The database and the deployment
A fast site starts with the data. Supabase gives you a Postgres database with no server to manage, but connections need to be pooled with PgBouncer to keep up when traffic grows.
Server Components and data loading
React Server Components (RSC) read data directly on the server. There are fewer round trips, and the browser has less code to download.
Pages built ahead of time
Static pages, rebuilt a little at a time, keep the same speed even when many visitors arrive at once.