Include Cleanup and Diagnostics in Visual Studio
summary
Run Visual Studio Build Insights to find costly headers (project build drops from 461s to 334.12s after cleaning one file), enable Include Cleanup at Tools > Options > Text Editor > C++ > Code Cleanup, then choose Optimize include graph to remove unused includes and add transitively required headers; enable Include Diagnostics from the editor context menu to show CodeLens counts and build-time per header and click references to jump to uses.
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