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Welcome back, performance is one of the greatest benefits of SvelteKit. The hard jobs that make creating performant applications so difficult come for free with Sveltekit. It uses a tool called Vite, with a Svelte plugin, to provide instant server starts, lightning-fast development with hot module reloading, bundling, and the code-splitting that optimizes your code for production.

Code-splitting is breaking up your app to improve the page loading time by only using what is needed for the current page. Instead of a single JavaScript bundle, it splits each route into it’s own chunk. It is essentially a fancy name for dynamic imports. This creates an optimized, production ready version of your application. Now, let’s move on to file system based routing.