Issue link: https://read.uberflip.com/i/1146286
108 | Chapter 15: Deconstructing 10 Top Sites Even with the performance improvements identified by YSlow, the sheer number of images in the page (74) is a challenge. Nineteen of these images are used as back- grounds in CSS rules. Converting them into CSS sprites would reduce the total HTTP requests from 84 to 66. Looking at the subset of HTTP requests shown in the waterfall chart in Figure 15-5, we see that because these images are all requested from the same hostname, only two images are downloaded in parallel, increasing the total page load time. Splitting this large number of images across two hostnames would double the amount of parallel downloads, significantly reducing the end user response time. Two is the number of hostnames recommended in Chapter 6 in the "Parallel Downloads" section.