Datasource Extraction?how mnay records process from BW datasource to r3

I have a data source in BW. How can I find out that if, how many records does it process at once when it tries to retrieve data from R/3? How can I change the setting? What is standard?

The issue is I got 46000 records in a table and when I try to use my extractor in u201CRSA3u201D when given more records to pull instead of 100, at once it takes forever? So how does BW data source pulls data, does it also pulls 100 records at once or more?