When you still happen to have the original shipped power unit, which delivers 5.0V, it could cause performance drops when using an ethernet adapter.
Athom communicated the issues with the first batch of power units, and offered to have it replaced by a 5.2V model, free of charge.
See this post:
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Only looking at the CPU graph is not a good indicator, maybe it just doesn’t need to step up.
You’d look at this value to discover low voltage issues:
