You'll need to reduce the size of the video capture settings in both dimension and fps.  The video capture is heavily cpu-intensive and will interfer when capturing another application that is cpu intensive.  There is support information concerning this in the manual:

On the machine side, reduce your monitor resolution, and capture the smallest area of the screen as possible. Quit as many other applications as you can as they use up extra CPU cycles. On the Snapz Pro X 2 side, reduce the framerate, deselect all of the audio options, and select Fixed Camera.

Optimizing video recording is explained more in the Snapz Pro X 2 Manual in the section called, "Getting the Smoothest Video Possible".

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