Profiling SvelteKit Apps
Use browser DevTools, Lighthouse, and Vite bundle analyzer to find bottlenecks.
Profiling SvelteKit Apps is a free Sveltejs Academy lesson on CoddyKit. This is lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Sveltejs Academy learning path, and your progress syncs across the web and the CoddyKit app. The Sveltejs Academy course includes 4 lessons in total.
Browser DevTools
Use the Performance tab to record interactions and find bottlenecks.
Lighthouse
Run Lighthouse on production builds for Core Web Vitals scores and actionable hints.
Network Tab
Inspect waterfall, payload sizes, and caching headers.
Bundle Analyzer
Install vite-bundle-visualizer to see what is in your bundles.
npm install -D vite-bundle-visualizerCPU Profile
The CPU tab in DevTools shows hot functions. Look for long tasks during interaction.
Memory Profiling
Use the Memory tab to detect leaks: take snapshots, navigate, take more, compare.
Core Web Vitals
Track LCP, CLS, INP in production via Real User Monitoring tools.
Source Maps
Production source maps make profile output readable. Balance with source-map exposure.
Real Devices
Test on mid-range phones, not just your laptop. Performance varies wildly.
Throttling
Throttle CPU and network in DevTools to simulate slower devices.
Continuous Monitoring
Set up alerts on Lighthouse CI or other tools so regressions get caught early.
Quick Check
What does Lighthouse measure?
Recap
Profile with DevTools, Lighthouse, and bundle visualizers. Test on real devices and monitor in production.
Learn HTML with an AI tutor — free
Write and run real code in your browser, get instant help from a 24/7 AI tutor, and pick up where you left off on the web or in the app.
- Courses
- 41
- Lessons
- 163
Frequently Asked Questions
Is the “Profiling SvelteKit Apps” lesson free?
Yes — the full text of “Profiling SvelteKit Apps” is free to read here on the web. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Sveltejs Academy course, upgrade to CoddyKit PRO. The Sveltejs Academy course includes 4 lessons in total.
What will I learn in “Profiling SvelteKit Apps”?
Use browser DevTools, Lighthouse, and Vite bundle analyzer to find bottlenecks. You practise Sveltejs Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Sveltejs Academy?
No prior experience is required. Sveltejs Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 4 of 4.
How long does the “Profiling SvelteKit Apps” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Sveltejs Academy lesson?
Yes. Every Sveltejs Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Code Splitting and Dynamic Imports
- Optimizing Images with @sveltejs/enhanced-img
- Lazy Loading Components
- Profiling SvelteKit Apps