If our application is content rich and used across multiple locations, we can

use Amazon CloudFront to increase its performance. Some of the techniques

used by Amazon CloudFront are as follows:

Caching: Amazon CloudFront caches the copies of our application’s content at

locations closer to our viewers. By this caching our users get our content very

fast. Also due to caching the load on our main server decreases.

Edge / Regional Locations: CloudFront uses a global network of Edge and

Regional edge locations to cache our content. These locations cater to almost

all of the geographical areas across the world.

Persistent Connections: In certain cases, CloudFront keeps persistent

connections with the main server to fetch the content quickly.

Other Optimization: Amazon CloudFront also uses other optimization

techniques like TCP initial congestion window etc to deliver high performance

experience

https://aws.amazon.com/blogs/networking-and-content-delivery/improve-your-website-performance-with-amazon-cloudfront/