Params "--cores" have not established function for speeding up pipline

[Rochsen]

Hi, I try the params of ClassifyCNV.py, The '--cores' param have not useful for speeding up analysis program.
I set '--cores' with 1,2,4,8,16, but the effect is not obvious, now I put the test data below:

--cores value	running time	cnv number
1	27.56 seconds	200
2	27.20 seconds	200
4	27.19 seconds	200
8	27.27 seconds	200
16	27.33 seconds	200

What should I do, If I fail to correctly use ClassifyCNV.py "--cores", please tell me what I error. Thanks.