Hi torsten, does it only happen during view orbiting? What about other mouse things like drawing?

Does the jump look like the mouse cursor gets larger for a moment? Maybe you're running into this new OS feature: https://www.tekrevue.com/tip/cursor-bigger-shake-to-locate-el-capitan/

Try going to your Mac system settings under System Preferences > Accessibility > Display and turn off "Shake mouse pointer to locate", does it go away after that?

- Michael