https://www.shashankupadhyay.me/blogs Understanding how complex systems work and debugging them en-us shashankupadhyay.work@gmail.com (Shashank Upadhyay) shashankupadhyay.work@gmail.com (Shashank Upadhyay) Sat, 11 Jul 2026 00:00:00 GMT https://www.shashankupadhyay.me/blogs/finding-a-redundant-traversal-in-webpack-with-cpu-profiling https://www.shashankupadhyay.me/blogs/finding-a-redundant-traversal-in-webpack-with-cpu-profiling 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. Sat, 11 Jul 2026 00:00:00 GMT shashankupadhyay.work@gmail.com (Shashank Upadhyay) webpackperformancecpu-profilingmodule-federationopen-source https://www.shashankupadhyay.me/blogs/how-to-identify-build-time-bottlenecks-using-cpu-profiling https://www.shashankupadhyay.me/blogs/how-to-identify-build-time-bottlenecks-using-cpu-profiling 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. Sat, 04 Jul 2026 00:00:00 GMT shashankupadhyay.work@gmail.com (Shashank Upadhyay) performancecpu-profilingnext-jswebpack