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I installed Mac OS sierra yesterday night in my MacBook Air13" (4gb) I also use an external SSD (Samsung T3).Today I could not do any task because of CPU and ram usages.First, I thought this is because of new OS, but then I check activity monitor and saw kernel_task use around 50-70% percent of CPU.I wonder, what it is and how I can fix this problem (I found some entries in the forum, but I am not sure this is the same problem or not).Thank you.