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Between 7.0 and 7.1 the kernel was changed to run the CPU at the highest speed when on mains power, sometimes this is fine, sometimes it causes issues.
Some people are working around this by using obsdfreqd, some by patching sys/kern/sched_bsd.c (change if (hw_power) to if (0 && hw_power)), some by simply setting to a lower speed (sysctl hw.perfpolicy=manual and hw.setperf=99 might be enough as this disables turbo mode found on some CPUs).