Generally all stages(filter,surogate,row,coulmn generator etc....exept transformation stage) are run in orchistation scripting language (OSH).
But Transformation stage will run on C++ code.
If the job having transfromation stage then that job will be run in OSH code and C++ code.
C++ code is not part of in datastage. So the job will Take more time to execute
This the disadvantage