Hello,
We are migrating the jobs from 3.2 to 4.2 version SP1.
I would like to know what are the features provided in 4.2 purely with respect to performance of Batch Jobs! ( there is no Data quality here).
I am not looking anything related to architectural changes / new features introduced like text data processing.. 
So, please provide links where I can find how to tune performance in 4.2 which is not available in 3.2!
Thanks & Regards,
Amar.