Published onJuly 11, 2026Finding a Redundant Traversal in Webpack With CPU Profilingwebpackperformancecpu-profilingmodule-federationopen-sourceHow 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.