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Interactive rendering in Cycles can require a lot of computing power; it uses the graphics card as well as the CPU in your system. So, if you have a fast graphics card and a fast CPU, you should be okay, but you can change the amount of quality of your render to get the most out of your system. So, if we go over here to the Render tab, we can scroll down to Sampling--it's a rollou--and under Samples we have Amount of Samples for Preview and the higher the number, the higher the quality of the Preview.
So let me go ahead and start Rendered Shading in my Viewport and at the default, which is 10, you can see we get a lot of pixilation. Now this may be just perfectly fine to see how it's going to render, but if you need more quality, you can up this value. Now by bringing this value up, you add render time. But the nice thing about this is that as you move the Viewport, it always starts back to 0 and then it will just gradually fill in, so if you just let it sit there, it will go ahead and start filling in the details.
Now if you don't need that, you can certainly bring this number down or you can bring it up, just depending upon how much quality you want to see in your Viewport.
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