If you’re working on web applications today, you might have heard that re-renders are bad for performance. But why is that exactly? And more importantly – how can we spot these performance issues in our Svelte and SvelteKit applications? In this post, I’ll introduce you to svelte-render-scan, a visual debugging tool I created that helps you see exactly when and where your Svelte components are updating the DOM. We’ll explore why re-renders matter, how Svelte’s approach differs from ...
