Optimize Code

I have this code, which works, but it is incredibly slow. I have been trying to find a way to optimize it but can't. I thought about selecting all the rows first, and then hiding selection, but can't figure that out. I also thought about selecting/hiding ranges at time, rather than individual rows, but can't figure that out either. Any help would be appreciated.

Objective: Hide all rows within a range that contain "" within column 6.

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