This document summarizes a presentation about optimizing server-side performance. It discusses measuring performance metrics like time to first byte, optimizing databases through techniques like adding indexes and reducing joins, using caching with Memcached and APC, choosing fast web servers like Nginx and Lighttpd, and using load testing tools like JMeter to test performance before deployment. The presentation was given by a senior engineer at Wayfair to discuss their experiences optimizing their platform.