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Additional resources for Web Performance: The Definitive Guide
Also, since we’re using persistent connections in step 2, we might expect that connection times (T1) would be less significant (since connections only need be made once) and the transport time (T3) to be much larger, as a percentage, than in step 1, since the step 2 content often includes images and other byte-heavy content, where the (plain text) base HTML page delivered in step 1 is usually much smaller. At each step, the user’s client requests a different kind of information from a different set of servers located in different places!
462 18 | Chapter 1: What Is Web Performance? 462 seconds). We need to gather several sample measurements to have a good idea of the overall response time. Let’s run the cURL command 10 times and gather the data. We’ll use a shell script to do this. Our script will stop for 1000 milliseconds between tests, based on the assumption that the request won’t take that long! The result should be a list with 10 numbers in it. The script on the companion site will also take care of converting the data values to milliseconds, which is the most common unit of measure for Web re‐ sponse times.
Relative levels of impact on E2E response times in each step of the MPPC process In the table I’ve tried to indicate the relative impact of each part of the overall cycle. I’ve marked all the deferred loading steps as green, or low impact (since they don’t impact the E2E directly). In step 1, the transport time is usually small, for transporting the base HTML page, but is much larger in step 2, as described previously. There are more qualitative differences between the steps in the MPPC model, as shown in Table 3.