I see no readily available Google search results that answer this question. What is it, and what is it used for?
IntelliJ power save mode is indicated by a Hector icon on the Status Bar at the bottom. If IntelliJ is running in power save mode, the Hector Icon will be faded
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In Power Save Mode, no code inspections are performed. Click on the hector icon to toggle the power save mode. https://www.jetbrains.com/idea/help/status-bar.html