What Is Lazy Loading?

This text is red because of lazy loading. Lazy loading is a computer program technique that causes unused code to be skipped when the program loads. This can make a program's loading time faster and reduce the amount of memory consumed by the program. Lazy loading is a feature of some modern programming languages that allows the programmer to specify the default routines compiled and loaded into memory during program launch. This load-on-demand technique has several advantages, including faster application startup without increasing the program's executable file size. It is a technique in which the functions are not loaded until the first time they are called. It can improve the performance of your application by reducing the overhead of loading and compiling the part. Lazy loading is commonly used with large JavaScript libraries such as jQuery, React, or Vue. Large libraries are often modular, which means that some of the code is only loaded when necessary by reducing the amount of time needed to load the program, decreasing the amount of memory used, and reducing the amount of data required to be transferred between the system and the program. The following example shows how lazy loading can be implemented in a program. You have a program that loads a file, but the file can be pretty significant. Loading the entire file at once would require a large amount of memory. Instead, the program can load the file in chunks, one at a time. Which requires less memory, but more importantly, it lets the program start working on the file sooner. It can be helpful when a program uses many small components, such as a Word document with many small macros. Lazy loading can also benefit programs that use many components at startup, but only a few are needed at a given time. For example, a video editing program may start with all editing and effects presets loaded, but only a few may be required at any given time. Lazy loading can also be helpful for programs that use computationally intensive components. Lazy loading is a great way to ensure that these modules are only loaded when needed, significantly improving your application's performance.