# High Performance Web Sites  Author:: Steve Souders ## Highlights > Image and PDF files should not be gzipped because they are already compressed. ([Location 1467](https://readwise.io/to_kindle?action=open&asin=B0028N4WHY&location=1467)) > There is a cost to gzipping: it takes additional CPU cycles on the server to carry out the compression and on the client to decompress the gzipped file. ([Location 1471](https://readwise.io/to_kindle?action=open&asin=B0028N4WHY&location=1471)) --- Title: High Performance Web Sites Author: Steve Souders Tags: readwise, books date: 2024-01-30 --- # High Performance Web Sites  Author:: Steve Souders ## AI-Generated Summary None ## Highlights > Image and PDF files should not be gzipped because they are already compressed. ([Location 1467](https://readwise.io/to_kindle?action=open&asin=B0028N4WHY&location=1467)) > There is a cost to gzipping: it takes additional CPU cycles on the server to carry out the compression and on the client to decompress the gzipped file. ([Location 1471](https://readwise.io/to_kindle?action=open&asin=B0028N4WHY&location=1471))