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Just after upgrading to Big Sur 11.4, my aging iMac has taken to stall every now and then with kernel_task taking up most of the CPU, which is tremendously annoying as it becomes unresponsive even when I’m using it as a souped-up thin client to access my corporate virtual desktop environment. I can only partially blame the upgrade as warmer weather is in full swing again, with my office warming up to 22oC early in the morning as sunlight streams in and slowly going past the 27oC mark as the day ...