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Random Freezes In Sierra -Dell Optiplex 755

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So I installed Mac OSX Sierra on my Dell optiplex 755 through a guide I found on this forums and got everything working. Now I only have one problem, I am having random performance drop, looking at activity monitor it looks like opening this forum site uses 100 percent of my CPU, and even scrolling take a while.


My Specs:


Dell Optiplex 755

Intel Core 2 Duo E8400


Radeon HD5450 1GB



Any clue on what the problem might be.

Thanks for your help.

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