI_GL_4 datasource as per SAP suggestion we have built secondary indexes on table BWFI_AEDAT table & other base tables.
Though even after doing many settings there is no much improvement in the process
So i'll appeal you after triggering infopackage please wait for while some time it may take 1-2 hour to start extraction itself.
Regards,
Harish