“When you’re streaming video or audio, you can use Lambda@Edge to create and serve the right segments on-the-fly reducing the need for origin scalability,” explained Amazon. CloudFront's second category of use cases involves handling simple HTTP(S) request/ response manipulations via short-lived functions. The new CloudFront Functions from AWS offer the performance and speed required to process millions of requests per second. A process-based isolation model combined with specific network and file system access restrictions enables scalability. This is in stark contrast to Lamda@Edge, which relies on virtual machine-based (VM-based) isolation. According to AWS, CloudFront Functions are best-suited for lightweight web request processing, including cache-key manipulations and normalization; URL rewrites and redirects; HTTP header manipulation; access authorization; and more.