XSDS huge performance issue

Hi

I'm using XSDS extensively in my project. However, there is a huge performance issue with even small update/inserts to the data.
From the blog and PPT I got to know that I should do all the imports of the entities in an xsjslib file, rather than each xsjs file to improve performance.
I created a library with all the 8-9 entities that I need for the entire project. Not all these entities are used in all the xsjs files.

Should I create a separate xsjslib file for each entity?
I read in the blog that we can serialize the imports, can you please tell me how it's done?

Thanks