Benchmark ApiImport

Here is a benchmark done with :
Ubuntu 13.10 64bits
8Gb RAM
i5-4250U CPU @ 1.30GHz × 4

I did only one test per data.
One product exported is composed of 2 store views so each product is composed of 2 rows.

Subject is to find how to reach the best performance with Api Import.
Is it better to send all your products with only one Soap call or is it better to use more call ?

Link to see data

You can notice that you reach better performance sending bulk of 2500 rows if you send more than 10K rows.
To import 100K rows sets approximately 11 minutes sending by group of 2500 rows with ApiImport instead of almost 6 days (if it can work) with default Magento Soap Api.