In this chapter, I touched on two very different topics. First, I looked at responsive user interfaces and how to make them faster and then I continued with the concept of caching. That topic was introduced with a simple example, followed by a fully featured cache implementation that you can use in your programs.
At the end, I returned to the example SlowCode program from Chapter 1, About Performance. First, I used some detective work to find out what it really does, which allowed me to improve it a lot. The code now processes a million numbers in mere milliseconds and not minutes as the original program did.
In the next chapter, I'll focus on optimizing the code on a smaller level. We will look at various Delphi language and RTL elements and you'll learn which parts of the language and system libraries can behave slower than one would expect and what you can do to improve that.