July 2026
Intermediate to advanced
396 pages
11h 2m
English
Content preview from Full Stack Testing, 2nd Edition
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Chapter 8. Performance Testing
Time is money!
Benjamin Franklin
We’ve all been frustrated when our favorite websites suddenly become slow as sloths, leaving us wondering, “Is there a problem with my internet?” To save your application’s end users from such frustrations, you have to continuously measure and work to improve web performance. This chapter covers performance KPIs, API performance testing, frontend performance testing, and new AI capabilities to assist with both API and frontend performance testing and shift-left performance testing. You will also get a chance to try both frontend and API performance testing in the exercises.
Because performance testing is such a large topic and must be done both on the backend and the frontend, this chapter is structured a little differently from the previous ones. You’ll find all the familiar sections here, but split into two halves: first backend, including exercises and additional tools, and then frontend. A holistic strategy for shift-left performance testing is presented toward the end of the chapter.
Backend Performance Testing Building Blocks
How much can a few seconds’ delay really matter? There is a quantitative indicator for this: the bounce rate is the percentage of customers that leave a website after viewing just one page. A Google study found a strong (see Table 8-1) correlation between page load time and user bounce rates. The data confirms that with every additional second’s delay, businesses lose customers to their ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.