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I bought a YellowJacket to mine bitcoins. I'm using my raspberry pi to test it.
My actual configuration is: Raspberry pi using the usb from a laptop. With 1 yellow jacket. Software cgminer 4.9.2
My question is why I get so low speed? What I can do to improve my speed ?

Did you try getting a USB hub? – Nick ODell – 2015-07-16T03:24:23.037
No, I'm using connected to my lap top.@NickODell – AFetter – 2015-07-16T04:12:44.883
If you haven't changed your configuration, isn't this a duplicate of your first question? – Nick ODell – 2015-07-16T04:46:22.543