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But you can solve it yourself
Windows 11 Insider Preview has been suffering from a CPU overload issue for several weeks now.
This issue was originally reported on the Microsoft community forums earlier this month. Unfortunately, Microsoft still hasn't released a fix. According to Neowin, Microsoft engineer Jennifer Gee said, “We appreciate your patience as we have identified the cause and are working to resolve it.” This was a week ago, but the problem has not yet been resolved.