To be honest, it is a very new component and I'm building a testing environment for it to see if I can get the same issue as yours. I'll come back to you asap, sorry for the inconvenience.
What does your job design look like? Could you please upload your job design screenshots into forum?
This case is years old and this performance concern on 5.3 was improved greatly however there was no wok around but to upgrade to the latest release. I would recommend attaching your configuration for the commit every, the batch size, the version and other information because it is not possible this is the same issue as before even if the performance is not great for you.
Talend named a Leader.
Kickstart your first data integration and ETL projects.
Watch the recorded webinar!
Pick up some tips and tricks with Context Variables
Learn how media organizations have achieved success with Data Integration
Practical steps to developing your data integration strategy.