# Optimizing Our Build Times by Migrating from Webpack to Rspack

DevFeed: [Optimizing Our Build Times by Migrating from Webpack to Rspack](<https://devfeed.tech/articles/optimizing-our-build-times-by-migrating-from-webpack-to-rspack-27426.md>)

Original publisher: [Read original article](<https://engineeringblog.yelp.com/2026/05/optimizing-our-build-times-by-migrating-from-webpack-to-rspack.html>)

Author: Benson Pan, Software Engineer

Published: 2026-05-20T00:00:00Z

Content type: tutorial

Language: en

Sources: [Yelp](<https://devfeed.tech/sources/yelp.md>)

Topics: [Webpack](<https://devfeed.tech/topics/webpack.md>), [build times](<https://devfeed.tech/topics/build-times.md>), [monorepo](<https://devfeed.tech/topics/monorepo.md>), [build performance](<https://devfeed.tech/topics/build-performance.md>), [Developer experience](<https://devfeed.tech/topics/developer-experience.md>)

Tags: [build](<https://devfeed.tech/tags/build.md>), [build-times](<https://devfeed.tech/tags/build-times.md>), [build-tools](<https://devfeed.tech/tags/build-tools.md>), [developer-experience](<https://devfeed.tech/tags/developer-experience.md>), [migration-guide](<https://devfeed.tech/tags/migration-guide.md>), [monorepo](<https://devfeed.tech/tags/monorepo.md>), [performance](<https://devfeed.tech/tags/performance.md>), [speed](<https://devfeed.tech/tags/speed.md>), [tooling](<https://devfeed.tech/tags/tooling.md>), [tools](<https://devfeed.tech/tags/tools.md>), [webpack](<https://devfeed.tech/tags/webpack.md>)

## AI overview

A Yelp engineering blog post explains how the team migrated monorepo builds from Webpack to Rspack. It reports an approximately 50% reduction in build time and discusses compatibility, configuration, custom plugins, and a staged rollout.

## Source excerpt

Over the years, Webpack has remained the bundler of choice for many JS projects, including here at Yelp. While it has served us well, its speed has increasingly become a bottleneck as our monorepo continues to grow. Fortunately, a bunch of new build tools (Vite, Parcel, Rspack, etc.) have emerged in recent years. Each of these tools promises different ways of improving performance and developer experience. In this blog post, we'll walk through how we migrated our monorepo builds from Webpack to Rspack and achieved an approximately 50% reduction in build time. Why Rspack Our team has been closely observing...