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That sounds both very frustrating, and quite bizarre. I can't imagine why ambient light sensing would need to peg the CPU ever.

If you haven't done so already, I strongly encourage you to file a bug report with Apple at https://bugreport.apple.com

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I have filed a bug report. But yeah, it’s crazy that one part of the machine makes all the rest of it slow down! There was a time before I figured out it was the Touch Bar when I thought it was _moving fast_ that was making it lag (because it didn’t happen when the train stopped at stations). I was paranoid that it was trying to keep tabs on my location... so it could be worse, I guess.

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