Next.js Performance Monitoring: Complete Setup Guide

Slow Next.js applications lose users. Performance monitoring helps you identify bottlenecks, track regressions, and keep your app fast as it grows.

Getting Started

Setting up performance monitoring in your Next.js project with Bugsly is straightforward. The entire process takes just a few minutes, and you'll immediately start seeing events in your dashboard.

Installation

npm install @bugsly/nextjs

Configuration

// next.config.js
const { withBugsly } = require("@bugsly/nextjs");

module.exports = withBugsly({
  bugsly: {
    dsn: "YOUR_BUGSLY_DSN",
    tracesSampleRate: 1.0,
  },
});

Verification

After adding the SDK, trigger a test error to confirm everything works. Check your Bugsly dashboard — the event should appear within seconds, complete with stack trace and context data.

Best Practices for Next.js Performance Monitoring

Group by fingerprint. Bugsly automatically groups similar errors, but you can customize fingerprinting for Next.js-specific patterns like route-based grouping or middleware errors.

Filter noise early. Use beforeSend to drop expected errors — like 404s from bots or network errors from flaky connections — before they consume your event quota.

Track releases consistently. Bugsly correlates errors with specific releases, so always set the release version. This makes it trivial to identify which deploy introduced a regression.

Monitor performance alongside errors. With tracesSampleRate enabled, Bugsly captures transaction data too, connecting slow endpoints with their associated errors for a complete picture of your Next.js application's health.

Next Steps

With performance monitoring in place, set up transaction-level alerts for endpoints that exceed your response time targets. Use Bugsly's performance dashboard to track web vitals and identify the slowest transactions. Enable profiling to get function-level performance data for your most critical code paths.