Does Cloudflare have any features specifically designed to improve the performance of websites accessed via older mobile networks (e.g., 3G)?

Yes, Cloudflare's features like Rocket Loader, Mirage, and Polish are particularly beneficial for users on slower mobile networks. Rocket Loader reduces the impact of JavaScript on page load times, while Mirage and Polish optimize images to reduce file sizes. These optimizations help websites load faster and consume less bandwidth, resulting in a better user experience on 3G and other slower connections. Using Brotli compression is also very effective.