[Xevi]

Vite only uses Rollup for the production build step. During development it uses ESBuild for pre-bundling, and then serves everything as native ESM, that's why it's so fast. They might get rid of Rollup in the future if ESBuild gains more features.

[FinalBriefing]

oh, cool! I didn't realize that. Then yea, I am very impressed by esbuild's performance.