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That tracks with my experience, since I don't prefer the IDE, because I need a build system that generates unique IDs and conditionally compiles stuff and handles debug flags. Also it needs to be reproducible and run unattended. In addition a build system is way faster. Arduino almost spends half of the build time on reanalyzing the project files to find out, what it actually needs to do and then it creates build artifacts in a random location. That's all problems you don't have with a proper build system, so the build system ends up way faster. I think Arduino also doesn't support parallel compilation.