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Next.js 14.2, Turbopack, Build Improvements, and More

Posted on:April 12, 2024 at 12:11 AM

Next.js 14.2: Turbopack, Build Improvements, and More

In the ever-evolving world of web development, Next.js has consistently been at the forefront of innovation. With the release of Next.js 14.2, the framework continues to push the boundaries, introducing a host of new features and enhancements to improve the developer experience and application performance.

This comprehensive article will explore the key highlights of Next.js 14.2, diving deep into the various improvements and advancements that this version brings to the table. From the highly anticipated Turbopack for development to the enhancements in build and production, we’ll cover it all.

Turbopack for Development (Release Candidate)

Over the past few months, the Next.js team has been working tirelessly on improving local development performance with Turbopack. In version 14.2, the Turbopack Release Candidate is now available for local development, and the results are nothing short of impressive.

Extensive Testing and Verification

The team has put Turbopack through rigorous testing, ensuring its stability and compatibility. They have verified that 99.8% of integration tests are now passing, and the top 300 npm packages used in Next.js applications can compile with Turbopack. Additionally, all Next.js examples have been tested and found to work seamlessly with Turbopack.

Integrating Lightning CSS

To further enhance the development experience, the Next.js team has integrated Lightning CSS, a fast CSS bundler and minifier written in Rust. This integration has contributed to the overall performance improvements observed with Turbopack.

Dogfooding Turbopack

The Next.js team has been extensively using Turbopack with Vercel’s applications, such as, a large Next.js app. The results have been remarkable, with the following improvements:

Up to 76.7% faster local server startup Up to 96.3% faster code updates with Fast Refresh Up to 45.8% faster initial route compile without caching (Turbopack does not have disk caching yet) Trying Out Turbopack To try out Turbopack, you can use the following command:

next dev --turbo

It’s important to note that Turbopack is currently opt-in, and the Next.js team will continue to focus on improving memory usage, implementing persistent caching, and integrating the next build —turbo command.

Build and Production Improvements

In addition to the advancements in local development, Next.js 14.2 also brings significant improvements to the build and production processes.

Reduced Build Memory Usage

One of the notable improvements is the reduced memory usage during the build process. The Next.js team has optimized the build process, leading to a more efficient use of system resources.

CSS Optimizations

Next.js 14.2 includes various CSS optimizations, enhancing the overall performance and efficiency of CSS-related tasks.


The new version of Next.js introduces more robust tree-shaking capabilities, allowing for better dead code elimination and improved bundle size optimization.

Build Memory Usage

The team has also focused on reducing the overall memory usage during the build process, ensuring a more efficient and streamlined build experience.

Caching Improvements

Caching is a crucial aspect of any web application, and Next.js 14.2 introduces several enhancements to improve the caching experience.

staleTimes (Experimental)

One of the key improvements is the introduction of the staleTimes feature, which allows for configurable invalidation periods. This feature gives developers more control over the caching behavior of their applications, enabling them to fine-tune the caching strategy to meet their specific needs.

Parallel and Intercepting Routes

Next.js 14.2 also includes improvements to the handling of parallel and intercepting routes. These enhancements help to ensure a more reliable and predictable caching behavior, leading to better overall application performance.

Errors DX Improvements

Improving the developer experience (DX) is a top priority for the Next.js team, and Next.js 14.2 delivers several enhancements in this area.

Better Hydration Mismatch Errors

One of the notable improvements is the enhanced handling of hydration mismatch errors. The team has worked to provide more informative and actionable error messages, making it easier for developers to identify and resolve such issues.

Design Updates

In addition to the technical improvements, Next.js 14.2 also includes design updates to the error reporting system. These updates aim to make the error messages more user-friendly and visually appealing, further enhancing the overall developer experience.

React 19

Next.js 14.2 also aligns with the latest version of React, React 19. This upgrade ensures that Next.js applications can leverage the latest features and improvements offered by React 19, further enhancing the development experience and application capabilities.

Other Improvements

Apart from the major highlights, Next.js 14.2 also includes a range of other improvements and enhancements, including:


The success of Next.js 14.2 is a testament to the hard work and dedication of the entire Next.js community. The Next.js team would like to express their gratitude to all the contributors who have played a vital role in shaping this release.


Next.js 14.2 is a significant milestone in the framework’s evolution, showcasing the Next.js team’s commitment to continuously improving the developer experience and application performance. From the groundbreaking Turbopack for development to the enhancements in build, production, and caching, this version of Next.js offers a wealth of new features and improvements.

As the web development landscape continues to evolve, Next.js 14.2 positions itself as a powerful and versatile tool, empowering developers to create truly remarkable web applications. Whether you’re a seasoned Next.js user or just starting your journey, this release presents an exciting opportunity to unlock new levels of efficiency, productivity, and innovation.