After the Mountain Lion 10.8.2 upgrade my system is VERY slow, online connection down miserably. WHat has happened and how do I go back to 10.8.1?

Upgraded my Macbook Pro tonight to 10.8.2....horrible move, internet connection is now a slow crawl. Was very fast before upgrade. IF no known fix how do I go back to 10.8.1?

I had the same problem.  My solution was to reset the SMC on my 2010 Macbook Pro and now my internet speed is back to normal.
To reset the SMC, shut down the computer completely.  Then hold SHIFT+CONTROL+OPTION on the left hand side of the keyboard AND the Power key for at least 2 seconds.  Release all the keys, then repower the laptop normally using the power key. 
Hope this helps.

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