[Python] Calling Python Functions from Java (Without Jython, because it is too slow.)

I need to be able to call Python functions from Java, and get the return of those functions, which should be primitives only.
I also don't need to access Java objects in Python or other stuff like that.
But, most of all, I need speed. I need to be able to load the script at the start of my application and then call some functions at different time-intervals, which can sometimes get really tiny (30-40 times per second).
That's the main-reason why I don't think that Jython will work for me: It has all kinds of stuff that I don't need, and is incredibly slow.

So, those are the constraints/requirements I have:

• Needs to be fast
• I need to call python functions and get their result
• The script should be loaded only once

Do you guys know about another way to simply call Python functions in a pre-loaded script (So that the script does not have to be loaded again and again for each function call)?

(PS: I do not think that this is a duplicate as I searched quite a lot and all links I found did not answer my question (For example Calling Python in Java?) )

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