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Performance issue when mixing managed and unmanaged C++ with OpenCV

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I have written a motiontracker program in native C++ with OpenCV, now I would like to implement a nice GUI to it.

Because windows forms is very easy to work with I wanted to try to mix managed and unmanaged code with C++/CLI.
It was very easy to load my unmanaged C++ code in C++/CLI but when I run it the FPS decrease from 43 to 22 I never thought it would be such a big difference.
I just loaded my unmanaged object from the main managed class without having any form or anything but still this decrease in performance.

Is there any better and faster way of using windows forms with native C++ code?
Maybe sharing memory between a C# winforms app and the native C++ program pherhaps could be a good way, do you have any ideas?

Any help would be appreciated.

Best regards Zeiko

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