Figure 9-1. Loading an empty HTML document with 20 images using different numbers of aliases

Chapter 9 - Advanced Web Performance Optimization

Yahoo! found that increasing the number of hostnames to two was optimal (see Figure 9-1).

response time versus number of aliases

Figure 9-1. Loading an empty HTML document with 20 images using different numbers of aliases

Theurer, T., and S. Souders. April 11, 2007. "Performance Research, Part 4: Maximizing Parallel Downloads in the Carpool Lane."
Yahoo! Interface Blog, http://yuiblog.com/blog/2007/04/11/performance-research-part- 4/ (accessed February 11, 2008). Theurer provided the author with an updated figure.