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Fix perfomance issue in updating addr book #141
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Stebalien
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1. Remove duplicate import. 2. Lift empty check to simplify code. 3. Use a more efficient map key (go will optimize this to not allocate).
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After recent upgrade to latest libp2p libraries I saw that my app runs 10% cpu in idle. After debugging I found that this function sometimes do 40000*80000 (1-4 billion) iterations. I don't known why it gets so many addresses (on average there is only 10-200 addresses), so I only fix this complexity issue.