To create fast websites, it's essential to measure and optimize server speeds and minimize client burden. This can be achieved by pre-rendering pages at build-time or using partial prerendering to serve static parts while streaming dynamic bits. Caching fetch requests can also help reduce server response times. To speed up page render, minimizing JavaScript bundle size, reducing the impact of hydration, and loading fonts and images efficiently are crucial. Tools like `next/image` can be used to optimize image loading, and solutions like Mux or Cloudinary can help with video delivery. Finally, providing optimistic UI feedback for user interactions can make websites more engaging and improve overall performance.