You should probably go to View-Performance Meter and pay attention to RT CPU.
You'll notice starting from the far right there will be a graph with two lines (black and green). The black represents your overall CPU utilization, and the green represents RT CPU (RealTime CPU). Playback your project while watching the performance meter. Every time the project gets glitchy, I'd be willing to bet you'll see a spike in RT CPU. This ordinarily shouldn't happen.
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