HT2712 How do I delete wireless networks that my computer keeps detecting?

My iMac keeps detecting other wireless networks in the neighborhood which slows down or prevents it from connecting to my wireless network. Is there a way to block those other networks?

cortiz58 wrote:
My iMac keeps detecting other wireless networks in the neighborhood
Which is normal.
........which slows down or prevents it from connecting to my wireless network.
I'm not sure that it does. What makes you say that? It might be that the others are on the same wireless channel as yours with a very strong signal and are interfering?

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