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How CPU profiling revealed an unguarded moduleGraph.isDeferred() call in webpack ConcatenatedModule, the fix that landed upstream in webpack >= 5.108.0, and roughly 11 minutes saved on a large Module Federation build.
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Understanding how complex systems work and debugging them
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A practical guide to capturing CPU profiles from Next.js production builds and using cpupro to isolate hotspots and form a hypothesis before diving into source code.