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Very Slow Booting High Sierra Update

Last Saturday I updated my MacBook Pro mid 2011, 2,8 GHz Intel Core i7, 240GB SSD, from OSX Sierra to the new High Sierra. The computer is running very fast and stable but I found an issue on the booting time. Before the update booting last at most 18 seconds and now it takes 10 MINUTES!!!!!! Really.... 10 Minutes.... What can I do to solve this problem?

Thank you very much for any help you can give me!

最後更新：2017-10-09 07:55:30

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