Optimizing Frontend Build Times: Lessons from Railway's Next.js Migration

Dramatically reduce frontend build times by analyzing current bottlenecks and strategically migrating to more efficient frameworks or build tools, as Railway did to cut build durations from 10+ minutes to under 2 minutes.

intermediate1-2 hours5 steps

The play

Benchmark Current Build Performance
Measure your project's current build times locally and on your CI/CD pipeline. Use `time` command for local builds and review CI/CD logs for step-by-step durations. ```bash # For Unix-like systems time npm run build # For PowerShell (Windows) Measure-Command { npm run build } ```
Identify Build Bottlenecks with Bundle Analysis
Install and configure a bundle analyzer (e.g., `@next/bundle-analyzer` for Next.js) to visualize your build's composition. This helps pinpoint large dependencies or unoptimized assets contributing to slow builds. ```bash npm install --save-dev @next/bundle-analyzer # or yarn add --dev @next/bundle-analyzer ``` Then, add the configuration to your `next.config.js` (see 'Copy-Paste Starter'). Run `ANALYZE=true npm run build` to generate the report.
Evaluate Framework and Tooling Impact
Assess whether your current frontend framework (e.g., Next.js, CRA) or build tools (e.g., Webpack) are a primary cause of slow builds, especially for large or complex projects. Consider if newer tools leverage modern build practices more efficiently.
Prototype Faster Alternatives
If your current stack is a bottleneck, create small Proof-of-Concepts (POCs) with alternative frameworks or build tools (e.g., Vite, SvelteKit, Astro, Remix) to compare build times and development experience.
Plan and Execute Strategic Migration
Based on successful POCs, develop a phased migration strategy for your application to the more performant framework or build tool. Prioritize critical components or new features for the migration.

Starter code

module.exports = require('@next/bundle-analyzer')({
  enabled: process.env.ANALYZE === 'true',
})({});