Somehow, I’m getting the impression that Unity Plus is better performance wise than Unity Personal. I wonder if that’s probably why a simple ball(with a rigidbody but without a camera following) rolling on a plane jitters a lot on my Intel i7 Quad Core 6700 with 16GB DDR4 Ram and equipped with an NVidia GTX 960 GPU? I’m also wondering why the Personal edition may not suffice for serious publishing purposes?
There is no performance difference between different licenses. Except for absolute loading time when you launch the app, because of the forced splash screen if your game loads faster than the Unity splashscreen duration.
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Some people would claim that’s post-purchase rationalization. Regardless of the reason though the actual engine itself is identical between all three tiers. What isn’t the same are options related to the splash screen and the dark skin. That’s it.
http://io9.gizmodo.com/5974468/the-most-common-cognitive-biases-that-prevent-you-from-being-rational
If an actual performance difference existed it wouldn’t be covered up. We love to compare engines far too much for that. 
Some people dislike the splash screen enforced by Unity Personal.
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Performance is the same between Unity Plus and Unity Personal.
If you are getting jitters in your game, then start a thread to discuss that. Include a video showing the problem you are seeing.
If the jitters only occur some of the time, it is possible the jitters are related to floating point precision differences at different locations in the scene. You have the highest precision at the origin (0,0,0). If you get really far away from the origin, you have less precision, so you will see jitters.
It is also possible that something else is going on. Use the Unity profiler to examine what is costing time per frame. If there is a performance problem, you can probably track it down using the Unity profiler.
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Any serious publishing effort will likely hit the personal revenue cap pretty quickly.