When the algorithm is as perfect as it can get, and the program is still not running fast enough, it is time to fine-tune the code. In a process we call optimization, we can change the Delphi code so that it will execute in less time, or we can convert it to assembler code. The latter option should be used sparingly, as assembler code is hard to maintain; it also prevents us from compiling to multiple platforms. The last option, which I discussed in Chapter 8, Using External Libraries, is to replace the code with an external library.

As a first step in fine-tuning the code, you should always check the compiler settings. The most important setting is probably Optimization, which can sometimes make a big difference. My recommendation, however, is to disable optimization in the DEBUG version and enable it for RELEASE. Disabling optimization can make a big improvement in the debugging experience.

Another setting that makes a big difference is Range checking. Disabling range...