Next.js Performance Optimization: From 3s to 0.8s Load Time

Our DockForge application was loading in 3.2 seconds. Here's the full playbook we used to get it down to 0.8s — including the profiling workflow we ran before writing a single line of optimization code. ⚡ Step 0: Real-World Profiling Workflow The biggest mistake teams make is optimizing by instinct. Before touching anything, build a baseline with real data. Run Lighthouse in CI, not just DevTools DevTools Lighthouse runs on your machine with your hardware. For consistent results, use the CLI: npm install -g lighthouse lighthouse https://your-app.com --output = json --output-path = ./report.json \ --chrome-flags = "--headless" --throttling-method = simulate Or integrate it into CI so every PR shows a score diff: # .github/workflows/lighthouse.yml - name : Run Lighthouse uses : treosh/lighthouse-ci-action@v10 with : urls : | https://staging.your-app.com budgetPath : ./budget.json uploadArtifacts : true Use Chrome DevTools Performance tab properly Open DevTools → Performance tab Click the