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Dynamic function loading (DFL) is the ability to specify the default routines that are compiled and loaded into memory when a program is launched. Because many applications contain features that may not be used, DFL's ability to select only dependent programs increases the speed of a program's initial opening time.
DFL is also known as lazy loading.
Applications usually have a number of features, many of which are used frequently. Other features may be used rarely or only in certain cases.
The DFL technique specifies that the system loader will load only the necessary components of a program that are always or usually needed. Thus, this technique is geared toward improving program performance.
Denoting program components that load into memory during program launch, like modules or DLLs, depends on the threading process of the software functions. During program launch, some threads are dispensable because a user may need to view an interface prior to running a particular function. Other threads may be delayed until after the initial interface is loaded into memory.
A typical program has more than one interface. When a computer recognizes that a user is not using certain software functions, it may load additional components into memory, which can impact performance during computer hardware overloads.