Here’s the the thing, the is a standard set of algorithms to solve the Rubix cube, and they are fairly easy to do but not the fastest way. The fast set of algorithms involves memorizing more algorithms to solve it more efficiently.
After countless hours of practicing, you stop using the algorithms and start going by the “feel” of it. This is when you start to get fast, because you are not having to remember each step.
There are also special techniques such as flicking, that will rotate the aides quicker than you can normally. It’s crazy fast. It’s so fast your eyes cannot alway process the movement and it just become a blur.
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